Patents by Inventor Kotaro Ohki
Kotaro Ohki 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).
-
Patent number: 10497494Abstract: A superconducting wire includes: a substrate having a first main surface and a second main surface opposite to the first main surface; and a superconducting material layer disposed on the first main surface of the substrate. The superconducting material layer is disposed to cover at least a part of a side surface of the substrate in a width direction of the substrate.Type: GrantFiled: March 16, 2015Date of Patent: December 3, 2019Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Takashi Yamaguchi, Tatsuoki Nagaishi, Masaya Konishi, Kotaro Ohki, Genki Honda, Tatsuhiko Yoshihara
-
Patent number: 10460854Abstract: A superconducting wire includes a multilayer stack and a covering layer (stabilizing layer or protective layer). The multilayer stack includes a substrate having a main surface and a superconducting material layer formed on the main surface. The covering layer (stabilizing layer or protective layer) is disposed on at least the superconducting material layer. A front surface portion of the covering layer (stabilizing layer or protective layer) located on the superconducting material layer (front surface portion of the stabilizing layer or upper surface of the protective layer) has a concave shape.Type: GrantFiled: March 16, 2015Date of Patent: October 29, 2019Assignee: Sumitomo Electric Industries, Ltd.Inventors: Takashi Yamaguchi, Tatsuoki Nagaishi, Masaya Konishi, Kotaro Ohki, Genki Honda, Tatsuhiko Yoshihara
-
Publication number: 20190304634Abstract: A superconducting wire includes a stack which includes: a first substrate having a first primary surface; a second substrate disposed opposite the first substrate; and a first superconducting material layer between the first primary surface and the second substrate. A ratio w/h of a width w of the superconducting wire to a height h of the superconducting wire in a cross section perpendicular to the longitudinal direction of the superconducting wire is 0.8 or greater and 10 or less. The width w is 2 mm or less.Type: ApplicationFiled: May 19, 2017Publication date: October 3, 2019Applicant: Sumitomo Electric Industries, Ltd.Inventors: Tatsuoki NAGAISHI, Kotaro OHKI
-
Patent number: 10174420Abstract: This invention provides a method for forming an oxide layer on a metal substrate, which enables manufacture of an oxide layer with improved crystal orientation in comparison with that of the outermost layer of a metal substrate. The method for forming an oxide layer on a metal substrate 20 via RF magnetron sputtering comprises a step of subjecting the crystal-oriented metal substrate 20 exhibiting a c-axis orientation of 99% on its outermost layer to RF magnetron sputtering while adjusting the angle ? formed by a perpendicular at a film formation position 20a on the metal substrate 20 and a line from the film formation position 20a to a point 10a at which the perpendicular magnetic flux density is zero on the target 10 located at the position nearest to the film formation position 20a to 15 degrees or less.Type: GrantFiled: August 25, 2014Date of Patent: January 8, 2019Assignee: Toyo Kohan Co., Ltd.Inventors: Yusuke Hashimoto, Teppei Kurokawa, Takashi Koshiro, Hironao Okayama, Tatsuoki Nagaishi, Kotaro Ohki, Genki Honda
-
Publication number: 20180301248Abstract: An oxide superconducting wire includes an oriented metal substrate, an intermediate layer formed on the oriented metal substrate, and an oxide superconducting layer formed on the intermediate layer. The oriented metal substrate has an in-plane orientation ?? of 7° or less. The intermediate layer is formed of a single layer.Type: ApplicationFiled: July 12, 2016Publication date: October 18, 2018Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Genki HONDA, Tatsuoki NAGAISHI, Masaya KONISHI, Kotaro OHKI, Takashi YAMAGUCHI, Tatsuhiko YOSHIHARA
-
Patent number: 9978481Abstract: An oxide superconducting thin film wire includes a metal substrate, a laminate, and a Cu stabilizing layer. The metal substrate includes a supporting base material and a conductive layer located on the supporting base material. The conductive layer includes a Cu layer serving as an internal layer and a biaxially orientated surface layer. The laminate includes a buffer layer, an oxide superconducting layer, and a Ag stabilizing layer stacked on the metal substrate in this order from the metal substrate. The Cu stabilizing layer is formed so as to surround the laminate and the metal substrate. At least one of the Cu stabilizing layer and the Ag stabilizing layer is formed so as to be in contact with at least a portion of the conductive layer of the metal substrate and be electrically conductive with the conductive layer of the metal substrate.Type: GrantFiled: March 4, 2015Date of Patent: May 22, 2018Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Takashi Yamaguchi, Tatsuoki Nagaishi, Masaya Konishi, Kotaro Ohki, Genki Honda
-
Publication number: 20180025812Abstract: There is provided a technique for producing a superconducting wire material in which the yield in a process of joining superconducting wire materials is improved over the related art. A method for producing a superconducting wire material lengthened by joining end portions of superconducting wire materials each having an oxide superconducting film, the end portions serving as joining surfaces, includes a step of disposing a micro-crystal of an oxide superconducting material on each of the joining surfaces of the oxide superconducting films, a pasting step of overlapping and pasting together the joining surfaces on which the micro-crystal is disposed, and a heat joining step of heating the overlapped joining surfaces to grow the micro-crystal, thereby forming, as a joining layer, a superconducting layer of the oxide superconducting material to join the joining surfaces to each other.Type: ApplicationFiled: February 3, 2016Publication date: January 25, 2018Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Kotaro OHKI, Tatsuoki NAGAISHI
-
Publication number: 20170338008Abstract: This invention provides a substrate for a superconducting wire used for manufacturing a superconducting wire with excellent superconductivity and a method for manufacturing the same. Such substrate for a superconducting wire exhibits the crystal orientation of metals on the outermost layer, such as a c-axis orientation rate of 99% or higher, a ?? of 6 degrees or less, and a percentage of an area in which the crystal orientation is deviated by 6 degrees or more from the (001) [100] per unit area of 6% or less.Type: ApplicationFiled: October 23, 2015Publication date: November 23, 2017Applicants: Toyo Kohan Co., Ltd., Sumitomo Electric Industries, Ltd.Inventors: Teppei Kurokawa, Yusuki Hashimoto, Hironao Okayama, Tatsuoki Nagaishi, Kotaro Ohki, Genki Honda
-
Publication number: 20170140852Abstract: A superconducting wire includes: a substrate having a first main surface and a second main surface opposite to the first main surface; and a superconducting material layer disposed on the first main surface of the substrate. The superconducting material layer is disposed to cover at least a part of a side surface of the substrate in a width direction of the substrate.Type: ApplicationFiled: March 16, 2015Publication date: May 18, 2017Applicant: Sumitomo Electric Industries, Ltd.Inventors: Takashi YAMAGUCHI, Tatsuoki NAGAISHI, Masaya KONISHI, Kotaro OHKI, Genki HONDA, Tatsuhiko YOSHIHARA
-
Publication number: 20170133127Abstract: A superconducting wire includes a multilayer stack and a covering layer (stabilizing layer or protective layer). The multilayer stack includes a substrate having a main surface and a superconducting material layer formed on the main surface. The covering layer (stabilizing layer or protective layer) is disposed on at least the superconducting material layer. A front surface portion of the covering layer (stabilizing layer or protective layer) located on the superconducting material layer (front surface portion of the stabilizing layer or upper surface of the protective layer) has a concave shape.Type: ApplicationFiled: March 16, 2015Publication date: May 11, 2017Applicant: Sumitomo Electric Industries, Ltd.Inventors: Takashi YAMAGUCHI, Tatsuoki NAGAISHI, Masaya KONISHI, Kotaro OHKI, Genki HONDA, Tatsuhiko YOSHIHARA
-
Publication number: 20170011824Abstract: An oxide superconducting thin film wire includes a metal substrate, a laminate, and a Cu stabilizing layer. The metal substrate includes a supporting base material and a conductive layer located on the supporting base material. The conductive layer includes a Cu layer serving as an internal layer and a biaxially orientated surface layer. The laminate includes a buffer layer, an oxide superconducting layer, and a Ag stabilizing layer stacked on the metal substrate in this order from the metal substrate. The Cu stabilizing layer is formed so as to surround the laminate and the metal substrate. At least one of the Cu stabilizing layer and the Ag stabilizing layer is formed so as to be in contact with at least a portion of the conductive layer of the metal substrate and be electrically conductive with the conductive layer of the metal substrate.Type: ApplicationFiled: March 4, 2015Publication date: January 12, 2017Inventors: Takashi YAMAGUCHI, Tatsuoki NAGAISHI, Masaya KONISHI, Kotaro OHKI, Genki HONDA
-
Publication number: 20160194750Abstract: This invention provides a method for forming an oxide layer on a metal substrate, which enables manufacture of an oxide layer with improved crystal orientation in comparison with that of the outermost layer of a metal substrate. The method for forming an oxide layer on a metal substrate 20 via RF magnetron sputtering comprises a step of subjecting the crystal-oriented metal substrate 20 exhibiting a c-axis orientation of 99% on its outermost layer to RF magnetron sputtering while adjusting the angle ? formed by a perpendicular at a film formation position 20a on the metal substrate 20 and a line from the film formation position 20a to a point 10a at which the perpendicular magnetic flux density is zero on the target 10 located at the position nearest to the film formation position 20a to 15 degrees or less.Type: ApplicationFiled: August 25, 2014Publication date: July 7, 2016Applicant: Toyo Kohan Co., Ltd.Inventors: Yusuke Hashimoto, Teppei Kurokawa, Takashi Koshiro, Hironao Okayama, Tatsuoki Nagaishi, Kotaro Ohki, Genki Honda
-
Patent number: 9082530Abstract: A superconducting thin film material exhibiting excellent superconducting properties and a method of manufacturing the same are provided. A superconducting thin film material includes a substrate, and a superconducting film formed on the substrate. The superconducting film includes an MOD layer formed by an MOD process, and a gas-phase-formed layer formed on the MOD layer by a gas-phase process. Since the MOD layer is formed first and then the gas-phase-formed layer is formed in this manner, degradation of the properties of the gas-phase-formed layer due to heat treatment in the step of forming the MOD layer (heat treatment in the MOD process) can be prevented.Type: GrantFiled: May 9, 2012Date of Patent: July 14, 2015Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Kei Hanafusa, Genki Honda, Kotaro Ohki, Tsuyoshi Nakanishi, Takahiro Taneda, Tatsuoki Nagaishi
-
Patent number: 8993064Abstract: Provided are a substrate for a superconducting compound and a method for manufacturing the substrate which can realize the excellent adhesive strength simultaneously with high orientation of copper. An absorbed material on a surface of a copper foil to which rolling is applied at a draft of 90% or more is removed by applying sputter etching to the surface of the copper foil, sputter etching is applied to a nonmagnetic metal sheet, the copper foil and the metal sheet are bonded to each other by applying a pressure to the copper foil and the metal sheet using reduction rolls, crystals of the copper in the copper foil are oriented by heating a laminated body formed by such bonding, copper is diffused into the metal sheet by heating with a copper diffusion distance of 10 nm or more, and a protective layer is laminated to a surface of the copper foil of the laminated body.Type: GrantFiled: November 12, 2010Date of Patent: March 31, 2015Assignees: Toyo Kohan Co., Ltd., Sumitomo Electric Industries, Ltd.Inventors: Hironao Okayama, Kouji Nanbu, Akira Kaneko, Hajime Ota, Kotaro Ohki, Takashi Yamaguchi, Kazuhiko Hayashi, Kazuya Ohmatsu
-
Patent number: 8815777Abstract: A metal laminated substrate for an oxide superconducting wire is produced by removing, in a state where a copper foil to which rolling is applied at a draft of 90% or more is held at a temperature below a recrystallization temperature, an absorbed material on a surface of the copper foil by applying sputter etching to the surface of the copper foil; removing an absorbed material on a surface of a nonmagnetic metal sheet by applying sputter etching to the surface of the nonmagnetic metal sheet; bonding the copper foil and the metal sheet to each other by reduction rolls at an applied pressure of 300 MPa to 1500 MPa; orienting crystals of the copper by heating a laminated body obtained by bonding at a crystal orientation temperature of copper or above; and forming a protective layer on a copper-side surface of the laminated body by coating.Type: GrantFiled: July 8, 2010Date of Patent: August 26, 2014Assignees: Toyo Kohan Co., Ltd., Sumitomo Electric Industries, Ltd.Inventors: Hironao Okayama, Teppei Kurokawa, Kouji Nanbu, Yoshihiko Isobe, Takashi Koshiro, Akira Kaneko, Hajime Ota, Kotaro Ohki, Takashi Yamaguchi, Kazuya Ohmastu
-
Publication number: 20140038829Abstract: A superconducting thin film material exhibiting excellent superconducting properties and a method of manufacturing the same are provided. A superconducting thin film material includes a substrate, and a superconducting film formed on the substrate. The superconducting film includes an MOD layer formed by an MOD process, and a gas-phase-formed layer formed on the MOD layer by a gas-phase process. Since the MOD layer is formed first and then the gas-phase-formed layer is formed in this manner, degradation of the properties of the gas-phase-formed layer due to heat treatment in the step of forming the MOD layer (heat treatment in the MOD process) can be prevented.Type: ApplicationFiled: May 9, 2012Publication date: February 6, 2014Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Kei Hanafusa, Genki Honda, Kotaro Ohki, Tsuyoshi Nakanishi, Takahiro Taneda, Tatsuoki Nagaishi
-
Publication number: 20130040821Abstract: Provided are a substrate for a superconducting compound and a method for manufacturing the substrate which can realize the excellent adhesive strength simultaneously with high orientation of copper. An absorbed material on a surface of a copper foil to which rolling is applied at a draft of 90% or more is removed by applying sputter etching to the surface of the copper foil, sputter etching is applied to a nonmagnetic metal sheet, the copper foil and the metal sheet are bonded to each other by applying a pressure to the copper foil and the metal sheet using reduction rolls, crystals of the copper in the copper foil are oriented by heating a laminated body formed by such bonding, copper is diffused into the metal sheet by heating with a copper diffusion distance of lOnm or more, and a protective layer is laminated to a surface of the copper foil of the laminated body.Type: ApplicationFiled: November 12, 2010Publication date: February 14, 2013Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., TOYO KOHAN CO., LTD.Inventors: Hironao Okayama, Kouji Nanbu, Akira Kaneko, Hajime Ota, Kotaro Ohki, Takashi Yamaguchi, Kazuhiko Hayashi, Kazuya Ohmatsu
-
Publication number: 20120208703Abstract: A metal laminated substrate for an oxide superconducting wire is produced by removing, in a state where a copper foil to which rolling is applied at a draft of 90% or more is held at a temperature below a recrystallization temperature, an absorbed material on a surface of the copper foil by applying sputter etching to the surface of the copper foil; removing an absorbed material on a surface of a nonmagnetic metal sheet by applying sputter etching to the surface of the nonmagnetic metal sheet; bonding the copper foil and the metal sheet to each other by reduction rolls at an applied pressure of 300 MPa to 1500 MPa; orienting crystals of the copper by heating a laminated body obtained by bonding at a crystal orientation temperature of copper or above; and forming a protective layer on a copper-side surface of the laminated body by coating.Type: ApplicationFiled: July 8, 2010Publication date: August 16, 2012Applicants: Sumitomo Electric Industries, Ltd., Toyo Kohan Co., Ltd.Inventors: Hironao Okayama, Teppei Kurokawa, Kouji Nanbu, Yoshihiko Isobe, Takashi Koshiro, Akira Kaneko, Hajime Ota, Kotaro Ohki, Takashi Yamaguchi, Kazuya Ohmastu