Class / Patent application number | Description | Number of patent applications / Date published |
065134200 | Subatmospheric pressure or vacuum utilized | 14 |
20090000335 | GLASS PRODUCTION PROCESS - To provide a glass production process capable of reducing bubbles remaining in glass after production, substantially without a refiner. | 01-01-2009 |
20090165501 | CONDUIT STRUCTURE FOR MOLTEN GLASS AND VACUUM DEGASSING APPARATUS USING THE CONDUIT STRUCTURE - A conduit structure for molten glass, a conduit system for molten glass, a vacuum degassing apparatus and a method for vacuum-degassing molten glass by use of the vacuum degassing apparatus, which are capable of effectively removing components eluted from a refractory brick forming a conduit for molten glass, foreign substances generated in the interface between molten glass and a platinum wall surface forming a conduit for molten glass, a bubble remaining in a surface layer of molten glass, a glass material denatured by volatilization, and the like, are provided. | 07-02-2009 |
20090217708 | METHODS AND APPARATUS FOR REDUCING PLATINUM-GROUP DEFECTS IN SHEET GLASS - A substantially-isolated/controlled, limited-volume, gas-filled space (e.g., | 09-03-2009 |
20110016922 | VACUUM DEGASSING APPARATUS, APPARATUS FOR PRODUCING GLASS PRODUCTS AND PROCESS FOR PRODUCING GLASS PRODUCTS - A vacuum degassing apparatus having a throughput of at least 200 tons/day without causing problems such as a stagnation of molten glass flow in the molten glass flow path, an increment of flow rate of the molten glass flow in a local area, an excessive increment of pressure loss of the molten glass flow. | 01-27-2011 |
20120103020 | APPARATUS FOR REFINING SILICON AND METHOD FOR REFINING SILICON - The present invention is a silicon refining apparatus including, in a reduced pressure vessel: a crucible capable of holding molten silicon; a heat-retaining lid capable of being placed over the crucible; and a heating device. The crucible has a lateral outer-circumferential portion provided with a first thermal-insulation material. The heat-retaining lid is a plate-like member made of carbon felt and provided with a carbon composite material at least on opposed main surfaces. The heat-retaining lid has opposed main surfaces with an opening formed to extend therethrough. The carbon composite material on the main surface of the heat-retaining lid on the crucible side is so placed as to cover an upper surface of the first thermal-insulation material when the heat-retaining lid is placed at an upper surface of the crucible. | 05-03-2012 |
20120216574 | Process for Melting and Refining Soda-Lime Glass - A process for making soda-lime glass includes calcinating calcium carbonate in solid phase and at elevated temperature to form calcium oxide and release gases such as carbon dioxide. Sodium silicate glass is formed separately in liquid phase while releasing gaseous reaction products. The calcium oxide and the sodium silicate glass intermediate products are mixed in liquid phase to form a soda-lime glass melt. Formation of sodium silicate glass as an intermediate product before mixing with the calcium oxide has the advantage of promoting release of gaseous reaction products in the sodium silicate due at least in part to the relatively low viscosity of the sodium silicate glass. The calcination step and/or the sodium silicate-forming step and/or the final mixing step can be carried out under reduced pressure further to promote release of gases and reduce bubble formation. | 08-30-2012 |
20120324957 | VACUUM DEGASSING APPARATUS AND VACUUM DEGASSING METHOD FOR MOLTEN GLASS - A vacuum degassing apparatus for molten glass is comprised of an uprising pipe, a vacuum degassing vessel, a downfalling pipe, an upstream side pit that supplies molten glass to the uprising pipe, and a downstream side pit that receives molten glass from the downfalling pipe. The vacuum degassing apparatus for molten glass is further comprised of a separating mechanism that separates a part of molten glass moving from the downfalling pipe to the downstream side pit, and a returning pipe that returns separated molten glass to the upstream side pit. | 12-27-2012 |
20130111955 | Process for Melting and Refining Silica-Based Glass - A process for making silica-based glass includes: (a) forming a glass precursor melt that includes glass network formers and glass network modifiers, the glass precursor melt being at a temperature in the range of 900 C to 1700 C and having a viscosity of not more than 3 Pa·s, and (b) refining the glass precursor melt. Either or both steps (a) and (b) can include stirring and/or be carried out under reduced pressure to enhance refining. The refined glass precursor melt preferably is mixed with additional materials including silica (SiO2) to form a silica-based glass melt. | 05-09-2013 |
20130247620 | SILICON REFINING DEVICE AND SILICON REFINING METHOD - A technology for removing impurities from a silicon raw material at a low cost. A base material made of metallurgical silicon is arranged in a dissolution vessel, the base material arranged in the dissolution vessel is heated in a vacuum ambience and fully molten, silicon is solidified from a portion where an inner bottom surface of the dissolution vessel is in contact with molten silicon by cooling the outer bottom surface of the dissolution vessel in a state where the outer bottom surface faces the cooling means, spaced from the cooling means, the solidificated silicon is made to grow upward, and unsolidificated silicon located above the solidificated silicon is removed from the dissolution vessel. | 09-26-2013 |
20140102147 | Process For Melting And Refining Silica-Based Glass - A process for making silica-based glass includes: (a) forming a glass precursor melt that includes glass network formers and glass network modifiers, the glass precursor melt having a viscosity of not more than 30 Pa·s at 1300 C, and (b) refining the glass precursor melt. Either or both steps (a) and (b) can include stirring and/or be carried out under reduced pressure to enhance refining. The refined glass precursor melt preferably is mixed with additional materials including silica (SiO | 04-17-2014 |
20140245793 | Process And Apparatus For Refining Molten Glass - A process and an apparatus for refining molten glass by introducing, a stream of unrefined molten glass into a controlled environment distributing the stream of molten glass over a flow surface, and collecting the stream of molten glass from a downstream end of the flow surface to form a body of molten glass having a free surface exposed to the controlled environment. The controlled environment, may have a pressure less than ambient atmospheric pressure, such that introducing the stream of molten glass into the controlled environment causes gaseous inclusions in the stream of molten glass to rise to a surface thereof and escape. | 09-04-2014 |
20140245794 | MANUFACTURING PROCESS FOR CHALCOGENIDE GLASSES - The present invention is generally directed to a method of making chalcogenide glasses including holding the melt in a vertical furnace to promote homogenization and mixing; slow cooling the melt at less than 10° C. per minute; and sequentially quenching the melt from the top down in a controlled manner. Additionally, the present invention provides for the materials produced by such method. The present invention is also directed to a process for removing oxygen and hydrogen impurities from chalcogenide glass components using dynamic distillation. | 09-04-2014 |
20150075223 | SILICON PURIFICATION APPARATUS AND SILICON PURIFICATION METHOD - Provided are a silicon purification apparatus that uses a ring-shaped thermal-insulating lid, which can be replaced while heating a crucible, as a thermal-insulating means for keeping the surface of a silicon melt at a high temperature, and has a simple structure and is easy to produce, said silicon purification apparatus being capable of continuously processing several tens of portions of charged silicon with the crucible heated as is; a silicon purification method that makes use of the silicon purification apparatus; and a purification method. The present invention pertains to a silicon purification apparatus, which is provided with, inside a depressurization chamber equipped with a vacuum pump, a graphite crucible having an opening at the upper end and accommodating silicon therein, and a heating device for heating said crucible, said silicon purification apparatus being characterized by being provided with a ring-shaped thermal-insulating lid that covers the opening of the crucible at the top of the crucible and has an exhaust opening with an area smaller than the surface of the silicon melt inside the crucible, said thermal-insulating lid being capable of being replaced during heating of the crucible in the decompression chamber. The present invention further pertains to a silicon purification method that makes use of the silicon purification apparatus. | 03-19-2015 |
20150353405 | Process and Apparatus for Refining Molten Glass - A process and an apparatus for refining molten glass that includes a housing having a vertically oriented longitudinal axis and a transverse axis perpendicular to the longitudinal axis. Molten glass is received at an upper end of the housing and is discharged from a lower end of the housing. A guide extends at least partway across the housing and directs molten glass in a generally downward direction through the housing and in a parallel or oblique direction relative to the transverse axis of the housing. | 12-10-2015 |