Patents by Inventor Toshimitsu KUBOKI
Toshimitsu KUBOKI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9896383Abstract: A high zirconia electrically fused cast refractory having long time durability with less cracking during production and in the course of temperature rising, excellent in productivity, less forming zircon crystals in the refractory itself and even in contact with molten glass, excellent in bubble foamability to molten glass, less generating cracks even undergoing heat cycles during operation of a glass melting furnace. A high zirconia electrically fused cast refractory comprises, as chemical component, 85 to 95% by weight of ZrO2, 0.4 to 2.5% by weight of Al2O3, 3.5 to 10.0% by weight of SiO2, 0.05% by weight or more of Na2O, 0.05 to 0.7% by weight of Na2O and K2O in total, 0.01 to 0.04% by weight of B2O3, 0.1 to 3.0% by weight of SrO or BaO when one of BaO and SrO is contained, 0.1% by weight or more of SrO and 0.1 to 3.0% by weight of SrO and BaO in total when both of BaO and SrO are contained, 0.01 to 0.2% by weight of CaO, 0.1% by weight or less of MgO, 0.01 to 0.7% by weight of SnO2, 0.Type: GrantFiled: November 26, 2014Date of Patent: February 20, 2018Assignee: Saint-Gobain TM K.K.Inventors: Hiroshi Sugiyama, Toshimitsu Kuboki, Itaru Hashimoto, Yasuo Misu
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Patent number: 9751806Abstract: A high zirconia electrically fused cast refractory of high electric resistance having long time durability, less suffering from cracking during production and upon temperature rising, excellent in productivity, less forming zircon crystals even upon heating the refractory in itself and when the refractory is in contact with molten glass, generating less cracks even when undergoing heat cycles during operation of a glass melting furnace is provided. A high zirconia electrically fused cast refractory has, as chemical components, 85 to 95% by weight of ZrO2, 0.1 to less than 0.8% by weight of Al2O3, 3.5 to 10.0% by weight of SiO2, less than 0.05% by weight of Na2O and K2O in total, 0.1 to 1.5% by weight of B2O3, 0.1% by weight or less of MgO, 0.01 to 0.2% by weight of CaO, in the case where any one of BaO and SrO is contained, from 0.05 to 3.0% by weight of BaO or 0.01 to 3.0% by weight of SrO, or in the case where both of them are contained, 0.01% by weight or more of SrO and from 0.01% to 3.Type: GrantFiled: March 2, 2015Date of Patent: September 5, 2017Assignee: SAINT-GOBAIN TM K.K.Inventors: Hiroshi Sugiyama, Toshimitsu Kuboki, Itaru Hashimoto, Yasuo Misu
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Publication number: 20170088470Abstract: A high zirconia electrically fused cast refractory having long time durability with less cracking during production and in the course of temperature rising, excellent in productivity, less forming zircon crystals in the refractory itself and even in contact with molten glass, excellent in bubble foamability to molten glass, less generating cracks even undergoing heat cycles during operation of a glass melting furnace. A high zirconia electrically fused cast refractory comprises, as chemical component, 85 to 95% by weight of ZrO2, 0.4 to 2.5% by weight of Al2O3, 3.5 to 10.0% by weight of SiO2, 0.05% by weight or more of Na2O, 0.05 to 0.7% by weight of Na2O and K2O in total, 0.01 to 0.04% by weight of B2O3, 0.1 to 3.0% by weight of SrO or BaO when one of BaO and SrO is contained, 0.1% by weight or more of SrO and 0.1 to 3.0% by weight of SrO and BaO in total when both of BaO and SrO are contained, 0.01 to 0.2% by weight of CaO, 0.1% by weight or less of MgO, 0.01 to 0.7% by weight of SnO2, 0.Type: ApplicationFiled: November 26, 2014Publication date: March 30, 2017Applicant: Saint-Gobain TM K.K.Inventors: Hiroshi Sugiyama, Toshimitsu Kuboki, Itaru Hashimoto, Yasuo Misu
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Publication number: 20160362342Abstract: A high zirconia electrically fused cast refractory of high electric resistance having long time durability, less suffering from cracking during production and upon temperature rising, excellent in productivity, less forming zircon crystals even upon heating the refractory in itself and when the refractory is in contact with molten glass, generating less cracks even when undergoing heat cycles during operation of a glass melting furnace is provided. A high zirconia electrically fused cast refractory has, as chemical components, 85 to 95% by weight of ZrO2, 0.1 to less than 0.8% by weight of Al2O3, 3.5 to 10.0% by weight of SiO2, less than 0.05% by weight of Na2O and K2O in total, 0.1 to 1.5% by weight of B2O3, 0.1% by weight or less of MgO, 0.01 to 0.2% by weight of CaO, in the case where any one of BaO and SrO is contained, from 0.05 to 3.0% by weight of BaO or 0.01 to 3.0% by weight of SrO, or in the case where both of them are contained, 0.01% by weight or more of SrO and from 0.01% to 3.Type: ApplicationFiled: March 2, 2015Publication date: December 15, 2016Applicant: SAINT-GOBAIN TM K.K.Inventors: Hiroshi SUGIYAMA, Toshimitsu KUBOKI, Itaru HASHIMOTO, Yasuo MISU
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Patent number: 9475735Abstract: [Problems] To provide a high zirconia fused cast refractory that suffers less cracks in production and on heating, has excellent productivity, is hard to form zircon crystals with the refractory solely and under conditions where the refractory is in contact with molten glass, is hard to suffer cracks on receiving heat cycles in operation of a glass melting furnace, and has durability for a prolonged period of time. [Solution to Problems] A high zirconia fused cast refractory containing, as chemical components, from 85 to 95% by weight of ZrO2, from 0.4 to 2.5% by weight of Al2O3, from 3.5 to 10% by weight of SiO2, from 0.05 to 1% by weight in total of Na2O and K2O, more than 0.04% by weight and 1% by weight or less of B2O3, 0.02% by weight or less of P2O5, 0.05% by weight or less of MgO, from 0.01 to 0.2% by weight of CaO, in the case where any one of SrO and BaO is contained, from 0.3 to 3% by weight of SrO or more than 0.Type: GrantFiled: August 14, 2014Date of Patent: October 25, 2016Assignee: SAINT-GOBAIN TM K.K.Inventors: Toshimitsu Kuboki, Hiroshi Sugiyama, Yasuo Misu, Itaru Hashimoto
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Publication number: 20160023955Abstract: [Problems] To provide a high zirconia fused cast refractory that suffers less cracks in production and on heating, has excellent productivity, is hard to form zircon crystals with the refractory solely and under conditions where the refractory is in contact with molten glass, is hard to suffer cracks on receiving heat cycles in operation of a glass melting furnace, and has durability for a prolonged period of time. [Solution to Problems] A high zirconia fused cast refractory containing, as chemical components, from 85 to 95% by weight of ZrO2, from 0.4 to 2.5% by weight of Al2O3, from 3.5 to 10% by weight of SiO2, from 0.05 to 1% by weight in total of Na2O and K2O, more than 0.04% by weight and 1% by weight or less of B2O3, 0.02% by weight or less of P2O5, 0.05% by weight or less of MgO, from 0.01 to 0.2% by weight of CaO, in the case where any one of SrO and BaO is contained, from 0.3 to 3% by weight of SrO or more than 0.Type: ApplicationFiled: August 14, 2014Publication date: January 28, 2016Inventors: Toshimitsu KUBOKI, Hiroshi SUGIYAMA, Yasuo MISU, Itaru HASHIMOTO