| Patent application number | Description | Published |
|---|
| 20090111608 | 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 composed overall of an inner layer and an outer layer which are each formed primarily of a rubber material, with the outer core layer being harder than the inner core layer. The envelope layer, intermediate layer and cover have respective thicknesses which satisfy the condition: cover thicknesscover material hardness. The golf ball has a lower spin rate on full shots with a driver, further increasing the distance traveled by the ball. Moreover, it has a good controllability, maintaining in particular a straight trajectory on full shots, and also has an excellent scuff resistance. | 04-30-2009 |
| 20090111609 | 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 composed overall of an inner layer and an outer layer which are each formed primarily of a rubber material, with the outer core layer being harder than the inner core layer. The envelope layer, intermediate layer and cover have respective thicknesses which satisfy the condition: cover thicknesscover material hardness. The golf ball has a lower spin rate on full shots with a driver, further increasing the distance traveled by the ball. Moreover, it has a good controllability, maintaining in particular a straight trajectory on full shots, and also has an excellent scuff resistance. | 04-30-2009 |
| 20090111610 | 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, the envelope layer and the intermediate layer are each formed primarily of the same or different resin materials, and the cover is formed primarily of a thermoplastic resin or a thermoplastic elastomer. The envelope layer, intermediate layer and cover have thicknesses which satisfy the condition: cover thicknesscover material hardness. 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 |
| 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 |
| 20100048326 | 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 surface hardness of the core has a JIS-C hardness value of 40 to 95, the center hardness of the core has a JIS-C hardness value of 30 to 72, and the hardness difference therebetween is from 4 to 14. 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. 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. | 02-25-2010 |
| 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 |
| 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 |
| 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 |
