| BRIDGESTONE SPORTS CO., LTD. Patent applications |
| Patent application number | Title | Published |
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| 20120035002 | COLORED GOLF BALL - In a colored golf ball having a core, a cover of at least one layer encasing the core and a coat of paint applied to a surface of an outermost layer of the cover, the outermost cover layer is formed of a resin composition which includes (a) a thermoplastic resin, (b) a color pigment or dye, (c) titanium oxide, and (d) a lubricant. The resin composition has a total light transmittance of at least 1.0 but not more than 40, and a diffuse transmittance of at least 1.0 but not more than 40. The paint coat contains a polarizing pigment. The ball has an excellent visibility and stylishness and, in spite of being pastel-colored, is endowed with an appearance that is lustrous and elegant. | 02-09-2012 |
| 20120029130 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material which is a resin mixture composed of (a) a nonionic olefin-unsaturated carboxylic acid copolymer and/or olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer, (b) a nonionic olefin-unsaturated carboxylic acid copolymer and/or olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer, (c) an organic acid or a metal salt thereof, (d) a basic inorganic metal compound for neutralizing at least 70 mol % of acid groups in components (a) to (c), and (e) a spherical inorganic filler, which resin mixture has a Shore D hardness of from 40 to 60. The golf ball material of the invention provides an excellent rebound resilience and durability while maintaining the flow properties essential for injection molding. | 02-02-2012 |
| 20120015760 | RUBBER COMPOSITION FOR GOLF BALL AND GOLF BALL - The invention provides a rubber composition for golf balls which includes a base rubber, (B) a metal salt of an unsaturated carboxylic acid and/or an unsaturated carboxylic acid and zinc oxide, (C) an organic peroxide, and (D) from 0.1 to 5 parts by weight of a metal salt of a thiol having the general formula (R—S) | 01-19-2012 |
| 20120010347 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - A golf ball material composed of (A) an olefin-containing thermoplastic polymer having an acid content of at least 0.5 wt % but less than 5.0 wt %, (B) a resin composition which includes one or more selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and (C) an oxygen-containing inorganic metal compound has a good thermal stability, flow and processability, making it suitable for injection molding. The golf ball material is ideal for the production of high-performance golf balls endowed with durability, scuff resistance and optimal hardness without a loss of rebound in the molded article. | 01-12-2012 |
| 20120010026 | GOLF BALL - A golf ball includes a plurality of circular dimples formed on the surface thereof, each of the circular dimples having a flat bottom surface; and a plurality of noncircular dimples formed on the surface of the golf ball, at least about 10 percent of dimples of all the dimples on the surface being the noncircular dimples, wherein a boundary line between a land part of the golf ball and the noncircular dimples each comprise a curved line part and a straight line part. The plurality of noncircular dimples each having a flat bottom surface. The bottom surface of the noncircular dimple may has a planar shape approximately similar to the boundary line. The lift coefficient CL at Re 70000/2000 rpm may be at least about 70 percent of the lift coefficient CL at Re 80000/2000 rpm, and the drag coefficient CD at Re 180000/2520 rpm is up to about 0.225. | 01-12-2012 |
| 20120004049 | GOLF CLUB HEAD - A golf head club has a high moment of inertia and thus produces a pleasing hitting sound. A metallic golf club head | 01-05-2012 |
| 20110319190 | GOLF CLUB HEAD - A golf club head has a face portion with a thick-walled portion located in the center of the face portion and an outer peripheral portion located on an outer periphery of the thick-walled portion. The thick-walled portion has a central portion of the face portion having a largest thickness, a first ridge which surrounds the central portion and has a smaller thickness than the central portion, and a first valley which is located between the central portion and the first ridge and has a smaller thickness than the first ridge. The golf club head maintains a low weight of a face portion and suppresses dispersion of CT values at each hitting point so that the CT values at hitting points other than a sweet spot are substantially equal to the CT value at the sweet spot. | 12-29-2011 |
| 20110319189 | PUTTER HEAD - A putter head includes a head main body having a depressed portion and a face insert disposed within the depressed portion so that the face insert is mounted in a face surface of the head main body. The face insert includes at least one low hardness portion and at least one high hardness portion. The face insert has a boundary face between the at least one low hardness portion and the at least one high hardness portion which is inclined relative to a back-to-forth direction of the putter head. The boundary face may decline toward the rear or may rise toward the rear. The face insert may comprise a plurality of the low hardness portions and a plurality of the high hardness portions so that the low and high hardness portions are arranged vertically in multiple layers. The sectional shapes taken perpendicularly to the back-to-forth direction of the high hardness portion and the low hardness portion may be substantially of a right triangle. The face insert may comprise a surface layer and groove portions on a front face thereof. | 12-29-2011 |
| 20110319188 | PUTTER HEAD - A putter head has a head main body and a face insert mounted on a face surface of the head main body. The face insert has a slit which is cut in from an end face on a sole or top side of the face insert toward an opposite side thereof. In one embodiment, the slit is cut in from an end face on the sole side of the face insert toward the top side thereof. The slit may be extended obliquely such that the top side of the slit is located forward of the face insert. In another embodiment, the slit is cut in from the side face on the top side of the face insert toward the sole side thereof. The slit may be extended obliquely such that the sole side of the slit is located rearward of the putter head. Any slit may be extended from the side face on a toe side of the face insert to the side face on a heel side thereof. The face inserts may contain viscoelastic material loaded in the slit. | 12-29-2011 |
| 20110312440 | GOLF CLUB HEAD - A hollow golf club head according to this invention includes a face portion, a crown portion, and a sole/side portion including a sole portion and a side portion. The sole/side portion includes a thin region formed to traverse at least the sole portion from the toe side to the heel side, and thick regions formed on the side of the face portion and the back side, respectively, with respect to the thin region to be adjacent to the thin region. The golf club head further includes a rib which extends from the toe side to the heel side only in the thin region of the thin region and the thick region, and is connected to the side portion on the toe side and the side portion on the heel side. | 12-22-2011 |
| 20110300972 | GOLF BALL - A golf ball has plural dimples provided on a surface of the golf ball; a first land part existing between the plural dimples and having as its surface a spherical surface of a sphere having the center of the golf ball as its center; a second land part having a boundary with the first land part or boundaries with the first land part and the plural dimples and having a surface having a smaller curvature than the spherical surface of the first land part; and an engraved marking disposed substantially on the second land part. | 12-08-2011 |
| 20110300971 | GOLF BALL - A golf ball includes a land part representing a symbol, and dimples defining the land part by outer edges thereof and disposed on a surface of the golf ball. The symbol represented by the land part may include numerals, letters, pictures, or logo. The dimples defining the land part by outer edges thereof can include at least two non-circular dimples. The dimples defining the land part by outer edges thereof can include a dimple having a wall surface having a linear shape extending substantially in a depth direction, the wall surfaces being adjacent to the land part representing the symbol. | 12-08-2011 |
| 20110300967 | GOLF CLUB HEAD - This invention provides a golf club head including a plurality of parallel scorelines formed in its face surface, and a plurality of grooves which are formed in the face surface and have a width narrower than the scorelines. Rounded portions are formed on the edges of the scorelines. The plurality of grooves are formed at positions on the two sides of each of the scorelines to extend parallel to the scorelines. | 12-08-2011 |
| 20110294596 | GOLF CLUB HEAD PROCESSING METHOD AND GOLF CLUB HEAD - This invention provides a golf club head processing method of performing blast processing on a face surface on which a scoreline is formed. The processing method according to this invention includes the steps of filling the scoreline with a masking material before the blast processing, and removing the masking material from the scoreline after the blast processing. | 12-01-2011 |
| 20110287869 | GOLF BALL - The invention provides a golf ball having a solid core, a cover of at least one layer, and a plurality of dimples on a surface of an outermost layer of the cover. The dimples number at least 250 but not more than 500, and have a volume ratio (VR) of from 1.00 to 1.40%. The ball has a deflection, when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf), of from 4.0 to 6.0 mm, and has an initial velocity, as measured using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument, of from 70.0 to 76.0 m/s. This golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 11-24-2011 |
| 20110287868 | GOLF BALL - The invention provides a golf ball having a solid core, a cover of at least one layer, and a plurality of dimples on a surface of an outermost layer of the cover. The dimples number at least 250 but not more than 500, and have a volume ratio (VR) of from 1.20 to 1.50%. The ball has a deflection, when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf), of from 4.0 to 6.0 mm. This golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 11-24-2011 |
| 20110287867 | GOLF BALL - The invention provides a golf ball having a solid core, a cover of at least one layer, and a plurality of dimples on a surface of an outermost layer of the cover. The dimples have a volume ratio (VR) of at least 1.6%. The ball has an initial velocity, as measured using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument, which is at least 77 m/s, and has a ratio of total distance traveled when struck at a head speed of 54 m/s to total distance traveled when struck at a head speed of 35 m/s (HS54/HS35) of from 1.30 to 1.50. This golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 11-24-2011 |
| 20110287864 | GOLF BALL - The invention provides a golf ball having a solid core, a cover of at least one layer, and a plurality of dimples on a surface of an outermost layer of the cover. The dimples number at least 250 but not more than 500, and have a volume ratio (VR) of from 1.20 to 1.60%. The outermost cover layer has a surface hardness, expressed as the Shore D hardness, of from 58 to 75. The ball has a deflection, when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf), of from 4.0 to 6.0 mm. This golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 11-24-2011 |
| 20110287863 | GOLF BALL - The invention provides a golf ball having a solid core, a cover of at least one layer, and a plurality of dimples on a surface of an outermost layer of the cover. The dimples have a volume ratio (VR) of from 1.0 to 1.4%. The ball has an initial velocity, as measured using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument, of from 75.5 to 77.7 m/s, and a ratio of total distance traveled when struck at a head speed of 54 m/s to total distance traveled when struck at a head speed of 35 m/s (HS54/HS35) of from 1.30 to 1.50. This golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 11-24-2011 |
| 20110287862 | GOLF BALL - The invention provides a golf ball having a solid core, a cover of at least one layer, and a plurality of dimples on a surface of an outermost layer of the cover. The dimples have a volume ratio (VR) of at least 1.0 but less than 1.6%. The ball has a deflection, when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf), of from 4.0 to 6.0 mm, an initial velocity, as measured using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument, which is greater than 77.7 m/s but not more than 82 m/s, and a ratio of total distance traveled when struck at a head speed of 54 m/s to total distance traveled when struck at a head speed of 35 m/s (HS54/HS35) of from 1.30 to 1.50. This golf ball is able to achieve a superior distance when struck at a low head speed and on shots with an iron. | 11-24-2011 |
| 20110287853 | GOLF CLUB - A golf club includes: a shaft; a head including a hosel formed with a hosel hole; a shaft case with a substantially tube shape being bonded to a leading end of the shaft, the shaft case being inserted into the hosel hole, the shaft case being fixed to the hosel by a ring-shaped screw member fitted onto an upper portion of the shaft case and detachably screwed into a female screw in an inner circumferential surface of the hosel hole, wherein an outer side surface of a lower side part of the shaft case and a lower side part of the hosel hole have non-circular cross-section shapes. | 11-24-2011 |
| 20110281669 | GOLF BALL - The invention provides a golf ball having a core and one or more cover layer encasing the core, wherein at least one cover layer is formed by injection-molding a single resin composition of primarily (A) a thermoplastic polyurethane and (B) a polyisocyanate compound, and at least some polyisocyanate compound in which all the isocyanate groups on the molecule remain in an unreacted state is present in the resin composition. The golf ball has a high rebound, an excellent spin performance and an excellent scuff resistance, and the cover layer-forming resin composition has excellent flow properties and an excellent cover layer manufacturability. | 11-17-2011 |
| 20110269568 | GOLF CLUB HEAD - This invention provides a golf club head in which a plurality of scorelines are formed in its face surface at an equal pitch. Rounded portions are formed on the edges of the scorelines. Each region between adjacent scorelines includes a fine groove formation region in which N (N≧2) fine grooves are formed to extend parallel to the scorelines and to align themselves in a direction perpendicular to the scorelines at an interval d (d≧0). Letting S be the distance between the endpoints of the rounded portions of the adjacent scorelines, Wt be the sum total of the widths of all the fine grooves, A1 be the distance from the endpoint of the rounded portion of one scoreline of the adjacent scorelines to the fine groove formation region, A2 be the distance from the endpoint of the rounded portion of the other scoreline of the adjacent scorelines to the fine groove formation region, and Wmax be the maximum width of the widths of the fine grooves, 0≦A1+A2| 11-03-2011 | |
| 20110269567 | GOLF CLUB HEAD - This invention provides a golf club head in which a plurality of scorelines are formed in its face surface. The golf club head includes a first fine groove formed in the face surface to extend parallel to the scorelines, and a second fine groove formed in the face surface to intersect with the first fine groove. | 11-03-2011 |
| 20110263348 | GOLF CLUB - A golf club includes: a shaft case being inserted into a hosel from the upper end side of a hosel hole in a head; an extending member with a lower end side which is screwed into the upper end side of the hosel hole, into which the screw member is screwed; and a pair of attachments which is fit onto the shaft and interposed between an upper end surface of the shaft case and a lower end surface of the screw member and each of which has a half-split cylindrical shape, wherein: the shaft case is fixed to the hosel hole by the screw member pressing the shaft via the attachments; and the shaft case is fixable to the hosel hole by removing the extending member and the attachments and screwing the screw member onto the upper end side of the hosel hole. | 10-27-2011 |
| 20110257945 | GOLF BALL TRAJECTORY SIMULATION METHOD - The invention is directed at a golf ball trajectory simulation method which sets up a golf ball model within a virtual airflow space where a grid has been generated, sets a weight for the ball model and applies initial conditions (initial velocity, launch angle, spin rate) to the ball model so as to cause the model to fly within the virtual airflow space, then calculates the lift coefficient and the drag coefficient for the golf ball from the air stream velocity, direction and pressure calculated in each grid cell, and calculates the flight distance and left-to-right dispersion for the golf ball from launch until landing by calculating the change in height, change in lateral direction, change in velocity and change in spin rate for the golf ball during flight. The trajectory simulation method divides the flight path of the golf ball model into two or three regions based on the criteria that Re=250,000 to 170,000 is a high-velocity region, Re=170,000 to 100,000 is a medium-velocity region and Re=100,000 and below is a low-velocity region, and sets up a height for the grid adjacent to the golf ball model surface in the high-velocity region (grid height A), a height for the grid adjacent to the golf ball model surface in the medium-velocity region (grid height B) and a height for the grid adjacent to the golf ball model surface in the low-velocity region (grid height B) such that grid height A| 10-20-2011 | |
| 20110256959 | IRON GOLF CLUB HEAD - A golf club head ( | 10-20-2011 |
| 20110256952 | GOLF CLUB, SHAFT REPLACING METHOD AND HEAD REPLACING METHOD - A method for replacing a shaft of a golf club, the golf club including: a head having a hosel; the shaft; a shaft case fixed to one end of the shaft, and configured to be inserted into the hosel; and a ring-shaped screw member configured to be screwed into one end of the hosel to fix the shaft case in the hosel, and to be fitted with an outer face of an one end of the shaft case, the ring-shaped screw member being noncontact with the shaft, the method comprising: fixing a newly-provided shaft to a newly-provided shaft case corresponding to the hosel; unscrewing the ring-shaped screw member from the hosel; removing the shaft case with the shaft from the hosel; inserting the newly-provided shaft case with the newly-provided shaft to the hosel; and screwing the ring shaped screw member on the hosel. | 10-20-2011 |
| 20110256944 | GOLF BALL TRAJECTORY SIMULATION METHOD - The invention is directed at a golf ball trajectory simulation method which sets up a golf ball model within a virtual airflow space where a grid has been generated, sets a weight for the ball model and applies initial conditions (initial velocity, launch angle, spin rate) to the ball model so as to cause the model to fly within the virtual airflow space, then calculates the lift coefficient and the drag coefficient for the golf ball from the air stream velocity, direction and pressure calculated in each grid cell, and calculates the flight distance and left-to-right dispersion for the golf ball from launch until landing by calculating, at predetermined short time intervals, the change in height, change in lateral direction, change in velocity and change in spin rate for the golf ball during flight. The trajectory simulation method divides the flight path of the golf ball model into two or three regions based on the criteria that Re=250,000 to 170,000 is a high-velocity region, Re=170,000 to 100,000 is a medium-velocity region and Re=100,000 and below is a low-velocity region, and sets up short time intervals Δta in the high-velocity region, short time intervals Δtb in the medium-velocity region and short time intervals Δtc in the low-velocity region such that Δta>Δtb>Δtc. | 10-20-2011 |
| 20110250989 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, an inner cover layer and an outer cover layer, which outer cover layer has a plurality of dimples on a surface thereof. The inner cover layer has a thickness of from 0.8 to 3.0 mm and a material hardness (Shore D) of from 50 to 80, the outer cover layer has a material hardness (Shore D) of from 35 to 60, and the material hardness (Shore D) of the inner cover layer is higher than the material hardness (Shore D) of the outer cover layer. The dimples number at least 250 and not more than 500, have a surface coverage (SR) of at least 70% and a volume ratio (VR) of at least 1.0%, are of at least three types of mutually differing dimple diameter (DM) and/or dimple depth (DP), and have an average depth of at least about 0.18 mm and a diameter-to-depth ratio (DM/DP) of not more than about 23. The ball has a coefficient of lift CL at a Reynolds number of 70,000 and a spin rate of 2,000 rpm which is maintained at 60% or more of the coefficient of lift CL at a Reynolds number of 80,000 and a spin rate of 2,000. This multi-piece solid golf ball is able to substantially reduce the distance traveled by the ball when struck at a high HS, while at the same time holding down the reduction in distance when struck at a low HS. | 10-13-2011 |
| 20110250988 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, an inner cover layer and an outer cover layer, which outer cover layer has a plurality of dimples on a surface thereof. The inner cover layer has a thickness of from 0.8 to 3.0 mm and a material hardness (Shore D) of from 10 to 60, the outer cover layer has a thickness of from 0.7 to 3.0 mm and a material hardness (Shore D) of from 45 to 62, and the material hardness (Shore D) of the outer cover layer is higher than the material hardness (Shore D) of the inner cover layer. The dimples number at least 250 and not more than 500, have a surface coverage (SR) of at least 70% and a volume ratio (VR) of at least 1.0%, are of at least three types of mutually differing dimple diameter (DM) and/or dimple depth (DP), and have an average depth of at least about 0.18 mm and a diameter-to-depth ratio (DM/DP) of not more than about 23. The ball has a coefficient of lift CL at a Reynolds number of 70,000 and a spin rate of 2,000 rpm which is maintained at 60% or more of the coefficient of lift CL at a Reynolds number of 80,000 and a spin rate of 2,000. This multi-piece solid golf ball is able to substantially reduce the distance traveled by the ball when struck at a high HS, while at the same time holding down the reduction in distance when struck at a low HS. | 10-13-2011 |
| 20110250987 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, an inner cover layer and an outer cover layer, which outer cover layer has a plurality of dimples on a surface thereof. The value obtained by subtracting a material hardness (Shore D) of the outer cover layer from a material hardness (Shore D) of the inner cover layer is greater than −5 and less than +5. The dimples number at least 250 and not more than 500, have a surface coverage (SR) of at least 70% and a volume ratio (VR) of at least 1.0%, are of at least three types of mutually differing dimple diameter (DM) and/or dimple depth (DP), and have an average depth of at least about 0.18 mm and a diameter-to-depth ratio (DM/DP) of not more than about 23. The ball has a coefficient of lift CL at a Reynolds number of 70,000 and a spin rate of 2,000 rpm which is maintained at 60% or more of the coefficient of lift CL at a Reynolds number of 80,000 and a spin rate of 2,000. This multi-piece solid golf ball is able to substantially reduce the distance traveled by the ball when struck at a high HS, while at the same time holding down the reduction in distance when struck at a low HS. | 10-13-2011 |
| 20110250984 | GOLF CLUB AND METHOD OF ADJUSTING PROPERTIES THEREOF - A golf club includes: a hosel of a head to which a leading end of a shaft is attached; a weight material for adjusting weight being provided in a lower end portion of a hosel hole; and a communication opening which communicates the lower end portion of the hosel hole with an inside of the head, wherein the weight material is detachably screwed into the communication opening. | 10-13-2011 |
| 20110232062 | GOLF CLUB AND SHAFT REPLACING METHOD - According to an aspect of the invention, a golf club includes: a golf club head having a hosel; a shaft; a shaft case fixed to one end of the shaft, and inserted into the hosel, the shaft case being formed in a substantially cylindrical shape; and a ring-shaped screw member screwed into one end of the hosel to fix the shaft case in the hosel, the ring-shaped screw member being detachable from the hosel; | 09-29-2011 |
| 20110212266 | GOLF BALL MANUFACTURING METHOD - The invention provides a method of manufacturing golf balls having a core and at least one cover layer which involves injecting a molten cover resin material around a core so as to form a cover layer. The cover resin material is a single resin composition made up of (A) a thermoplastic polyurethane, (B) a polyisocyanate compound and (C) a thermoplastic elastomer other than the thermoplastic polyurethane in a weight ratio (A):(B):(C)=100:{2-50}:{0-50}, and is injected with from 10 to 99% of the total number of isocyanate groups in component B remaining in an unreacted state within the cover resin material. The method of the invention provides a high manufacturability and a good amenability to mass production, and the manufactured gold balls thus obtained have a high rebound and excellent scuff resistance. | 09-01-2011 |
| 20110207555 | MULTIPLE-PIECE GOLF BALL - A multiple-piece golf ball includes a core positioned at the center of the golf ball; an intermediate layer surrounding the core; a cover further surrounding the intermediate layer; at least one high specific gravity member having a higher specific gravity than the core, the intermediate layer and the cover. The at least one high specific gravity member is arranged such that a moment of inertia of the golf ball with respect to an x-axis Ix and a moment of inertia of the golf ball with respect to a y-axis Iy are substantially the same, a moment of inertia of the golf ball with respect to a z-axis Iz is smaller than Ix and Iy, and the difference between Iz and Ix or Iy is at least approximately 3. The x-axis, y-axis, and z-axis intersect orthogonally at the center of the golf ball. | 08-25-2011 |
| 20110207554 | MULTIPLE-PIECE GOLF BALL - A multiple-piece golf ball includes a core positioned at the center of the golf ball; an intermediate layer surrounding the core; a cover further surrounding the intermediate layer; at least one high specific gravity member having a higher specific gravity than the core, the intermediate layer and the cover. The at least one high specific gravity member is arranged such that a moment of inertia of the golf ball with respect to an x-axis Ix and a moment of inertia of the golf ball with respect to a y-axis Iy are substantially the same, a moment of inertia of the golf ball with respect to a z-axis Iz is greater than Ix and Iy, and the difference between Iz and Ix or Iy is at least approximately 3. The x-axis, y-axis, and z-axis intersect orthogonally at the center of the golf ball. | 08-25-2011 |
| 20110201453 | GOLF BALL - The invention provides a golf ball having a core, at least one intermediate layer encasing the core, and a cover. The intermediate layer is formed primarily of a specific ionomer resin composition that is highly neutralized. The cover is formed by injection molding a single resin blend composed primarily of a thermoplastic polyurethane and (g) a polyisocyanate compound in at least some portion of which all the isocyanate groups on the molecule are present in an unreacted state. The golf ball of the invention has a low spin rate on shots with a driver, enabling it to travel a good distance, and achieves a sufficient spin rate on shots with a short iron such as a wedge. The ball also has an excellent scuff resistance. | 08-18-2011 |
| 20110201451 | GOLF CLUB HEAD - A face portion of a golf club head includes first to fourth main ribs on an inner surface of the head. The first main rib extends from a center portion of the face portion toward a crown, and the second main rib extends from the center portion toward a sole. The face portion is formed to have such a thickness that the center portion, the first main rib, and the second main rib become thinner in this order. The third and fourth main ribs extend from the center portion in outward directions of the face portion. | 08-18-2011 |
| 20110177888 | GOLF BALL - The present invention provides a golf ball composed of a core and a cover having an outside surface on which are formed a plurality of dimples. Letting BV and CV be the initial velocity (m/s) of, respectively, the ball and the core as measured by a method using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument and letting BE and CE be the deflection (mm) of, respectively, the ball and the core when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf), the core initial velocity CV is from 70.0 to 78.0 m/s and the ball satisfies the formula −1.0≦(BV/BE)−(CV/CE)≦3.0. The golf ball of the invention has a flight distance that can be reduced compared with official golf balls currently in use, yet has the same good feel on impact and excellent controllability, scuff resistance and durability to repeated impact as a game ball. | 07-21-2011 |
| 20110172032 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of two or more layers, which solid core has an inner core layer and an outer core layer, and cover has an inner cover layer and an outer cover layer. The inner core layer is formed primarily of a thermoplastic resin, has a diameter of from 21 to 38 mm, has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section obtained by cutting the inner core layer in half, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. And, the inner cover layer has the specific thickness and Shore D hardness, and the outer cover layer has the specific thickness and Shore D hardness, which is higher than that of the inner cover layer. Such a golf ball is able to achieve an increased distance. | 07-14-2011 |
| 20110172031 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of two or more layers, which solid core has an inner core layer and an outer core layer, and cover has an inner cover layer and an outer cover layer. The inner core layer is formed primarily of a thermoplastic resin, has a diameter of from 21 to 38 mm, has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section obtained by cutting the inner core layer in half, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. And, the difference in Shore D hardness between the inner cover layer and the outer cover layer is within ±5. Such a golf ball is able to achieve an increased distance. | 07-14-2011 |
| 20110172030 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of one or more layer, which solid core has an inner core layer and an outer core layer. The inner core layer is formed primarily of a thermoplastic resin, has a diameter of from 21 to 38 mm, has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section obtained by cutting the inner core layer in half, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. Such a golf ball is able to achieve an increased distance. | 07-14-2011 |
| 20110172029 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of two or more layers, which solid core has an inner core layer and an outer core layer, and cover has an inner cover layer and an outer cover layer. The inner core layer is formed primarily of a thermoplastic resin, has a diameter of from 21 to 38 mm, has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section obtained by cutting the inner core layer in half, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. And, the inner cover layer has the specific thickness and Shore D hardness and the outer cover layer has the specific Shore D hardness, which is lower than that of the inner cover layer. Such a golf ball is able to achieve an increased distance. | 07-14-2011 |
| 20110172028 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of one or more layer, which solid core has an inner core layer and an outer core layer. The inner core layer is formed primarily of a thermoplastic resin, has a diameter of from 21 to 38 mm, has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section obtained by cutting the inner core layer in half, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. Such a golf ball is able to achieve an increased distance. | 07-14-2011 |
| 20110172025 | GOLF CLUB SHAFT AND GOLF CLUB - A golf club shaft includes an outer shaft and an inner shaft disposed in a hollow portion of the outer shaft. A void portion is formed between the outer shaft and the inner shaft. The golf club shaft has a double structure including the outer shaft and the inner shaft. This allows both of the shafts to integrally operate and also allows one of the shafts to primarily operate. | 07-14-2011 |
| 20110160002 | GOLF BALL MOLD, GOLF BALL AND GOLF BALL MANUFACTURING METHOD - The invention provides a golf ball mold that is composed of a plurality of mold parts which removably mate to form a cavity having an inner wall with a plurality of dimple-forming protrusions thereon, wherein a non-circular resin injection port for injecting into the cavity a resin material is formed between a plurality of mutually adjoining dimple-forming protrusions which include a plurality of dimple-forming protrusions that lie across a parting line of the mold. Also provided is a golf ball molded using such a mold, and a golf ball manufacturing method which uses such a mold. | 06-30-2011 |
| 20110160001 | MULTI-PIECE GOLF BALL - A multiple-piece golf ball includes a solid core having a specific gravity from about 1.2 to about 14; and a cover disposed on the outside of the solid core, wherein a spin decay rate of the golf ball during flight is from about 3.1% to about 20% of an initial spin rate of the golf ball from about 2800 to about 3500 rpm; and wherein a moment of inertia of the golf ball with respect to an x-axis Ix, a moment of inertia of the golf ball with respect to a y-axis Iy, and a moment of inertia of the golf ball with respect to a z-axis Iz are substantially the same, the x-axis, y-axis, and z-axis intersecting orthogonally at the center of the golf ball. | 06-30-2011 |
| 20110159989 | GOLF BALL MOLD, GOLF BALL AND METHOD OF MANUFACTURING A GOLF BALL - The invention provides a golf ball mold that is composed of a plurality of mold parts which removably mate to form a cavity having an inner wall with a plurality of dimple-forming protrusions thereon, wherein a non-circular resin injection port is formed between a plurality of mutually adjoining dimple-forming protrusions which include dimple-forming protrusions that lie across a parting line of the mold. Also provided is a golf ball molded using such a mold, and a golf ball manufacturing method which uses such a mold. | 06-30-2011 |
| 20110159988 | MOLD FOR FORMING GOLF BALL, METHOD TO MANUFACTURE GOLF BALL WITH SAME, AND GOLF BALL MANUFACTURED USING THE SAME - A golf ball that, in the process of spherical grinding after forming, can maintain the dimple shape and achieve the designed dimple surface occupation ratio. A mold for forming a golf ball of the present invention has at least two body parts, a cavity being formed within the mold by the joining of the at least two body parts, the body part comprising a cavity wall surface which has a spherical surface shape with the center thereof being at the center of the cavity and dimple-forming protrusions provided on the cavity wall surface, the dimple-forming protrusions being connected to the cavity wall surface at an angle of about 60 or more degrees in a region from about 3 μm to about 20 μm from the cavity wall surface. | 06-30-2011 |
| 20110159987 | GOLF CLUB HEAD - A hollow golf club head has a head body having a face aperture part and a face member held to the face aperture part by welding, the face member formed by forging a rolled material of a titanium alloy having an α phase, and the face member comprising a thick-material part positioned in the center of the face member, an outer peripheral part positioned at the periphery of the thick-material part, and a thin-material part partially positioned between the thick-material part and the outer peripheral part. The thick-material part is formed in an area having a shape obtained by depressing a substantially elliptical or substantially circular shape in a substantially arcuate shape toward the center of the ellipse at two opposite sides thereof. The thick-material part, the thin-material part, and the peripheral part are formed by the forging so as to destroy an orientation of the α-phase. | 06-30-2011 |
| 20110159979 | SHAFT SELECTION ASSIST APPARATUS - A shaft selection assist apparatus according to this invention includes a storage means for storing recommended shaft information indicating a correspondence between measurement parameters obtained upon a test strike with a golf club to which a predetermined reference shaft is attached, and recommended shafts among shafts of a plurality of types, an acquisition means for acquiring the measurement results of the measurement parameters associated with a test strike actually made by a user with the golf club, a selection means for selecting a recommended shaft by referring to the recommended shaft information based on the measurement results acquired by the acquisition means, and an output means for outputting information indicating the recommended shaft selected by the selection means. The measurement parameters include the vertical launch angle of a struck ball and the back spin amount on the struck ball. The recommended shaft information stored in the storage means is information which specifies recommended shafts based on the relationship between the shaft rigidity distribution, and the vertical launch angle and the back spin amount. | 06-30-2011 |
| 20110159978 | SHAFT SELECTION ASSIST APPARATUS - A shaft selection assist apparatus according to this invention includes a storage means for storing recommended shaft information indicating a correspondence between measurement parameters obtained upon a test strike with a golf club to which a predetermined reference shaft is attached, and recommended shafts among shafts of a plurality of types, an acquisition means for acquiring the measurement results of the measurement parameters associated with a test strike actually made by a user with the golf club, a selection means for selecting a recommended shaft by referring to the recommended shaft information based on the measurement results acquired by the acquisition means, and an output means for outputting information indicating the recommended shaft selected by the selection means. The recommended shaft information stored in the storage means is information which specifies recommended shafts based on the relationship between the shaft rigidity distribution and the measurement parameters. | 06-30-2011 |
| 20110152004 | GOLF CLUB HEAD - A golf club head includes: a face portion; a sole portion; a side portion; a crown portion defining a hollow portion with the face portion, the sole portion and the side portion; a hosel portion; an adhesive material provided on an inner surface of the hollow portion; and a protruding portion for dividing an arrangement area of the adhesive material, the protruding portion being provided on the sole portion. | 06-23-2011 |
| 20110152002 | METHOD OF MANUFACTURING GOLF CLUB HEAD, GOLF CLUB HEAD, AND HEAD BASE BODY - This invention provides a method of manufacturing a golf club head by processing a head base body having a face base surface which becomes a face surface by finishing. The head base body includes a main body portion having the face base surface, and projecting portions which project from the main body portion. The method includes a finishing step of performing the finishing while the head base body is fixed in position by supporting the projecting portions, and a separation step of separating the projecting portions after the finishing. | 06-23-2011 |
| 20110151999 | GOLF CLUB HEAD AND METHOD OF MANUFACTURING THE SAME - A golf club head according to this invention has scorelines formed in its face surface. A plated layer is formed on at least the face surface of a head base body before the scorelines are formed in the face surface, and the face surface is grooved to form the scorelines in it. | 06-23-2011 |
| 20110151998 | GOLF CLUB HEAD AND METHOD OF MANUFACTURING THE SAME - A golf club head according to this invention has scorelines formed in its face surface. A first plated layer is formed on at least the face surface of a head base body before the scorelines are formed in the face surface, the face surface is grooved to form the scorelines in it, and a second plated layer is formed on the face surface. | 06-23-2011 |
| 20110143862 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball comprising a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples, wherein the core is made primarily of a rubber material and has a diameter of at least 31 mm, the envelope layer and intermediate layer are each made primarily of the same or different resin materials and the cover is made primarily of polyurethane; intermediate layer and cover have an optimized thickness relationship; the core, envelope layer, intermediate layer and cover have optimized hardness relationships; and the core surface and core center have a large hardness difference therebetween. The golf ball has an excellent flight performance and controllability that are acceptable to professionals and other skilled golfers, while also having an excellent durability to cracking on repeated impact and an excellent scuff resistance. | 06-16-2011 |
| 20110143861 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, at least one intermediate layer and a cover. The core has a hardness which gradually increases from a core center to a core surface, with the hardness difference in JIS-C hardness units between the core center and the core surface being at least 15 and, letting (I) be the average value for the cross-sectional hardness at a position 15 mm from the core center and the cross-sectional hardness at the core center and letting (II) be the cross-sectional hardness at a position 7.5 mm from the core center, the hardness difference (I)-(II) in JIS-C hardness units being not more than ±2. The intermediate layer has a material hardness and the core has a surface hardness which together satisfy the condition (JIS-C hardness of intermediate layer material)−(JIS-C hardness of core surface)>0. A sphere composed of the core encased by the intermediate layer has an initial velocity and the core has an initial velocity which together satisfy the condition (initial velocity of sphere composed of core encased by intermediate layer)−(initial velocity of core)≧0. The sphere composed of the core encased by the intermediate layer has a deflection and the core has a deflection which together satisfy the condition 0.80≦(deflection of sphere composed of core encased by intermediate layer)/(deflection of core). The cover is formed primarily of polyurethane, and the cover material has a Shore D hardness and the intermediate layer material has a Shore D hardness which together satisfy the condition (Shore D hardness of cover material)−(Shore D hardness of intermediate layer material)≦0. The golf ball of the invention has an excellent flight performance and feel, a good durability to repeated impact, and an excellent scuff resistance. | 06-16-2011 |
| 20110130219 | MULTI-PIECE SOLID GOLF BALL - A multiple-piece solid core golf ball includes a solid core including an inner core layer and an outer core layer, and a cover disposed on the outside of the solid core. The inner core layer has an outer diameter of at most approximately 25 mm and is formed of a material having a loss tangent (tan δ) of at least approximately 0.1. The outer core layer is formed of a material having a loss tangent (tan δ) of from approximately 0.01 to approximately 0.1. The difference between the loss tangent (tan δ) of the material forming the inner core layer and the loss tangent (tan δ) of the material forming the outer core layer is at least approximately 0.05. | 06-02-2011 |
| 20110130215 | GOLF CLUB HEAD - A hollow golf club head according to this invention includes a face portion, a crown portion, a sole portion, and a side portion. This golf club head includes a head body that forms the crown portion, the sole portion, and the side portion and has an opening portion in a portion corresponding to the face portion, and a face member that is joined to the opening portion and forms the face portion. The head body includes a first notch portion formed in a heel-side portion of the peripheral edge of the opening portion, which is on the side of the crown portion, and a second notch portion formed in a toe-side portion of the peripheral edge, which is on the side of the sole portion. The face member includes a first extending portion that seals the first notch portion, and a second extending portion that seals the second notch portion. The first extending portion is more rigid than a portion of the peripheral edge, which is on the side of the crown portion and on the toe side with respect to the first extending portion. The second extending portion is more rigid than a portion of the peripheral edge, which is on the side of the sole portion and on the heel side with respect to the second extending portion. | 06-02-2011 |
| 20110118398 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material which is a resin mixture composed of (a) a metal-neutralized polymer which is an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 40,000 to 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 3.5 to 8.5, wherein at least 30 mol % of acid groups on the copolymer are neutralized, (b) an organic acid or a metal salt thereof, and (c) a basic inorganic metal compound for neutralizing at least 70 mol % of acid groups in components (a) and (b), which resin mixture has a Shore D hardness of from 30 to 50. The golf ball material of the invention is a low-hardness material. Golf balls in which an injection molding of the golf ball material is used as a cover material have an excellent rebound and durability. | 05-19-2011 |
| 20110118045 | GOLF CLUB HEAD AND GOLF CLUB - A golf club head includes: a head main body formed with a hosel column inserting hole; a hosel column which is formed with a shaft inserting hole and is installed on the hosel column inserting hole; a bolt inserting hole penetrating from a sole side of the head main body to the hosel column inserting hole; and a bolt which is inserted into the bolt inserting hole and is screwed into the hosel column, wherein: the hosel column includes a trunk portion provided with a shaft inserting hole, and a leg portion which protrudes from a lower end surface of the trunk portion and is inserted into the hosel column inserting hole; and at least a lower end side of the leg portion and an inner portion of the hosel column inserting hole are polygonal sectional shape portions and are engaged with each other. | 05-19-2011 |
| 20110118044 | GOLF CLUB HEAD AND GOLF CLUB - A golf club head includes: a head main body having a shaft holder inserting hole; a shaft holder which has a shaft inserting hole and is attachably and detachably installed in the shaft holder inserting hole; a bolt inserting hole which penetrates from a sole side of the head main body to the shaft holder inserting hole; and a bolt which is inserted into the bolt inserting hole, screwed into the shaft holder, and fixes the shaft holder to the head main body, an axis center of the shaft inserting hole and an axis center of the shaft holder inserting hole being non-coaxial shapes, wherein a lower end side of the shaft holder and an inner portion of the shaft holder inserting hole are polygonal sectional shape portions and are engaged with each other. | 05-19-2011 |
| 20110106500 | METHOD FOR DESIGNING GOLF BALL AND GOLF BALL MANUFACTURED BY THE SAME - A method for manufacturing a golf ball includes the step of designing plural dimples on a surface of the golf ball so as to satisfy the following parameters. A total number N of the dimples is approximately 400 or less; a surface roughness Rda of the golf ball is approximately 0.085 mm or less; and a value obtained by dividing an average convex part surface area Srt in the first cross-section and the second cross-section by an average concave part cross-section Sru in the first cross-section and the second cross-section is approximately 0.9 or less. The golf ball surface roughness Rda is the average value of a first golf ball cross-section surface roughness Rp, a second golf ball surface roughness Rm, and a third golf ball surface roughness Rs. The average convex part surface area Srt is the average value of a first convex part surface area Art that, in the first cross-section, is surrounded by the reference spherical surface and the golf ball surface that is higher than the reference spherical surface and a second convex part surface area Art that, in the second cross-section, is surrounded by the reference spherical surface and the golf ball surface that is higher than the reference spherical surface. | 05-05-2011 |
| 20110098132 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core, a cover, at least one intermediate layer situated therebetween, and a plurality of dimples on a surface of the ball. The diameter of the solid core, the deflection of the core when compressed under a final load of 130 kgf from an initial load of 10 kgf, the hardness at the center of the core, the hardness in a region 5 mm to 10 mm from the center of the core, the hardness 15 mm from the center of the core, and the surface hardness are set within specific ranges. The intermediate layer is composed primarily of a material obtained by mixing under applied heat a specific resin composition and the cover is formed primarily of polyurethane. And, the number of dimples and the trajectory volume TVT are set within specific ranges. The golf ball of the invention has an excellent flight performance, feel, controllability and scuff resistance. | 04-28-2011 |
| 20110098131 | GOLF BALL - The invention provides a golf ball having a core, at least one intermediate layer encasing the core, and a cover. The intermediate layer is formed primarily of a specific ionomer resin composition that has been highly neutralized, and the cover is formed primarily of an ionomer resin composition containing a specific amount of a granular inorganic filler. The golf ball has an excellent durability to repeated impact and a good flight performance. | 04-28-2011 |
| 20110092314 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core, a cover, at least one intermediate layer situated therebetween, and a plurality of dimples on a surface of the ball. The diameter of the solid core, the deflection of the core when compressed under a final load of 130 kgf from an initial load of 10 kgf, the hardness at the center of the core, the hardness in a region 5 mm to 10 mm from the center of the core, the hardness 15 mm from the center of the core, and the surface hardness are set within specific ranges. The intermediate layer is composed primarily of a material obtained by mixing under applied heat a specific resin composition. The golf ball of the invention has an excellent flight performance, feel, controllability and scuff resistance. | 04-21-2011 |
| 20110086729 | MOLDED POLYMER MATERIAL AND GOLF BALL - The invention provides a molded polymer material which is obtained by subjecting a polymer composition that includes (A) at least one polymer containing α,β-ethylenically unsaturated carboxylic acid, (B) at least one diene polymer, (C) at least one metal cation source, and (D) at least one organic peroxide, and has a chemical structure arrived at by neutralizing some or all of the carboxyl groups in component A with component C in the presence of component B, to molding and crosslinking under the influence of radicals generated by decomposing component D. The molded polymer material has a high resilience, a high hardness and a good durability, making it well-suited for use in golf balls. | 04-14-2011 |
| 20110086725 | Golf Club Head - The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm. | 04-14-2011 |
| 20110082245 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material which is a resin mixture composed of (a) an olefin-methacrylic acid copolymer and/or an olefin-methacrylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 120,000 to 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 4.0 to 7.0, or a metal neutralization product thereof, (b) an olefin-acrylic acid copolymer and/or an olefin-acrylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 150,000 to 220,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 5.5 to 8.5, or a metal neutralization product thereof, (c) an organic acid or a metal salt thereof, and (d) a basic inorganic metal compound for neutralizing at least 70 mol % of acid groups in components (a) to (c), which resin mixture has a Shore D hardness of from 30 to 60. The golf ball material of the invention is a low-hardness material. Golf balls in which an injection molding of the golf ball material is used as a cover material have an excellent rebound and durability. | 04-07-2011 |
| 20110082244 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material which is a resin mixture composed of (a) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 120,000 to 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 4.3 to 6.6 or a metal neutralization product thereof, (b) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 120,000 to 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 6.8 to 9.5, or a metal neutralization product thereof, (c) an organic acid or a metal salt thereof and (d) a basic inorganic metal compound for neutralizing at least 70 mol % of acid groups in components (a) to (c), which resin mixture has a Shore D hardness of from 30 to 55. The golf ball material of the invention is a low-hardness material. Golf balls in which an injection molding of the golf ball material is used as a cover material have an excellent rebound and durability. | 04-07-2011 |
| 20110082243 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material which is a resin mixture composed of (a) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 40,000 to 80,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 5.0 to 8.0, or a metal neutralization product thereof, (b) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 120,000 to 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 6.0 to 9.5, or a metal neutralization product thereof, (c) an organic acid or a metal salt thereof, and (d) a basic inorganic metal compound for neutralizing at least 70 mol % of acid groups in components (a) to (c), which resin mixture has a Shore D hardness of from 30 to 50. The golf ball material of the invention is a low-hardness material. Golf balls in which an injection molding of the golf ball material is used as a cover material have an excellent rebound and durability. | 04-07-2011 |
| 20110081991 | GOLF BALL - The invention provides a golf ball having a core and a cover of at least one layer that is formed over the core and is made of a resin composition. The ball has a weight change ratio, in a 72-hour accelerated moisture absorption test conducted at a temperature of 40° C. and a relative humidity of 90%, of less than 0.287%. By using in the golf ball a polyurethane having a good resistance to water vapor transmission, the weight change ratio and decrease in initial velocity with use over an extended period of time are held to a minimum, enabling the ball quality to be maintained. | 04-07-2011 |
| 20110081985 | Golf Club Head - The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm. | 04-07-2011 |
| 20110070977 | COLORED GOLF BALL - In a colored golf ball having a core, a cover of at least one layer encasing the core, and a layer of paint applied to a surface of an outermost layer of the cover, the outermost cover layer and/or the paint layer is colored with a fluorescent dye and titanium oxide, and the golf ball itself has a color tone which satisfies specific ranges in the Lab color system. The ball is endowed with an excellent spin performance and durability, an appearance characterized by outstanding visibility, stylishness and elegance, and an excellent weather resistance. | 03-24-2011 |
| 20110070976 | COLORED GOLF BALL - In a colored golf ball having a core, a cover of at least one layer encasing the core, and a layer of paint applied to a surface of an outermost layer of the cover, the outermost cover layer and/or the paint layer is colored with a fluorescent dye, and the golf ball itself has a color tone which satisfies specific ranges in the Lab color system. The ball is endowed with an excellent spin performance and durability, an appearance characterized by outstanding visibility, stylishness and elegance, and an excellent weather resistance. | 03-24-2011 |
| 20110070975 | COLORED GOLF BALL - In a golf ball having a core, a cover of at least one layer encasing the core, and a layer of paint applied to a surface of an outermost layer of the cover, the outermost cover layer and/or the paint layer is colored with a fluorescent pigment, the core or at least one layer of an intermediate spherical body made up of the tore encased by one or more cover layer is colored similar to the color of the fluorescent pigment-colored layer, and the ball itself has a specific color difference ΔE with the color of the core or the intermediate spherical body. The colored golf ball is endowed with an excellent spin performance and durability, an appearance characterized by outstanding visibility, stylishness and elegance, and an excellent weather resistance. | 03-24-2011 |
| 20110070974 | MOLD FOR FORMING GOLF BALL AND GOLF BALL MANUFACTURED USING THE SAME - A mold for forming a golf ball makes it possible to form minute dimples, and to improve mold release properties of the mold and wettability of the mold by a material when a urethane material is used for a cover layer. A mold according to the present invention is a mold for forming a urethane cover as an outermost layer of a golf ball, and includes: at least two split molds that are separably joined with each other, and that includes a cavity formed therein by the joining, the cavity being for forming the urethane cover; protrusions that are formed on a cavity surface of the split molds to form dimples of the golf ball; and a composite plating film that covers the cavity surface of the split molds, that comes into contact with a material of the urethane cover, and that contains a nickel-based matrix and fluororesin particles dispersed in the nickel-based matrix. | 03-24-2011 |
| 20110065529 | METHOD FOR PREPARING GOLF BALL AND GOLF BALL - The present invention provides a method of manufacturing a golf ball having a solid core formed of a rubber composition and a cover of at least one layer encasing the core, which method includes the steps of treating a surface of the core with a solution containing a halogenated isocyanuric acid and/or a metal salt thereof, and covering the treated core with a cover material. The invention also provides a golf ball obtained by such a method. Golf balls obtained by this method have a good feel and a good scuff resistance, and also have a high durability to impact. | 03-17-2011 |
| 20110065526 | GOLF CLUB SHAFT AND GOLF CLUB - A golf club shaft has a function of attenuating the vibration of the shaft at the time of impact and also having a function of stabilizing the struck ball. A shaft has an inner bias layer having a fiber direction that was inclined with respect the shaft axial direction and an outer bias layer having a fiber direction that is inclined with respect to the shaft axial direction in a direction opposite from that of the inner bias layer laminated as a fiber-reinforced resin layer, and a vibration-damping material sheet layer having a vertical-direction length of about 110 mm to about 150 mm disposed between the inner bias layer and the outer bias layer, with region of the position of the end of the grip attachment location as the rear end in the vertical direction. | 03-17-2011 |
| 20110045924 | GOLF BALL - The present invention provides a golf ball composed of a core and a cover having an outside surface on which are formed a plurality of dimples. Letting BV and CV be the initial velocity (m/s) of, respectively, the ball and the core as measured by a method using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument and letting BE and CE be the deflection (mm) of, respectively, the ball and the core when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf), the core initial velocity CV is from 70.0 to 78.0 m/s and the ball satisfies the formula 0≦(CV−BV)−(CE−BE)≦2. The golf ball of the invention has a flight distance that can be reduced compared with official golf balls currently in use, yet has the same good feel on impact and excellent controllability, scuff resistance and durability to repeated impact as a game ball. | 02-24-2011 |
| 20110045923 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of one or more layer, which solid core has an inner core layer and an outer core layer. The inner core layer is formed primarily of a specific, highly neutralized, ionomeric resin composition, has a diameter of from 10 to 38 mm, and has a cross-sectional hardness difference of within ±5 between any two points on a cross-section formed by cutting the inner core layer in half. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 30 to 42 mm. The sum of the hardnesses at the center of the inner core layer and at the surface of the outer core layer is set to a value in a range of from 130 to 170. Such a golf ball is able to achieve an increased distance. | 02-24-2011 |
| 20110040535 | GOLF BALL TRAJECTORY SIMULATION METHOD - The invention is directed at a golf ball trajectory simulation method that employs arithmetic operations executed by a computer to analyze a trajectory of a golf ball having a plurality of dimples on a surface thereof when the ball is launched into flight. The trajectory of the ball is estimated by setting up a golf ball model within a virtual airflow space (field) where a grid has been generated; setting a weight for the golf ball model and applying initial conditions (initial velocity, launch angle, spin rate) to the ball model so as to cause the model to fly within the virtual airflow space (field); calculating a lift coefficient and a drag coefficient for the golf ball from an air stream velocity, direction and pressure calculated in each grid cell; and calculating a flight distance and left-to-right dispersion for the golf ball from launch until landing by calculating a change in height, a change in lateral direction, a change in velocity and a change in spin rate for the golf ball during flight. | 02-17-2011 |
| 20110034262 | WOOD TYPE GOLF CLUB HEAD - A wood type golf club head according to this invention includes a face portion and a crown portion. A center-of-gravity position mark which indicates a point where the center of gravity of the wood type golf club head is projected to the crown portion is formed on the surface of the crown portion. | 02-10-2011 |
| 20110028246 | GOLF BALL - The invention provides a golf ball having a core formed by vulcanizing a rubber composition and a cover composed primarily of a polyurethane material. The rubber composition of the core includes 100 parts by weight of a base rubber, from 10 to 40 parts by weight of an unsaturated carboxylic acid or a metal salt thereof, a peroxyketal (a) and a monophenol-type antioxidant (b), the weight ratio (a)/(b) of the peroxyketal to the monophenol-type antioxidant being from 5 to 50. The ball has an excellent discoloration resistance and an outstanding distance and feel on shots taken with a middle iron. | 02-03-2011 |
| 20110028245 | GOLF BALL - A golf ball has uniform gaps between dimples even if the surface occupancy ratio of the dimples is high, and therefore the aerodynamic performance thereof is improved, whereby a longer flight distance can be obtained. In the golf ball having a plurality of dimples and land parts surrounded by the plurality of dimples, the land part has a shape having at least one vertex, the land part is connected to at least two adjacent land parts substantially by a point, and the area of the land part is in the range of about 0.05 mm | 02-03-2011 |
| 20110028243 | GOLF CLUB HEAD - A golf club head includes a face member having a ball-striking face and an oval thick portion positioned in a central portion of the ball-striking face. The oval thick portion has an oval shape having recesses formed by recessing both sides in a major axis direction in an arc-shaped fashion. The recesses are directed to a toe-side upper portion and a heel-side lower portion. The thickness of the thick portion becomes thickest at a central portion and is gradually reduced from the central portion towards the periphery. The face member is formed such that a portion outside the thick portion is thinner than the thick portion. An occupancy rate of the oval thick portion in the ball-striking face is in a range of 25 to 45%. | 02-03-2011 |
| 20110028236 | IRON GOLF CLUB HEAD - An iron golf club head has a faceplate for hitting a golf ball, the faceplate having a back face; a viscoelastic body fixed onto the back face of the faceplate; and a backplate for sandwiching the viscoelastic body with the faceplate, the backplate having a flange that extends out of the periphery of the viscoelastic body and is fixed onto the back face of the faceplate. | 02-03-2011 |
| 20110028232 | GOLF CLUB - A golf club includes a shaft in which a brightness of a color of the shaft from a grip side toward a head side is changed from darkness to brightness in a plurality of stages. | 02-03-2011 |
| 20110021290 | IRON GOLF CLUB HEAD - An iron golf club head includes: a block that is made by a magnesium alloy; and a metal head main body, wherein the block is embedded into the metal head main body. | 01-27-2011 |
| 20110014995 | GOLF CLUB HEAD - A golf club head according to this invention is a hollow golf club head including a face portion, a crown portion, and a sole portion. The sole portion includes a first region which starts from the boundary portion between the sole portion and the face portion, and a second region which is spaced apart from the boundary portion toward the back side, and is adjacent to the first region. The second region is thinner than the first region and a third region adjacent to the back-side periphery of the second region. The second region includes the position of an antinode of the primary vibration mode of the sole portion at the time of impact. | 01-20-2011 |
| 20100331101 | GOLF CLUB HEAD - A golf club head according to this invention includes a hollow head body, cylindrical body, weight member, and fixing member. The hollow head body has a projection formed along the periphery of the sole, a recess formed inside the projection, and an opening formed in the projection so as to extend from the toe side to the back side. The cylindrical body is provided in the recess of the head body, and includes its one end which engages with the inner wall of the projection on the heel side, and its other end which extends to the vicinity of the opening and can move along the opening. The weight member is retractably, detachably inserted in the cylindrical body. The fixing member is a detachable member which fixes the other end of the cylindrical body onto the projection. | 12-30-2010 |
| 20100324172 | GOLF BALL MATERIAL, GOLF BALL, AND METHOD FOR PREPARING GOLF BALL MATERIAL - The invention provides a golf ball material comprising components (A), (B) and (C): (A) a mixture of different masterbatches prepared by separately masterbatching two or more different metal ions (A1) or a masterbatch prepared by simultaneously masterbatching two or more different metal ions in itself (A2), (B) one or more polymer selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and (C) one or more polymer having an acid content of from about 0.5 to about 30 wt % and selected from the group consisting of olefin-unsaturated carboxylic acid copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester terpolymers, unsaturated carboxylic anhydride-containing polymers, unsaturated dicarboxylic acid-containing polymers and unsaturated dicarboxylic acid half ester-containing polymers. The invention also provides a method for preparing such a golf ball material, and a golf ball made of the material. The golf ball material has a good thermal stability, flow and processability, making it suitable for injection-molding. Moreover, this material is ideal for producing, without any loss of the rebound resilience of golf ball parts molded from the material, high-performance golf balls having excellent durability, scuff resistance and flexibility. | 12-23-2010 |
| 20100323821 | COLOR GOLF BALL - The invention provides a colored golf ball comprising a core, a cover having a plurality of dimples formed on its surface, wherein the golf ball is two-piece structure consisting of a core and a cover, and the surface of the ball is coated with a coating comprising a pearlescent pigment. The ball satisfies the following conditions:
| 12-23-2010 |
| 20100323808 | GOLF CLUB, HEAD OF GOLF CLUB AND METHOD FOR ADJUSTING PROPERTY OF GOLF CLUB - A golf club includes: a head, formed with a hosel insertion hole, including: a female screw, formed in an inner peripheral surface of the entrance portion of the hosel insertion hole; a hosel, formed with a shaft case insertion hole and mounted on a deep portion of the hosel insertion hole; a shaft case, formed with a shaft insertion hole, a leading end portion of the shaft case being mounted into the shaft case insertion hole; a ring holder, fitted with an outer surface of the shaft case; a screw member, fitted with an outer surface of the ring holder in a peripheral direction of the ring holder; and a male screw, formed on an outer peripheral surface of the screw member so that the screw member is engaged with the female screw; and a shaft, inserted into the shaft insertion hole of the head. | 12-23-2010 |
| 20100323055 | GOLF BALL AND GOLF BALL MOLD - The invention provides a golf ball manufactured using a mold having a top half and a bottom half, which ball has formed on a surface thereof, near a seam line corresponding to a parting line between the top and bottom halves of the mold, a recessed and/or raised mark serving as an indicator for detecting the direction or position of the seam line. The invention also provides a golf ball mold composed of a top half and a bottom half that detachably join together so as to form therein a spherical cavity into which a material is injected to mold a golf ball, which mold bears, near a parting line between the top and bottom halves on a wall of the cavity, a raised or recessed feature for forming a mark as an indicator for detecting the direction or position of the parting line. The invention enables the direction and position of the seam line on the surface of the ball to be easily identified and enables the subsequent steps of visually inspecting the ball and applying indicia to the surface of the ball to be carried out more smoothly and advantageously, making it possible in particular to greatly shorten the time devoted to these operations. | 12-23-2010 |
| 20100317464 | GOLF BALL AND METHOD FOR MANUFACTURING THE SAME - A method for manufacturing a golf ball includes the steps of forming the golf ball by using a mold, which mold includes at least two body parts, and is configured so that a cavity is formed within the mold by the joining of the at least two body parts, and in at least one of the body parts, a groove for forming a projecting land part which is ground after the formation of the golf ball is provided in a cavity wall surface near the entire circumference of a parting line formed by the joining; and performing treatment in which the golf ball formed by using the mold is treated so that the color of the entire land part of the golf ball is different from the color of dimples. | 12-16-2010 |
| 20100317459 | GOLF CLUB HEAD - This invention provides a golf club head comprising a plurality of scorelines formed in its face. The golf club head is configured such that an angle θ of the side wall of the scoreline with respect to the face is 70° or less, the edge of the scoreline has a ridged portion projecting from the face, and a height H of the ridged portion from the face satisfies: | 12-16-2010 |
| 20100317454 | GOLF CLUB, HEAD OF GOLF CLUB AND METHOD FOR ADJUSTING PROPERTIES OF GOLF CLUB - A golf club head with a leading end of a shaft mountable thereon, the golf club head includes: a head main body, formed with a hosel insertion hole; a hosel, formed with a shaft case insertion hole and removably mounted in the hosel insertion hole; and a shaft case, formed with a shaft insertion hole and removably mounted in the shaft case insertion hole. | 12-16-2010 |
| 20100316756 | MOLD FOR FORMING GOLF BALL AND GOLF BALL MANUFACTURED USING THE SAME - There are provided a mold for forming a golf ball, which allows a dimple formed near the equator of golf ball corresponding to the partition surface of upper and lower molds to be formed so as to have the same shape as that of a dimple formed in other regions, and a golf ball manufactured using this mold. The mold for forming a golf ball in accordance with the present invention includes at least two body parts, a cavity is formed within the mold by the joining of the at least two body parts, and in at least one of the body parts, a groove for forming a projecting land part which is ground after the formation of the golf ball is provided in a cavity wall surface adjacent to the whole circumference of a parting line formed by the joining. | 12-16-2010 |
| 20100311884 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material for use in an intermediate layer of a multi-piece solid golf ball having a core of at least one layer, at least one intermediate layer encasing the core, and a cover of at least one layer encasing the intermediate layer. The golf ball material is made of a resin composition containing as essential components: (a) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 120,000 to 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from 4.4 to 7.0, or a metal neutralization product thereof; and (b) an organic acid or a metal salt thereof. The golf ball material of the invention enables a highly neutralized ionomer having good flow properties and moldability to be achieved. Golf balls in which an injection molding of the golf ball material is used as the cover material are endowed with an excellent rebound and durability. | 12-09-2010 |
| 20100304889 | GOLF CLUB HEAD - A golf club head having a hollow construction includes a face part having a ball-impacting surface and a first main rib and a second main rib disposed on the inner surface of the face part. The first main rib extends from a crown side to a sole side, and the second main rib extends from a hosel side to a toe-side part of the sole side, the first and second main ribs intersecting each other. The material thickness on a toe side of the face part, with the first main rib being the boundary, is formed so as to be thinner than the material thickness on a heel side of the face part. | 12-02-2010 |
| 20100298070 | TWO-PIECE SOLID GOLF BALL - The invention provides a two-piece solid golf ball having a core and a cover, which ball has a plurality of dimples formed on the surface. The number of dimples is from 250 to 500, the dimples have a surface coverage (SR) of at least 70% and a volume ratio (VR) of at least 1.0%, and dimples of at least three types are used. In addition, the dimples have an average depth of at least about 0.18 mm and a diameter-to-depth ratio (DM/DP) of not more than about 23. The ball has a coefficient of lift CL at a Reynolds number of 70,000 and a spin ratio of 2,000 rpm which is maintained at 60% or more of the coefficient of lift CL at a Reynolds number of 80,000 and a spin rate of 2,000. This two-piece solid golf ball lowers fluctuations in lift and drag at high and low spin rates, enabling a stable trajectory to be achieved. | 11-25-2010 |
| 20100298067 | GOLF BALL - The present invention provides a golf ball having a core, an intermediate layer encasing the core, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The core is formed primarily of a rubber material, and the intermediate layer and the cover are formed primarily of like or unlike resin materials. The core has a hardness which gradually increases from a center to a surface thereof, the hardness difference in JIS-C hardness units between the core center and the core surface being at least 15 and, letting (I) be the average value for cross-sectional hardnesses at a position about 15 mm from the core center and at the core center and letting (II) be the cross-sectional hardness at a position about 7.5 mm from the core center, the hardness difference (I)-(II) in JIS-C units being not more than ±2. The intermediate layer and cover have hardnesses which satisfy the condition: | 11-25-2010 |
| 20100292023 | Golf Club Head - This invention provides a golf club head including a face member. The face member includes a face portion forming a face, and a crown extending portion extending backward from the upper edge of the face portion. The width of the crown extending portion in a face to back direction at the toe side is larger than that in the face to back direction at the heel side. | 11-18-2010 |
| 20100273583 | GOLF BALL AND DIE FOR MOLDING THE SAME - There are provided a golf ball in which the depths of dimples after grinding, which greatly affect the trajectory of golf ball, can be controlled readily and exactly, and a golf ball molding die for manufacturing the golf ball. The golf ball molding die in accordance with the present invention comprises two die bodies in which a cavity for molding a golf ball is formed by joining the die bodies to each other; and a protrusion formed on the cavity side surface of at least one of the die bodies, the protrusion having a uniform height from the surface or an imaginary spherical surface on which the protrusion is assumed to be absent toward the center of the cavity, wherein when a parting line is at latitude zero degree, the protrusion is arranged in the range of from latitude about 10 degrees to latitude about 80 degrees. | 10-28-2010 |
| 20100273575 | MULTI-PIECE SOLID GOLF BALL - The present invention provides a multi-piece solid golf ball having a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The core is formed primarily of a rubber material and has a hardness which gradually increases from a center to a surface thereof, the hardness difference in JIS-C hardness units between the core center and the core surface being at least 15 and, letting (I) be the average value for cross-sectional hardnesses at a position about 15 mm from the core center and at the core center and letting (II) be the cross-sectional hardness at a position about 7.5 mm from the core center, the hardness difference (I)−(II) in JIS-C units being not more than ±2. The envelope layer, intermediate layer and cover have hardnesses which satisfy the condition: | 10-28-2010 |
| 20100267464 | GOLF CLUB SHAFT - A golf club shaft has a more attractive appearance than a coating of plating and also achieves a rustproofing effect within the shaft, while avoiding the problem of an increase in weight and processing of effluents associated with plated shafts. The golf club shaft has a shaft body, a covering film formed by chemical treatment of an outside surface and an inside surface of the shaft body, a coating film layer formed by electric painting on the covering film of at least the outside surface; and a pigment layer, in which a polarizing powder is dispersed, which is coated on the coating film layer. | 10-21-2010 |
| 20100261554 | COLORED GOLF BALL - The invention provides a golf ball having a core, a cover of at least one layer encasing the core, and a layer of paint applied to a surface of an outermost layer of the cover. At least one layer from among the outermost cover layer and the paint layer is a colored layer containing a base polymer, a pigment and a lubricant. The ball has a color tone, at a measurement area diameter of 5 mm in a method of measuring the color of a reflecting object according to JIS Z-8722, which, expressed in the Lab color system, satisfies the conditions 30≦L, −40≦a≦60, and −20≦b≦60. The colored golf ball of the invention has an excellent spin performance and durability, an appearance characterized by outstanding visibility, stylishness and luxury, and an excellent weather resistance and paint film adhesion. | 10-14-2010 |
| 20100261550 | COLORED GOLF BALL - In a golf ball composed of a core, a cover of at least one layer encasing the core, and a coat of paint applied to a surface of an outermost layer of the cover, the outermost layer of the cover or the coat of paint is colored with a fluorescent pigment. The ball has a color tone, at a measurement area diameter of 5 mm in a method of measuring the color of a reflecting object according to JIS Z-8722, which satisfies specific conditions in the Lab color system. The ball is endowed with an excellent spin performance and durability, an appearance characterized by outstanding visibility, stylishness and luxury, and an excellent weather resistance. | 10-14-2010 |
| 20100261549 | Golf club head - A golf head club has a high moment of inertia and thus produces a pleasing hitting sound. A metallic golf club head | 10-14-2010 |
| 20100261545 | GOLF CLUB HEAD - A golf club head of this invention includes a face, a plurality of score line grooves formed on the face, and a plurality of striations formed on the face. The angle formed by an arrangement direction of the plurality of striations and the score line grooves is between 40 degrees and 70 degrees, inclusive, as viewed clockwise from a toe side end of the score line grooves. | 10-14-2010 |
| 20100261544 | Golf Club Head - This invention provides a golf club head comprising a plurality of score lines formed in its face. Letting θ be the angle of the side wall of the scoreline with respect to the face, Cp be the center point of a virtual circle which has a radius of 0.254 mm and is inscribed in both the side wall and the face, F be the point of contact between the virtual circle and the face, G be the point of contact between the virtual circle and the side wall, P be a point farthest from the center point Cp in the segment from the point of contact F to the point of contact G in the edge portion of the scoreline, and D (mm) be the length from the center point Cp to the point P, the golf club head satisfies 56°≦θ≦80° and 0.270≦D≦0.287. | 10-14-2010 |
| 20100234138 | MULTI-PIECE SOLID GOLF BALL - The present invention provides a multi-piece solid golf ball having a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The envelope layer has an inner layer and an outer layer. The core is formed primarily of a rubber material. The inner and outer envelope layers, the intermediate layer and the cover are each formed primarily of the same or different resin materials. The inner and outer envelope layers, intermediate layer and cover have thicknesses which satisfy the following conditions (i) and (ii): | 09-16-2010 |
| 20100234137 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core, a cover, at least one intermediate layer situated therebetween, and a plurality of dimples on a surface of the ball. The diameter of the solid core, the deflection of the core when compressed under a final load of 130 kgf from an initial load of 10 kgf, the hardness at the center of the core, the hardness in a region 5 mm to 10 mm from the center of the core, the hardness 15 mm from the center of the core, and the surface hardness are set within specific ranges. The intermediate layer is composed primarily of a material obtained by mixing under applied heat a specific resin composition, and the thickness and material hardness of the intermediate layer, as well as the hardness difference between the surface of the solid core and the intermediate layer are set within specific ranges. The cover is formed primarily of polyurethane, and has a thickness and a material hardness set within specific ranges. The golf ball of the invention has an excellent flight performance, feel, controllability and scuff resistance. | 09-16-2010 |
| 20100234136 | GOLF CLUB HEAD - A weight material is provided on a heel side of a hosel portion in a golf club head. A convex portion E is provided on the heel side of the head. The weight material is disposed within the convex portion. The weight material is made of high specific gravity metal such as tungsten, and welded on both a lower column and a skirt portion. | 09-16-2010 |
| 20100234135 | Golf club head - A golf club head includes a portion with different thickness in a face portion. A region having a maximum thickness and a region having a minimum thickness are formed on a back of the face portion. An inclined portion with varying thickness is provided between those regions. | 09-16-2010 |
| 20100234123 | GOLF CLUB, METHOD FOR CHANGING SHAFT INSERTION DEPTH OF GOLF CLUB, AND METHOD FOR REPLACING SHAFT OF GOLF CLUB - A golf club, includes: a head; a shaft; a shaft case, having a cylindrical shape and fixed to a leading end of the shaft, a hosel, mounted on the head, wherein: the shaft case is inserted into the hosel from an upper end of the hosel; and the shaft case is fixed to the hosel so that an insertion depth of the shaft into the hosel is changed. | 09-16-2010 |
| 20100216575 | GOLF BALL AND METHOD FOR DESIGNING SAME - A golf ball includes noncircular dimples having smooth bottom surfaces; a method for designing the golf ball is disclosed. A noncircular dimple D | 08-26-2010 |
| 20100216574 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of one or more layer, which solid core has an inner core layer and an outer core layer. The inner core layer is formed primarily of a thermoplastic resin, has a diameter of from 21 to 38 mm, has a JIS-C cross-sectional hardness of from 60 to 83 at any single point on a cross-section obtained by cutting the inner core layer in half, and has a cross-sectional hardness difference between any two points on the cross-section of within ±5. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. Such a golf ball is able to achieve an increased distance. | 08-26-2010 |
| 20100216572 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of one or more layer, which solid core has an inner core layer and an outer core layer. The inner core layer is formed primarily of a thermoplastic resin, has a diameter of from 3 to 20 mm, and has a cross-sectional hardness difference of within ±5 between any two points on a cross-section obtained by cutting the inner core layer in half. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. Such a golf ball is able to achieve an increased distance and has a good feel on impact. | 08-26-2010 |
| 20100216571 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core encased by a cover of one or more layer, which solid core has an inner core layer and an outer core layer. The inner core layer is formed primarily of a specific, highly neutralized, ionomeric resin composition, has a diameter of from 10 to 38 mm, and has a cross-sectional hardness difference of within ±5 between any two points on a cross-section formed by cutting the inner core layer in half. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 30 to 42 mm. The sum of the respective hardnesses at the center of the inner core layer, at the outer core layer 1 mm outside a boundary between the inner core layer and the outer core layer, at the inner core layer 1 mm inside the boundary, and at the surface of the outer core layer is set to a value in a range of from 260 to 360. Such a golf ball is able to achieve an increased distance. | 08-26-2010 |
| 20100190581 | GOLF BALL - The invention provides a golf ball with a surface having a plurality of dimples formed thereon. The number of dimples is at least 250 and not more than 400, the dimples have a surface coverage (SR) of at least 70% and a volume ratio (VR) of at least 1.1%, are of at least three types and have an average depth of at least about 0.18 mm and a diameter (DM) to depth (DP) ratio (DM/DP) of not more than about 22. The (total number of Db)/(total number of Da) ratio, where Da represents dimples having a diameter of at least 3.7 mm and Db represents dimples having a diameter of less than 3.7 mm, is at least about 0.005 and not more than about 1. The ball has a coefficient of lift CL at a Reynolds number of 70,000 and a spin rate of 2,000 rpm which is maintained at 60% or more of the coefficient of lift CL at a Reynolds number of 80,000 and a spin rate of 2,000 rpm. The golf ball of the invention lowers fluctuations in lift and drag at high and low spin rates, enabling a stable trajectory to be achieved. | 07-29-2010 |
| 20100190580 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core, a cover, at least one intermediate layer interposed therebetween, and a plurality of dimples on a surface of the ball. The diameter of the solid core, the deflection of the core when compressed under a final load of 130 kgf from an initial load of 10 kgf, the hardness at the center of the core, the hardness in a region 5 mm to a region 10 mm from the center of the core, the hardness in a region 15 mm from the center of the core, and the surface hardness are set within specific ranges. The intermediate layer is composed primarily of a material obtained by mixing under applied heat a specific resin composition, and the thickness, material hardness and material melt flow rate (MFR) of the intermediate layer, as well as the hardness difference between the surface of the solid core and the intermediate layer are set within specific ranges. The cover is composed primarily of a thermoplastic resin, and has a thickness, a hardness and a material melt flow rate (MFR) set within specific ranges. In addition, the number of dimples on the ball and the total dimple trajectory volume (TVT) for the dimples on the ball are set in specific ranges. The golf ball of the invention has an excellent feel, controllability and flight performance. | 07-29-2010 |
| 20100190575 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball composed of a solid core, a cover, at least one intermediate layer interposed therebetween, and a plurality of dimples on a surface of the ball. The respective initial velocities (m/s) of the core, a sphere I composed of the core encased by the intermediate layer, and the golf ball satisfy formula A below, and the respective deflections (mm) of the core, the sphere I composed of the core encased by the intermediate layer, and the golf ball, when compressed under a final load of 130 kg from an initial load of 10 kgf, satisfy formula B below: | 07-29-2010 |
| 20100179000 | GOLF BALL MOLD AND GOLF BALL - The invention provides a golf ball mold composed of a plurality of mold parts which removably mate to form a hollow interior spherical cavity having a cavity wall with a plurality of dimple-forming protrusions thereon and which have a parting surface that is formed in a convex shape and a concave shape matching the convex shape. All or some of the dimple-forming protrusions are formed at positions at least about 0.03 mm away from an outside edge of a convex portion of the parting surface. The mold eliminates the possibility that molding flash projecting out from the parting surface of the mold will enter the dimples, as a result of which the dimples are not affected by the trimming of flash. Golf balls manufactured with such a mold are able to effectively manifest the aerodynamic performance of dimples tightly and uniformly arranged on the surface of the ball. | 07-15-2010 |
| 20100167838 | PUTTER HEAD - A putter head has a moment of inertia that can be adjusted easily by the golfer himself or herself. A putter head includes a body member having a face surface for hitting a ball and a back member turnably installed at the body member. The back member includes a plurality of movable parts, and the movable parts are turnably fixed to the body part. The movable part is turnably installed with one screw only. | 07-01-2010 |
| 20100167837 | GOLF CLUB HEAD - A golf club head of this invention includes a head body, a weight member attached to the head body, and a fixing unit to fix the weight member at one of a plurality of attachment positions of the head body. The plurality of attachment positions are located on a virtual cylindrical surface having the axis of a shaft to be mounted to the golf club head as a center. | 07-01-2010 |
| 20100167836 | PUTTER HEAD AND PUTTER HEAD SET - A putter head has the performance and characteristics of a putter, such as appearance, center of gravity, moment of inertia, ease of finding a putting line, and ease of setting, and can be adjusted by easily changing the shape of putter head by the golfer himself or herself, and a putter head set is also provided. A putter head includes a body member having a face surface for hitting a ball, and a back member detachably installed to the body member. The back member is detachably installed to the body member with one screw only. | 07-01-2010 |
| 20100167833 | SHAFT SET FOR GOLF CLUBS AND CLUB SET INCLUDING THE SAME - A shaft set includes plural shafts used for wood-type golf clubs each having a length of 40 inches to 48 inches. Among the plural shafts, a shaft used for a longer club has a smaller amount of change Δ1 in bending stiffness in a section from 600 mm to 800 mm from a tip of the shaft. Among the clubs using the plural shafts, the amount of change Δ1 in bending stiffness decreases at a constant rate in a range of 0.7×10 | 07-01-2010 |
| 20100161294 | METHOD OF ANALYSIS FOR KINETIC PROPERTIES OF GOLF CLUB HEAD AND GOLF CLUB THEREFOR - The accuracy or computation speed of analysis of a club head using the finite element method is increased. In a method of analysis of a golf club head, a model of a golf club head represented by the collection of elements including polygonal shell elements | 06-24-2010 |
| 20100160520 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material made of a resin composition composed of (a-I) an olefin-acrylic acid copolymer having a weight-average molecular weight (Mw) of from about 150,000 to about 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from about 3.0 to about 7.0, or a metal neutralization production thereof; (a-II) an olefin-methacrylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from about 120,000 to about 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from about 3.0 to about 7.0, or a metal neutralization production thereof; (b) an organic acid or a metal salt thereof; and (c) a basic inorganic metal compound which is capable of neutralizing acid groups in the composition. The golf ball material of the invention enables a highly neutralized ionomer having good flow properties and moldability to be achieved. Golf balls in which an injection molding of the golf ball material is used as the cover material have an excellent rebound while retaining a good durability. | 06-24-2010 |
| 20100160519 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material made of a resin composition composed of (a) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from about 120,000 to about 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from about 3.0 to about 10.0, or a metal neutralization product thereof, (b) an organic acid or a metal salt thereof, and (c) a basic inorganic metal which is capable of neutralizing acid groups in components (a) and (b). The golf ball material of the invention enables a highly neutralized ionomer having good flow properties and moldability to be achieved. Golf balls in which an injection molding of the golf ball material is used as the cover material have an excellent rebound and durability. | 06-24-2010 |
| 20100160517 | GOLF BALL MATERIAL AND METHOD OF PREPARING SAME - The invention provides a golf ball material made of a resin composition composed of (a-I) an olefin-acrylic acid copolymer having a weight-average molecular weight (Mw) of from about 150,000 to about 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from about 3.0 to about 7.0, or a metal neutralization production thereof; (a-II) an olefin-methacrylic acid copolymer-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from about 120,000 to about 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from about 3.0 to about 7.0, or a metal neutralization production thereof; (b) an organic acid or a metal salt thereof; and (c) a basic inorganic metal compound which is capable of neutralizing acid groups in the composition. The golf ball material of the invention enables a highly neutralized ionomer having good flow properties and moldability to be achieved. Golf balls in which an injection molding of the golf ball material is used as the cover material have an excellent rebound while retaining a good durability. | 06-24-2010 |
| 20100160515 | GOLF BALL MATERIAL AND METHOD OF PREPARING THE SAME - The invention provides a golf ball material made of a resin composition composed of (a) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from about 120,000 to about 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from about 3.0 to about 10.0, or a metal neutralization product thereof, (b) an organic acid or a metal salt thereof, and (c) a basic inorganic metal which is capable of neutralizing acid groups in components (a) and (b). The golf ball material of the invention enables a highly neutralized ionomer having good flow properties and moldability to be achieved. Golf balls in which an injection molding of the golf ball material is used as the cover material have an excellent rebound and durability. | 06-24-2010 |
| 20100160074 | GOLF CLUB HEAD - A golf club head having a hollow construction produces a characteristic low ball hitting sound to accommodate the diversity of golfers' preferences for ball hitting sounds even if the volume of the golf club head is increased to 430 to 500 cc and the weight thereof is decreased to 160 to 220 g. In a golf club head having a hollow construction and including a face part, a sole part, a crown part, and a side part, in which the head volume is 430 to 500 cc, and the head weight is 160 to 220 g, the area of the sole part is increased so that the primary natural frequency of the sole part is 2400 Hz or less, and a weight is formed at a position of the center of vibration in the sole part on the inner surface on the hollow construction side of the sole part. | 06-24-2010 |
| 20100160072 | METHOD OF ANALYSIS FOR KINETIC PROPERTIES OF GOLF CLUB HEAD AND GOLF CLUB THEREFOR - The accuracy or computation speed of analysis of a club head using the finite element method is improved. In a method of analysis of a golf club head, a model of the golf club head represented by a set of elements including tetrahedral solid elements | 06-24-2010 |
| 20100152330 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - The invention provides a golf ball material composed of (i) a non-ionomeric thermoplastic resin, (ii) an ionomeric resin and/or an acid-containing polymer which is the base polymer of an ionomeric resin, and (iii) a norbornene dicarboxylic anhydride and/or a derivative thereof. Methods for preparing such a material, and a golf ball which includes as a component therein a part made of the golf ball material are also provided. The golf ball material has a good thermal stability, flow and processability, and can thus be used to obtain high-performance golf balls endowed with an excellent rebound resilience, durability and flexibility. | 06-17-2010 |
| 20100144461 | GOLF CLUB HEAD - A golf club head of this invention includes a head body, a weight member attached to the head body, and a fixing unit to fix the weight member at one of a plurality of attachment positions of the head body. The plurality of attachment positions are located on a plane. The plane includes the center-of-gravity position of the head body without the weight member attached thereto and the axis of a shaft to be attached to the golf club head. | 06-10-2010 |
| 20100144459 | GOLF CLUB AND METHOD FOR ADJUSTING PROPERTIES THEREOF - According to one aspect of the invention, a golf club includes: a head having a hosel having a hosel hole; a shaft; a shaft case having a shaft insertion hole to which one end of the shaft is inserted and configured to be inserted to the hosel hole; and a ring-shaped screw member configured to be screwed into one end of the hosel to fix the shaft case in the hosel hole, and to be fitted with an outer face of an one end of the shaft case so as not to contact with the shaft directly, wherein an axis of the shaft insertion hole is nonparallel to an axis of the hosel hole, and an inner face of the hosel hole and an outer face of the shaft case includes a triangular or more polygonal cross-sectional face that is perpendicular to the axis of the hosel hole. | 06-10-2010 |
| 20100125006 | GOLF BALL - The present invention provides a golf ball composed of a core and a cover having an outside surface on which are formed a plurality of dimples. Letting BV and CV be the initial velocity (m/s) of, respectively, the ball and the core as measured by a method using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument and letting BE and CE be the deflection (mm) of, respectively, the ball and the core when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf), the ball initial velocity BV is from 70.0 to 76.0 m/s and the ball satisfies the formula 0≦(CV−BV)−(CE−BE)≦2. The golf ball of the invention has a flight distance that can be reduced compared with official golf balls currently in use, yet has the same good feel on impact and excellent controllability, scuff resistance and durability to repeated impact as a game ball. | 05-20-2010 |
| 20100125005 | GOLF BALL - The present invention provides a golf ball composed of a core and a cover having an outside surface on which are formed a plurality of dimples. Letting BV and CV be the initial velocity (m/s) of, respectively, the ball and the core as measured by a method using an initial velocity measuring apparatus of the same type as a USGA drum rotation-type initial velocity instrument and letting BE and CE be the deflection (mm) of, respectively, the ball and the core when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf), the ball initial velocity BV is from 70.0 to 76.0 m/s and the ball satisfies the formula −1.0≦(BV/BE)−(CV/CE)≦3.0. The golf ball of the invention has a flight distance that can be reduced compared with official golf balls currently in use, yet has the same good feel on impact and excellent controllability, scuff resistance and durability to repeated impact as a game ball. | 05-20-2010 |
| 20100125001 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - The present invention provides a golf ball material which is made of an ionomer composition that includes a phenolic resin component. The invention provides also a golf ball composed of a core and a cover layer, or a core, a cover layer and at least one intermediate layer therebetween, wherein the golf ball material is used in at least one layer of the core or cover. The invention additionally provides a method for preparing the golf ball material by using (i) or (ii) below:
| 05-20-2010 |
| 20100105501 | GOLF CLUB HEAD - A golf club head maintains a low weight of a face part, keeps the resilience property of the face part in the rule conformity range, and prevents the resilience performance from decreasing even when a ball is hit by a face part deviating from the sweet spot. The golf club head has a sole, a crown, a toe, and a heel and comprises a face part formed of a metallic material. The face part comprising: an outer peripheral portion; a thick-walled portion having a wall thickness greater than that of the outer peripheral portion, the wall thickness of the thick-walled portion being greatest in a central portion of the face part and decreasing gradually from the central portion toward the outer peripheral portion, wherein the thick-walled portion is positioned over a region having a shape formed by depressing a circular or elliptical shape from two opposite sides thereof, the first depression on the toe side being directed orthogonal in the sole direction, and the second depression on the heel side being directed orthogonal in the crown direction; and at least two thin-walled portions having a wall thickness less than that of the outer peripheral portion, the thin-walled portions being positioned over a region surrounded by the two opposite sides of the circular or elliptical shape and the depressions. | 04-29-2010 |
| 20100093468 | GOLF BALL - A golf ball has an increased surface occupancy ratio of dimples, the dimples are shallow to restrain a lift acting on the golf ball flying in a high-speed region after the ball has been hit, and the lift of the golf ball flying in a low-speed region in the latter half of the trajectory is maintained for a long time, by which a longer carry can be obtained. The golf ball has plural dimples formed on the surface thereof, in which at least about 10 percent of dimples of all the dimples on the surface are noncircular dimples in which a boundary line between a land part and the dimple include a curved line part and a straight line part, and the noncircular dimples each have a flat bottom surface. | 04-15-2010 |
| 20100087271 | GOLF CLUB HEAD - A golf club head of this invention is a hollow golf club head which includes a face portion, a crown portion, a sole portion, and a side portion. The wall thickness of a face/crown bending portion, which is molded by casting and forms the boundary between the face portion and the crown portion, is smaller on the toe side than on the heel side. | 04-08-2010 |
| 20100087270 | GOLF CLUB HEAD - This invention provides a golf club head including a plurality of score lines on the face. The golf club head includes a plurality of striations formed on the face and extending from a toe side to a heel side. A depth Dp of each striation satisfies 10 μm≦Dp≦40 μm. A cross-sectional shape of each striation is an isosceles trapezoid having an upper base at the face side and a lower base at the back side of the golf club head. The upper base and lower base satisfy the upper base>the lower base. A width Pb of the bottom portion of each protrusion formed between the striations and a width Wb of the lower base satisfy Pb| 04-08-2010 | |
| 20100075774 | GOLF CLUB HEAD - A golf club head of this invention includes a head body, a weight member attached to the head body, and a fixing unit to fix the weight member at any one of a plurality of attachment positions of the head body. The plurality of attachment positions are located on a straight line included in a plane. The plane includes the center-of-gravity position of the head body without the weight member attached thereto and is perpendicular to the toe-and-heel direction of the head body. | 03-25-2010 |
| 20100062876 | GOLF BALL - The invention provides a multi-piece solid golf ball having a core of at least one layer, a cover of at least two layers which includes an inner cover layer and an outermost cover layer, and a plurality of dimples formed on a surface of the ball. The thickness and Shore D hardness of the outermost cover layer are set in specific ranges, the thickness and Shore D hardness of the inner cover layer are set in specific ranges, and the ball surface has, as expressed in the Lab color system defined by JIS Z-8730, a lightness L value of at least 89, an a value of at least 2 but not more than 10, and a b value of −20 or above. The multi-piece solid golf ball of the invention increases the reddish coloring of a white golf ball, thereby enhancing the stylishness of the ball and improving the way the ball looks and feels to the golfer when it is played. | 03-11-2010 |
| 20100056304 | GOLF BALL AND METHOD OF IMPROVING GOLF BALL PERFORMANCE - Golf balls having an outermost layer, which outermost layer has been subjected to impregnation treatment with an isocyanate and/or isothiocyanate-containing olefin compound but has not been topcoated, exhibit at least one improved golf ball attribute, such as scuff resistance or spin performance, compared with similar golf balls that have not been impregnation treated. | 03-04-2010 |
| 20100056303 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - The invention provides a golf ball material composed of an ionomeric resin composition obtained by melt-blending under applied heat one or more compounds selected from among UV/EB-curable materials with, in the presence of a peroxide, a non-ionomeric thermoplastic resin and an ionomeric resin; or of an ionomeric resin composition obtained by using, instead of the ionomeric resin, an acid-containing polymer base of the ionomeric resin and subjecting the acid-containing polymer composition similarly prepared by melt-blending under applied heat to an acid-neutralizing reaction with a metal ionic species. Methods for preparing such a material, and golf balls which include as a component therein a molding made of the golf ball material are also provided. The golf ball material has a good thermal stability, flow and processability, and can thus be used to obtain high-performance golf balls endowed with an excellent abrasion resistance, scuff resistance, durability and flexibility without a loss of rebound. | 03-04-2010 |
| 20100056299 | GOLF BALL AND METHOD OF IMPROVING GOLF BALL PERFORMANCE - A golf ball having a polymer layer that has been subjected to impregnation treatment with an isocyanate and/or isothiocyanate-containing olefin compound exhibits at least one improved golf ball attribute, such as scuff resistance or spin performance, compared with an original golf ball that has not been treated by impregnation. | 03-04-2010 |
| 20100056295 | GOLF CLUB HEAD - A golf club head according to the present invention comprises a plurality of score lines on a face, and a stair-shaped portion comprising a plurality of steps formed on a side wall of the score line from a face side end of the side wall in a depth direction of the score line. | 03-04-2010 |
| 20100056292 | GOLF CLUB AND SHAFT REPLACING METHOD - According to an aspect of the invention, a golf club includes: a head having a hosel; a shaft; a shaft case fixed to one end of the shaft, and configured to be inserted into the hosel, the shaft case being formed in a substantially cylindrical shape; and a ring-shaped screw member configured to be screwed into one end of the hosel to fix the shaft case in the hosel, and to be fitted with an outer face of an one end of the shaft case, the ring-shaped screw member being noncontact with the shaft. | 03-04-2010 |
| 20100048324 | GOLF CLUB HEAD - There is provided a golf club head that produces a loud hitting sound satisfying the golfer even if the volume of the golf club head having a hollow structure is increased to at least about 400 cc. A golf club head | 02-25-2010 |
| 20100035703 | PUTTER HEAD - A putter head prevents a ball from sliding over a green while maintaining golfers' preferred hitting feel and roll of the ball. A face insert fitted in a face of the putter head has an outer layer which serves as a ball-hitting surface and an inner layer which is located on an inner side of a head body. A smash factor of a second polymer material forming the inner layer is greater than a smash factor of a first polymer material forming the outer layer. Two types of groove, grooves of a first groove group and grooves of a second groove group are formed in an external surface of the outer layer. The grooves of the first groove group may be 0.25 to 1.6 mm wide and 0.05 to 0.5 mm deep and the grooves of the second groove group may be 0.075 to 0.5 mm wide and 0.025 to 0.1 mm deep. | 02-11-2010 |
| 20100009779 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - A golf ball material composed of (A) an olefin-containing thermoplastic polymer having an acid content of at least 0.5 wt % but less than 5.0 wt %, (B) a resin composition which includes one or more selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and (C) an oxygen-containing inorganic metal compound has a good thermal stability, flow and processability, making it suitable for injection molding. The golf ball material is ideal for the production of high-performance golf balls endowed with durability, scuff resistance and optimal hardness without a loss of rebound in the molded article. | 01-14-2010 |
| 20100004072 | COLOR GOLF BALL - The invention provides a colored golf ball composed of a core, a cover having a plurality of dimples formed on an outside surface thereof, and an inside layer in contact with the cover. The ball satisfies the following conditions:
| 01-07-2010 |
| 20090325729 | IRON GOLF CLUB HEAD - A golf club head ( | 12-31-2009 |
| 20090312116 | GOLF CLUB HEAD - A golf club head of this invention includes a face, a plurality of score line grooves formed on the face, and a plurality of striations formed on the face. The angle formed by an arrangement direction of the plurality of striations and the score line grooves is between 40 degrees and 70 degrees, inclusive, as viewed clockwise from a toe side end of the score line grooves. | 12-17-2009 |
| 20090305809 | GOLF CLUB SHAFT AND GOLF CLUB THEREWITH - A golf club shaft that has a flexural rigidity distribution allows a user to easily adjust swing timing even when a golf club using the golf club shaft is long. The golf club shaft comprises a section between a point 500 mm and a point 800 mm from a tip end of the shaft, wherein the flexural rigidity El of the shaft monotonically increases in the section from the point 500 mm to the point 800 mm, wherein Δ1/Δ2 is at least about 1.5 provided that the rate of change of the flexural rigidity EI of the shaft in a first subsection between a point 500 mm and a point 600 mm from the tip end is denoted by Δ1, and the rate of change of the flexural rigidity EI of the shaft in a second subsection between a point 700 mm and a point 800 mm from the tip end is denoted by Δ2, and wherein the flexural rigidity EI of the shaft at a point 750 mm from the tip end is at least about 4.1×10 | 12-10-2009 |
| 20090298617 | GOLF BALL MATERIAL AND GOLF BALL - The invention provides a golf ball material composed of a polymer material that contains spherical inorganic particulates, which is well adapted for use in at least one component of a golf ball composed of one or more layers. The golf ball material of the invention improves the flight performance of golf balls compared with polymer materials containing amorphous inorganic particulates. | 12-03-2009 |
| 20090286939 | METHOD FOR PRODUCING GOLF BALL - A method of manufacturing golf balls composed of a core and a cover of one or more layer that encloses the core, at least one cover layer being made of a thermoplastic polyurethane composition characterized by including at least 90 wt % of a thermoplastic polyurethane obtained by a polyurethane-forming reaction of an organic diisocyanate compound with a long-chain polyol and a chain extender, which thermoplastic polyurethane composition cover layer has an inherent viscosity in a DMF solvent of larger than 1.5 dl/g and an inherent viscosity in a 0.05 mol/L n-butylamine-containing DMF solution of larger than 0.5 dl/g, the golf ball manufacturing method being characterized by:
| 11-19-2009 |
| 20090281244 | Golf Ball Material, Golf Ball And Method For Preparing Golf Ball Material - The invention provides a golf ball material comprising components (A), (B) and (C): (A) a mixture of different masterbatches prepared by separately masterbatching two or more different metal ions (A1) or a masterbatch prepared by simultaneously masterbatching two or more different metal ions in itself (A2), (B) one or more polymer selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and (C) one or more polymer having an acid content of from about 0.5 to about 30 wt % and selected from the group consisting of olefin-unsaturated carboxylic acid copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester terpolymers, unsaturated carboxylic anhydride-containing polymers, unsaturated dicarboxylic acid-containing polymers and unsaturated dicarboxylic acid half ester-containing polymers. The invention also provides a method for preparing such a golf ball material, and a golf ball made of the material. The golf ball material has a good thermal stability, flow and processability, making it suitable for injection-molding. Moreover, this material is ideal for producing, without any loss of the rebound resilience of golf ball parts molded from the material, high-performance golf balls having excellent durability, scuff resistance and flexibility. | 11-12-2009 |
| 20090270200 | GOLF BALL MATERIAL AND GOLF BALL - The present invention provides a golf ball material which is a thermoplastic ionomer blend composition of an acid-containing ethylene-based terpolymer having a weight-average molecular weight Mw of at least about 100,000, an acid-containing ethylene-based copolymer and/or terpolymer having a Mw of about 1,500 to about 95,000, and a low-molecular-weight acid-containing compound having a molecular weight of up to about 1,000, at least some portion of which composition is neutralized. The golf ball material is soft and resilient, and has a good durability and improved moldability. | 10-29-2009 |
| 20090264220 | GOLF BALL - The present invention provides a golf ball which includes (I) a first member composed of a material molded under heat from a rubber composition of (a) a base rubber composed primarily of a mixture of at least 60 wt % of a polybutadiene having a stress relaxation time (T | 10-22-2009 |
| 20090258723 | GOLF CLUB AND SHAFT REPLACING METHOD - According to an aspect of the invention, a golf club includes: a golf club head having a hosel; a shaft; a shaft case fixed to one end of the shaft, and inserted into the hosel, the shaft case being formed in a substantially cylindrical shape; and a ring-shaped screw member screwed into one end of the hosel to fix the shaft case in the hosel, the ring-shaped screw member being detachable from the hosel; | 10-15-2009 |
| 20090253534 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - The invention provides golf ball materials which include, in admixture, (A) an oxygen-containing inorganic metal compound, (B) one or more polymers selected from the group consisting of multi-component polyamides, and (C) an acid-containing polymer, and additionally includes, if the oxygen-containing inorganic metal compound (A) does not include a zinc cationic species, (D) a zinc ionomer. The invention also provides methods for preparing such golf ball materials, and golf balls made with the materials. The golf ball materials are multi-component polyamide blend compositions having an excellent flow and processability and a suitable hardness, making them ideal as materials for obtaining high-performance golf balls which are endowed with outstanding durability and scuff resistance without any loss in rebound resilience. | 10-08-2009 |
| 20090247322 | GOLF BALL - The invention provides a golf ball having a ball component made of a material molded under heat from a rubber composition of (a) a base rubber which includes a polybutadiene of at least 40% cis-1,4 structure, (b) an unsaturated carboxylic acid and/or a metal salt thereof, (c) an organic peroxide, and (d) a halogenated thiophenol, and/or a metal salt thereof, which is prepared by reacting starting materials in a polar solvent then washing with water and drying. The golf ball of the invention uses as a ball component a material of exceptional resilience which is obtained by molding a rubber composition under applied heat. As a result, the ball as a whole has an excellent rebound. | 10-01-2009 |
| 20090247321 | Golf Club Head - This invention provides a golf club head including a face member. The face member includes a face portion forming a face, and a crown extending portion extending backward from the upper edge of the face portion. The width of the crown extending portion in a face to back direction at the toe side is larger than that in the face to back direction at the heel side. | 10-01-2009 |
| 20090247320 | GOLF CLUB HEAD - A golf head club has a high moment of inertia and thus produces a pleasing hitting sound. A metallic golf club head | 10-01-2009 |
| 20090247318 | Golf Club Head - This invention provides a golf club head including a plurality of score lines on the face. The golf club head includes a plurality of striations formed on the face and extending from a toe side to a heel side. The cross-sectional shape of each of the striations is a triangle asymmetric with regard to a virtual center line in the width direction, and the smallest interior angle among three interior angles of the triangle is placed at the sole side of the golf club head. A depth D from the face to the deepest portion of each of the striation satisfies 10 μm≦D≦40 μm. | 10-01-2009 |
| 20090240479 | METHOD OF IDENTIFYING AN ANTINODE OF A PRIMARY VIBRATION MODE OF A GOLF CLUB HEAD - This invention provides a method of identifying an antinode of a primary vibration mode of the golf club head having a hollow golf club head having a face portion, a crown portion, a sole portion, and a side portion. A viscoelastic body is to be mounted in at least one of the face portion, crown portion, sole portion, and side portion. The viscoelastic body is mounted in a part of a portion where the viscoelastic body is to be mounted, the part corresponding to an antinode of a primary vibration mode. | 09-24-2009 |
| 20090221385 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - A golf ball material composed of (A) an oxygen-containing inorganic metal compound in the form of a particulate or a master batch capable of neutralizing at least some of the acid groups in an acid-containing polymer blend, (B) one or more polymer selected from among diene polymers, thermoplastic polymers and thermoset polymers, and (C) an acid-containing polymer is prepared by mixing component A in a blend of components B and C. The golf ball material has a good heat resistance, flowability and processability, and can be used to produce high-performance golf balls having durability, scuff resistance and optimal hardness without a loss of rebound. | 09-03-2009 |
| 20090221383 | Wood Club Head - A wood club head having a loft angle of not less than 13° is provided. The hosel length is not less than 20 mm. The face progression is set to fall within a range of 12 mm to 16 mm (both exclusive). The barycenter depth is set to fall within a range of 20 mm to 25 mm (both exclusive). | 09-03-2009 |
| 20090211476 | METHOD FOR PRINTING ON SPHERICAL OBJECT AND PAD TO BE USED THEREFOR - There are provided a printing method in which at least approximately hemispherical portion of a spherical object to be printed can be printed by pressing a pad against the portion one time, and which can prevent an image printed on the spherical object to be printed from being elongated or distorted, and a printing pad used for this printing method. The method for printing on the spherical object to be printed comprises the steps of preparing a hollow printing pad having a transfer surface, the printing pad being configured so that when the transfer surface is pushed, the gas in the hollow part is released to the outside of the printing pad; transferring ink or paint in recesses formed on the surface of a printing plate to the transfer surface of the printing pad by applying the ink or paint onto the surface of the printing plate and by pressing the transfer surface of the printing pad against the surface of the printing plate; and transferring the ink or paint, which has been transferred to the transfer surface of the printing pad, to the object to be printed by pressing the transfer surface of the printing pad, to which the ink or paint has been transferred, against the object to be printed until at least the hemispherical portion of the object to be printed is wrapped by the transfer surface of the printing pad. | 08-27-2009 |
| 20090209366 | GOLF BALL - The invention provides a golf ball composed of a core, a cover having a plurality of dimples on an outside surface thereof, and an intermediate layer disposed between the core and the cover. The core has a deflection, when compressed under a final load of 130 kgf from an initial load of 10 kgf, of at least 3.0 mm but not more than 5.0 mm. The intermediate layer is formed of a highly neutralized resin material, and has a Shore D hardness of at least 40 but not more than 60 and a thickness of at least 1.7 mm but not more than 4.0 mm. The number of dimples is at least 272 but not more than 348. The golf ball, through a combination of dimples which do not cause a loss of lift in the low-velocity, low-spin rate region of the ball trajectory and a low-spin construction, travels farther and is therefore beneficial for competitive use by both skilled and amateur golfers. | 08-20-2009 |
| 20090203841 | GOLF BALL AND METHOD OF MANUFACTURE - In a golf ball composed of a core and a cover having a plurality of layers that encloses the core, at least a first layer of the cover is formed primarily of a heated mixture of (A) a metal ion neutralization product of an olefin-unsaturated carboxylic acid copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer, (B) at least one type of olefin-unsaturated carboxylic acid copolymer and/or olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having the same content of unsaturated carboxylic acid as component A, and (C) a thermoplastic polyurethane elastomer; and at least one other cover layer adjoining the at least first cover layer is formed primarily of a non-ionomeric thermoplastic elastomer. Because the golf ball is made using a cover stock having a good heat resistance, good moldability, good paint film adhesion and good adhesion to adjoining layers, it has an excellent rebound, an excellent feel when hit, and is more resistant to a decline in durability to impact. | 08-13-2009 |
| 20090197701 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball comprises a core having a 5 structure consisting of at least two layers and a cover on the core consisting of outer and inner cover layers. The outer cover layer has a Shore D hardness of 40-60 degrees. The inner cover layer has a Shore D hardness of up to 53 degrees and lower than that of the outer cover layer. The ball's carry is comparable to conventional solid golf balls and spin receptivity is approximate to wound golf balls while the ball is durable and offers pleasant feel. | 08-06-2009 |
| 20090197700 | Golf Club Head - This invention provides a golf club head including a plurality of score lines on the face. In the golf club head according to this invention, the score line includes a pair of side surfaces and a bottom portion having a protruding portion protruding toward the face. An angle between the side surface and the face is not less than 60 degrees. A cross-sectional area A (inch | 08-06-2009 |
| 20090176597 | Golf Club Head - The present invention provides a golf club head that can hit a ball with a sufficiently large amount of backspin. The golf club head according to the present invention is an iron type golf club head made of a metal and including a flat face. A plurality of traces are formed by milling on the face. The pitch of the traces is between 0.1 mm and 1 mm. | 07-09-2009 |
| 20090170631 | PUTTER HEAD - A putter head wherein a depth of a center of gravity, ZGR, is a value greater than half of a head width W, namely, ZGR≧W/2, and that a moment of inertia, IY, about the center of gravity is such that IY≧4000 g·cm | 07-02-2009 |
| 20090160088 | GOLF BALL AND DIE FOR MOLDING THE SAME - There are provided a golf ball in which the depths of dimples after grinding, which greatly affect the trajectory of golf ball, can be controlled readily and exactly, and a golf ball molding die for manufacturing the golf ball. The golf ball molding die in accordance with the present invention comprises two die bodies in which a cavity for molding a golf ball is formed by joining the die bodies to each other; and a protrusion formed on the cavity side surface of at least one of the die bodies, the protrusion having a uniform height from the surface or an imaginary spherical surface on which the protrusion is assumed to be absent toward the center of the cavity, wherein when a parting line is at latitude zero degree, the protrusion is arranged in the range of from latitude about 10 degrees to latitude about 80 degrees. | 06-25-2009 |
| 20090143170 | METHOD FOR PREPARING GOLF BALL AND GOLF BALL - The present invention provides a method of manufacturing a golf ball having a solid core formed of a rubber composition and a cover of at least one layer encasing the core, which method includes the steps of treating a surface of the core with a solution containing a halogenated isocyanuric acid and/or a metal salt thereof, and covering the treated core with a cover material. The invention also provides a golf ball obtained by such a method. Golf balls obtained by this method have a good feel and a good scuff resistance, and also have a high durability to impact. | 06-04-2009 |
| 20090143166 | Golf Club Head - This invention provides a golf club head including a plurality of score lines on a face. In the golf club head according to this invention, the angle between each side surface of the score lines and the face is 48° or more. Edges of the score lines are formed to be positioned within a second virtual circle with a radius of 0.011 inches, the second virtual circle being concentric with a first virtual circle which internally touches the side surface of the score line and the face with a radius of 0.010 inches. | 06-04-2009 |
| 20090143165 | GOLF CLUB HEAD - This invention provides a golf club head including a plurality of score lines on a face. In the golf club head according to this invention, the angle between each side surface of the score lines and the face is 48° or more. Edges of the score lines are formed to be positioned within a second virtual circle with a radius of 0.011 inches, the second virtual circle being concentric with a first virtual circle which internally touches the side surface of the score line and the face with a radius of 0.010 inches. | 06-04-2009 |
| 20090137338 | WOOD-TYPE GOLF CLUB HEAD - According to one embodiment, a wood-type golf club head includes: a face portion; a sole portion; a crown portion; a leading edge defined between the face portion and the sole portion; an upper edge defined between the face portion and the crown portion; wherein, at a basic state that the golf club head is set on a horizontal plane, a contact point between the horizontal plane and the sole portion is defined as a ground point, wherein a plane passing through the ground point and extending in a direction of a target line is defined as a vertical plane, wherein a height from the horizontal plane to a first intersection point where the face upper edge intersects the vertical plane is defined as a face height H | 05-28-2009 |
| 20090124761 | METHOD OF MANUFACTURING A GOLF BALL - The present invention relates to an industrially beneficial method of manufacturing golf balls which includes the steps of pre-preparing an inorganic filler masterbatch by mixing an inorganic filler with a rubber material, preparing a rubber composition that contains the rubber material by using the masterbatch, and employing a material obtained by molding the rubber composition under heat as a golf ball component. The masterbatch is composed of:
| 05-14-2009 |
| 20090124758 | GOLF BALL - The present invention relates to a golf ball having a ball component made of a material molded under heat from a rubber composition which includes; | 05-14-2009 |
| 20090124757 | METHOD OF MANUFACTURING A GOLF BALL - The present invention relates to an industrially beneficial method of manufacturing golf balls which includes the steps of pre-preparing a masterbatch of an unsaturated carboxylic acid and/or a metal salt thereof by mixing an unsaturated carboxylic acid and/or a metal salt thereof with a rubber material, preparing a rubber composition that contains the rubber material by using the masterbatch, and employing a material obtained by molding the rubber composition under heat as a golf ball component. The masterbatch is composed of: | 05-14-2009 |
| 20090124412 | GOLF BALL - The present invention relates to a golf ball having a ball component made of a material molded under heat from a rubber composition which includes:
| 05-14-2009 |
| 20090123595 | MOLD FOR FORMING GOLF BALL AND GOLF BALL MANUFACTURED USING THE SAME - There are provided a golf ball molding die in which a mold deposit produced when a gas is discharged can be removed easily, and the area of a venting opening per unit area of the tip end of a pin can be increased tremendously, and a golf ball manufactured by using the golf ball molding die. A golf ball molding die in accordance with the present invention includes at least two die bodies which are configured so that a cavity for forming a golf ball is formed by joining the die bodies to each other; a venting hole which is provided in at least one of the die bodies to discharge a gas in the cavity; and a pin which is present in the venting hole, the pin being configured so that a plurality of layers are lapped on each other from the center thereof. | 05-14-2009 |
| 20090119079 | GOLF BALL AND MECHANICAL ANALYSIS OF THE SAME - The accuracy or computation speed of mechanical analysis of a golf ball using the finite element method is increased. In the mechanical analysis, a model representing the golf ball is prepared on a computer, and computation is made by the finite element method using elements and nodes. At this time, the elements are made solid elements of hexahedron, the aspect ratio of the shape of each element is set so as to be not lower than 1.0 and not substantially higher than 6.5, and nodes are provided on the sides and at the vertexes of the hexahedron of element. | 05-07-2009 |
| 20090118039 | GOLF BALL - The present invention relates to a golf ball having a core, a cover of at least one layer encasing the core, and a surface on which a plurality of dimples are formed. The cover has an outermost layer with a thickness of at least 1.2 mm and a Shore D hardness of at least 50 but not more than 65. The ball surface has a lightness L value, expressed in the Lab color system as defined by JIS Z8730, of at least 89, an a value of at least 2 but not more than 10, and a b value of −20 or above. Increasing the reddish coloring of a white golf ball enhances the fashionability of the ball and improves the way the ball looks and feels to the golfer when it is played. | 05-07-2009 |
| 20090118038 | GOLF BALL - The present invention relates to a golf ball having a ball component made of a material molded under heat from a rubber composition which includes:
| 05-07-2009 |
| 20090111614 | GOLF BALL - The present invention relates to a golf ball having a solid core of at least one layer, a cover of at least one layer encasing the core, and a paint film on a surface of the cover, wherein at least one cover layer and/or the paint film includes a luster pigment composed of metal oxide-coated alumina flakes. This golf ball has a high commercial value because of its visual impact and high quality feel, and because it achieves a bright, color-saturated effect without the yellow cast typical of conventional golf ball surfaces. | 04-30-2009 |
| 20090111613 | GOLF BALL - An object of the present invention is to provide a golf ball having an improved aesthetic appearance and enhanced flying performance. The present invention provides a golf ball on which a plurality of dimples are arranged on the spherical surface thereof, wherein each of the dimples has at least two contour main parts and contour connecting parts, and the at least two contour main parts are connected to each other by the contour connecting parts, and the contour connecting parts are formed so as to be curved toward the inside of the contour main parts from the outermost points. | 04-30-2009 |
| 20090111612 | THREE-PIECE SOLID GOLF BALL - The present invention provides a three-piece solid golf ball having a core molded under heat from a specific rubber composition and inner and outer cover layers encasing the core. By optimizing the core deflection under a specific load and the overall thickness of the cover layers, by forming the inner cover layer of a highly neutralized ionomer resin composition, and by optimizing within specific ranges the Shore D hardnesses of the inner cover layer and the outer cover layer, the spin rate of the ball on shots with a driver can be sufficiently reduced, enabling an increased distance to be achieved. | 04-30-2009 |
| 20090111611 | MULTI-PIECE SOLID GOLF BALL - The present invention provides a multi-piece solid golf ball having a core, an envelope encasing the core, an intermediate layer encasing the envelope, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The envelope is composed of at least two layers. The core is formed primarily of a rubber material. The envelope, intermediate layer and cover are each formed primarily of the same or different resin materials. The envelope layers and the intermediate layer have a combined thickness which is at least 5.0 times thicker than the cover. An optimized surface hardness relationship exists between the core, a Sphere I composed of the core encased by the envelope layers, a Sphere II composed of the core encased by the envelope layers and the intermediate layer, and a Sphere III composed of the core encased by the envelope layers, the intermediate layer and the cover. The golf ball has an outstanding flight performance and controllability which are acceptable to professionals and other skilled players, in addition to which it has an excellent durability to cracking under repeated impact and an excellent scuff resistance. | 04-30-2009 |
