Patents by Inventor KOHEI OGASAWARA
KOHEI OGASAWARA 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: 11926561Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a compressive stress CS (MPa) on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and DOL50%/DOLzero is 0.30 or more, where DOL50% (?m) is a depth at which the value of the compressive stress is 50% of the CS and DOLzero (?m) is a depth at which the value of the compressive stress is 0 MPa.Type: GrantFiled: August 9, 2018Date of Patent: March 12, 2024Assignee: OHARA INC.Inventors: Toshitaka Yagi, Kohei Ogasawara, Yuki Motoshima, Reika Kojima, Yutaka Yamashita, Naoyuki Goto
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Patent number: 11926559Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and CS×DOLzero, which is a product of the compressive stress CS on the outermost surface and the stress depth DOLzero (?m), is 4.8×104 or more.Type: GrantFiled: January 13, 2023Date of Patent: March 12, 2024Assignee: OHARA INC.Inventors: Toshitaka Yagi, Kohei Ogasawara, Yuki Motoshima, Reika Kojima, Yutaka Yamashita, Naoyuki Goto
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Patent number: 11926554Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, where a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and a central stress CT determined by using curve analysis is 55 to 300 MPa.Type: GrantFiled: January 13, 2023Date of Patent: March 12, 2024Assignee: OHARA INC.Inventors: Toshitaka Yagi, Kohei Ogasawara, Yuki Motoshima, Reika Kojima, Yutaka Yamashita, Naoyuki Goto
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Patent number: 11926562Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, in which, CS is 400 to 1400 MPa and CT×(T?2×DOLzero)/CS×DOLzero is 0.60 or more, where CS (MPa) denotes a compressive stress on an outermost surface of the compressive stress layer, DOLzero (?m) denotes a stress depth of the compressive stress layer at which the compressive stress is 0 MPa, CT (MPa) denotes a central stress determined by curve analysis, and T (?m) denotes a thickness of the substrate.Type: GrantFiled: August 9, 2018Date of Patent: March 12, 2024Assignee: OHARA INC.Inventors: Toshitaka Yagi, Kohei Ogasawara, Yuki Motoshima, Reika Kojima, Yutaka Yamashita, Naoyuki Goto
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Patent number: 11926563Abstract: Provided is a crystallized glass substrate including a surface with a compressive stress layer, in which a gradient A of a surface compressive stress from an outermost surface to a depth of 6 ?m in the compressive stress layer is 50.0 to 110.0 MPa/?m, a gradient B of a surface compressive stress from a depth of (a stress depth DOLzero—10 ?m) to the stress depth DOLzero is 2.5 to 15.0 MPa/?m, where the stress depth DOLzero is a depth of the compressive stress layer at a surface compressive stress of 0 MPa, and a hardness of the outermost surface at an indentation depth of 20 nm is 7.50 to 9.50 GPa.Type: GrantFiled: December 21, 2018Date of Patent: March 12, 2024Assignee: OHARA INC.Inventors: Toshitaka Yagi, Kohei Ogasawara
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Publication number: 20240018029Abstract: To obtain a crystallized glass member having a curved shape and provide a method for producing the same. A method for producing a crystallized glass member having a curved shape, including a deformation step for adjusting the temperature of a plate glass to a first temperature zone from higher than [At+40]° C. to [At+146]° C. or lower, where At is the yield point (° C.) of the plate glass and deforming at least part of the plate glass into a curved shape by external force acting on the plate glass while precipitating crystals from the plate glass.Type: ApplicationFiled: September 27, 2023Publication date: January 18, 2024Inventors: MORIJI NOZAKI, TOSHITAKA YAGI, KOHEI OGASAWARA
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Publication number: 20240010546Abstract: Provided is an inorganic composition article that is hard and highly transparent. The inorganic composition article includes at least one type selected from ?-cristobalite and an ?-cristobalite solid solution as a main crystal phase, has a coloring degree ?80 of 330 to 580 nm at a thickness of 10 mm, and has a Vickers hardness of 620 or more.Type: ApplicationFiled: August 23, 2021Publication date: January 11, 2024Inventors: SAYA KIKKAWA, KOHEI OGASAWARA, TOSHITAKA YAGI
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Patent number: 11807568Abstract: To provide an inorganic composition article containing at least one kind selected from ?-cristobalite and ?-cristobalite solid solution as a main crystal phase, in which by mass % in terms of oxide, a content of a SiO2 component is 50.0% to 75.0%, a content of a Li2O component is 3.0% to 10.0%, a content of an Al2O3 component is 5.0% or more and less than 15.0%, and a total content of the Al2O3 component and a ZrO2 component is 10.0% or more, and a surface compressive stress value is 600 MPa or more.Type: GrantFiled: March 5, 2020Date of Patent: November 7, 2023Assignee: OHARA INC.Inventors: Kohei Ogasawara, Toshitaka Yagi, Nozomu Oda
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Publication number: 20230312402Abstract: Provided are crystallized glass that is easy to process and in which a high compressive stress value can be obtained on a surface, and reinforced crystallized glass thereof. A crystallized glass containing at least one type selected from ?-cristobalite and an ?-cristobalite solid solution as a main crystal phase, in which, by mass % in terms of oxide, a content of a SiO2 component is 50.0% to 75.0%, a content of a Li2O component is 3.0% to 10.0%, a content of an Al2O3 component is 5.0% or more and less than 15.0%, and a content of a B2O3 component is more than 0% and 10.0% or less.Type: ApplicationFiled: August 23, 2021Publication date: October 5, 2023Inventors: SAYA KIKKAWA, KOHEI OGASAWARA, TOSHITAKA YAGI
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Publication number: 20230312401Abstract: Provided is reinforced crystallized glass that has a high strength and is less likely to break. The reinforced crystallized glass includes a compressive stress layer on a surface, and [CS50 ?m*(DOLzero?50)]/2 is 2000 or more, where CS50 ?m (MPa) is a compressive stress at a depth of 50 ?m from an outermost surface, and DOLzero (?m) is a stress depth when the compressive stress is 0 MPa.Type: ApplicationFiled: August 23, 2021Publication date: October 5, 2023Inventors: SAYA KIKKAWA, KOHEI OGASAWARA, TOSHITAKA YAGI
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Publication number: 20230242439Abstract: Reinforced crystallized glass characterized including crystallized glass as a base material, the crystallized glass containing, as expressed in terms of mol % on an oxide basis, 30.0% to 70.0% of an SiO2 component, 8.0% to 25.0% of an Al2O3 component, 2.0% to 25.0% of an Na2O component, 1.0% to 6.0% of an Li2O component, 0 % to 25.0% of an MgO component, 0% to 30.0% of a ZnO component, and 0% to 10.0% of a TiO2 component, in which a surface of the reinforced crystallized glass is formed with a compressive stress layer, and a depth (DOLzero) of the compressive stress layer is 60 ?m or more.Type: ApplicationFiled: June 7, 2021Publication date: August 3, 2023Inventors: KOHEI OGASAWARA, TOSHITAKA YAGI
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Publication number: 20230159384Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and CS×DOLzero, which is a product of the compressive stress CS on the outermost surface and the stress depth DOLzero (?m), is 4.8×104 or more.Type: ApplicationFiled: January 13, 2023Publication date: May 25, 2023Inventors: TOSHITAKA YAGI, KOHEI OGASAWARA, YUKI MOTOSHIMA, REIKA KOJIMA, YUTAKA YAMASHITA, NAOYUKI GOTO
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Publication number: 20230150865Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, where a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and a central stress CT determined by using curve analysis is 55 to 300 MPa.Type: ApplicationFiled: January 13, 2023Publication date: May 18, 2023Inventors: TOSHITAKA YAGI, KOHEI OGASAWARA, YUKI MOTOSHIMA, REIKA KOJIMA, YUTAKA YAMASHITA, NAOYUKI GOTO
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Patent number: 11584685Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and CS×DOLzero, which is a product of the compressive stress CS on the outermost surface and the stress depth DOLzero (?m), is 4.8×104 or more.Type: GrantFiled: August 9, 2018Date of Patent: February 21, 2023Assignee: OHARA INC.Inventors: Toshitaka Yagi, Kohei Ogasawara, Yuki Motoshima, Reika Kojima, Yutaka Yamashita, Naoyuki Goto
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Patent number: 11577989Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, where a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and a central stress CT determined by using curve analysis is 55 to 300 MPa.Type: GrantFiled: August 9, 2018Date of Patent: February 14, 2023Assignee: OHARA INC.Inventors: Toshitaka Yagi, Kohei Ogasawara, Yuki Motoshima, Reika Kojima, Yutaka Yamashita, Naoyuki Goto
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Publication number: 20220324749Abstract: Crystallized glass and strengthened crystallized glass with a novel composition, which have a high refractive index and high hardness, are provided. A crystallized glass, including, by mass % in terms of oxide, 20.0% or more and less than 40.0% of a SiO2 component, more than 0% and 20.0% or less of a Rn2O component, where Rn is one or more selected from Li, Na, and K, 7.0% to 25.0% of an Al2O3 component, 0% to 25.0% of a MgO component, 0% to 45.0% of a ZnO component, and 0% to 20.0% of a Ta2O5 component, in which a total amount of the MgO component, the ZnO component, and the Ta2O5 component is 10.0% or more.Type: ApplicationFiled: August 19, 2020Publication date: October 13, 2022Inventors: KEISUKE SHIMAMURA, TOSHITAKA YAGI, KOHEI OGASAWARA
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Publication number: 20220259094Abstract: To provide an inorganic composition article containing at least one kind selected from ?-cristobalite and ?-cristobalite solid solution as a main crystal phase, in which by mass % in terms of oxide, a content of a SiO2 component is 50.0% to 75.0%, a content of a Li2O component is 3.0% to 10.0%, a content of an Al2O3 component is 5.0% or more and less than 15.0%, and a total content of the Al2O3 component and a ZrO2 component is 10.0% or more, and a surface compressive stress value is 600 MPa or more.Type: ApplicationFiled: May 2, 2022Publication date: August 18, 2022Inventors: KOHEI OGASAWARA, TOSHITAKA YAGI, NOZOMU ODA
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Publication number: 20220144691Abstract: To provide an inorganic composition article containing at least one kind selected from ?-cristobalite and ?-cristobalite solid solution as a main crystal phase, in which by mass % in terms of oxide, a content of a SiO2 component is 50.0% to 75.0%, a content of a Li2O component is 3.0% to 10.0%, a content of an Al2O3 component is 5.0% or more and less than 15.0%, and a total content of the Al2O3 component and a ZrO2 component is 10.0% or more, and a surface compressive stress value is 600 MPa or more.Type: ApplicationFiled: March 5, 2020Publication date: May 12, 2022Inventors: KOHEI OGASAWARA, TOSHITAKA YAGI, NOZOMU ODA
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Publication number: 20220024802Abstract: Provided is a crystallized glass substrate including a surface with a compressive stress layer, in which a gradient A of a surface compressive stress from an outermost surface to a depth of 6 ?m in the compressive stress layer is 50.0 to 110.0 MPa/?m, a gradient B of a surface compressive stress from a depth of (a stress depth DOLzero—10 ?m) to the stress depth DOLzero is 2.5 to 15.0 MPa/?m, where the stress depth DOLzero is a depth of the compressive stress layer at a surface compressive stress of 0 MPa, and a hardness of the outermost surface at an indentation depth of 20 nm is 7.50 to 9.50 GPa.Type: ApplicationFiled: December 21, 2018Publication date: January 27, 2022Inventors: TOSHITAKA YAGI, KOHEI OGASAWARA
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Publication number: 20210300818Abstract: To provide a crystallized glass substrate including a surface with a compressive stress layer, in which a stress depth DOLzero of the compressive stress layer, at which the compressive stress is 0 MPa, is 45 to 200 ?m, a compressive stress CS on an outermost surface of the compressive stress layer is 400 to 1400 MPa, and CS×DOLzero, which is a product of the compressive stress CS on the outermost surface and the stress depth DOLzero(?m), is 4.8×104 or more.Type: ApplicationFiled: August 9, 2018Publication date: September 30, 2021Inventors: TOSHITAKA YAGI, KOHEI OGASAWARA, YUKI MOTOSHIMA, REIKA KOJIMA, YUTAKA YAMASHITA, NAOYUKI GOTO