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).

  • Publication number: 20240188452
    Abstract: A joined body includes: a first superconducting layer, a barrier layer arranged on the first superconducting layer, and a second superconducting layer arranged on the barrier layer. The first superconducting layer, the barrier layer, and the second superconducting layer are formed of a REBCO. A leak current from one of the first superconducting layer and the second superconducting layer to the other of the first superconducting layer and the second superconducting layer is blocked by the barrier layer.
    Type: Application
    Filed: January 6, 2022
    Publication date: June 6, 2024
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kotaro OHKI, Tatsuoki NAGAISHI
  • Patent number: 11980106
    Abstract: A persistent current switch includes a superconducting wire including a substrate and a superconducting layer disposed on the substrate, and a heater. The superconducting wire includes a surface including a first portion and a second portion that are disposed apart from each other along a longitudinal direction of the superconducting wire. The first portion and the second portion face each other. The heater is sandwiched between the first portion and the second portion.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: May 7, 2024
    Assignees: Sumitomo Electric Industries, Ltd., RIKEN, Japan Superconductor Technology, Inc.
    Inventors: Takashi Yamaguchi, Kotaro Ohki, Tatsuoki Nagaishi, Yoshinori Yanagisawa, Mamoru Hamada
  • Patent number: 11972898
    Abstract: A superconducting magnet according to one embodiment includes: a coil including a superconducting layer having a first portion and a second portion, and a joining portion; and a cryostat in which the coil is stored. The first portion and the second portion are located in a termination portion. The superconducting layer forms a closed loop by superconducting joining of the first portion and the second portion at the joining portion. The superconducting layer is made of a high-temperature superconductor. A current flows through the joining portion in a superconducting state when a magnetic field equal to or greater than 1.0 tesla and equal to or less than 5.0 tesla is applied to the joining portion at 77 kelvin. The cryostat is configured such that a temperature inside the cryostat is equal to or greater than 2.0 kelvin and equal to or less than 77 kelvin.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: April 30, 2024
    Assignees: RIKEN, Sumitomo Electric Industries, Ltd.
    Inventors: Hideaki Maeda, Yoshinori Yanagisawa, Kotaro Ohki, Tatsuoki Nagaishi
  • Publication number: 20240038427
    Abstract: A superconducting coil device according to one embodiment of the present invention includes: A superconducting coil device including: a bobbin having a tubular body; superconducting wires, a part of which constitutes a wound portion where the superconducting wires are wound on the bobbin; a bobbin-side guide portion holding the superconducting wires extending from the bobbin, the bobbin-side guide portion being provided to extend in a bobbin axial direction, which is an axial direction of the body of the bobbin; a first guide portion holding the superconducting wires extending from the bobbin-side guide portion, the first guide portion being arranged on an outer side of the bobbin-side guide portion in a direction intersecting the bobbin axial direction and provided to extend in the direction intersecting the bobbin axial direction; and a second guide portion capable of holding the superconducting wires extending from the first guide portion, the second guide portion being provided to extend in a direction in
    Type: Application
    Filed: October 11, 2021
    Publication date: February 1, 2024
    Applicants: JAPAN SUPERCONDUCTOR TECHNOLOGY INC., RIKEN, SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masatoshi YOSHIKAWA, Yasuyuki MIYOSHI, Mamoru HAMADA, Kazuyoshi SAITO, Yoshinori YANAGISAWA, Renzhong PIAO, Kotaro OHKI, Takashi YAMAGUCHI, Tatsuoki NAGAISHI
  • Patent number: 11715586
    Abstract: In a superconducting wire, a superconducting material joining layer joins a first end portion of a first superconducting material layer of a first wire and a second end portion of a second superconducting material layer of a second wire. The first wire and the second wire are disposed such that a first end face and a second end face are positioned to face in the same direction. The first wire further includes a first conductor layer disposed on the first main surface so as to be located adjacent to the first end portion. The second wire further includes a second conductor layer disposed on the second main surface so as to be located adjacent to the second end portion. The first conductor layer and the second conductor layer are connected to each other.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: August 1, 2023
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kotaro Ohki, Tatsuoki Nagaishi
  • Publication number: 20220393680
    Abstract: A persistent current switch includes a superconducting wire, a heater, and an insulating member. The superconducting wire includes a substrate and a superconducting layer provided on the substrate. The superconducting layer includes a first principal surface facing the substrate and a second principal surface on an opposite side of the first principal surface. The heater is disposed only on the second principal surface side with respect to the superconducting layer. The insulating member is provided between the second principal surface of the superconducting layer and the heater.
    Type: Application
    Filed: June 25, 2020
    Publication date: December 8, 2022
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi YAMAGUCHI, Kotaro OHKI, Tatsuoki NAGAISHI
  • Publication number: 20220351880
    Abstract: A superconducting wire holding structure includes a holding member made of a first material, a superconducting wire disposed inside the holding member, and a filler made of a second material different from the first material. The superconducting wire includes a substrate, an intermediate layer formed on the substrate, a superconducting layer formed on the intermediate layer, and a first protective layer and a second protective layer that are formed on the superconducting layer. The superconducting layer includes a first portion, a second portion, and a third portion between the first portion and the second portion along a longitudinal direction of the superconducting wire. The first protective layer is formed on the first portion, and the second protective layer is formed on the second portion. The filler is filled between the third portion and the holding member.
    Type: Application
    Filed: August 31, 2020
    Publication date: November 3, 2022
    Applicants: Sumitomo Electric Industries, Ltd., RIKEN, Japan Superconductor Technology, Inc.
    Inventors: Takashi YAMAGUCHI, Kotaro OHKI, Tatsuoki NAGAISHI, Yoshinori YANAGISAWA, Mamoru HAMADA
  • Publication number: 20220344564
    Abstract: A persistent current switch includes a superconducting wire including a substrate and a superconducting layer disposed on the substrate, and a heater. The superconducting wire includes a surface including a first portion and a second portion that are disposed apart from each other along a longitudinal direction of the superconducting wire. The first portion and the second portion face each other. The heater is sandwiched between the first portion and the second portion.
    Type: Application
    Filed: August 31, 2020
    Publication date: October 27, 2022
    Applicants: Sumitomo Electric Industries, Ltd., RIKEN, Japan Superconductor Technology, Inc.
    Inventors: Takashi YAMAGUCHI, Kotaro OHKI, Tatsuoki NAGAISHI, Yoshinori YANAGISAWA, Mamoru HAMADA
  • Publication number: 20220115167
    Abstract: According to an embodiment, a superconducting wire includes a substrate, an intermediate layer formed on the substrate, a superconducting layer formed on the intermediate layer, and a protective layer formed on the superconducting layer. The superconducting layer has a first portion, a second portion, and a third portion between the first portion and the second portion in the longitudinal direction of the superconducting wire. The protective layer on the third portion is at least partially removed.
    Type: Application
    Filed: December 4, 2019
    Publication date: April 14, 2022
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi YAMAGUCHI, Kotaro OHKI, Tatsuoki NAGAISHI
  • Patent number: 11264151
    Abstract: 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: Grant
    Filed: September 18, 2019
    Date of Patent: March 1, 2022
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Yamaguchi, Tatsuoki Nagaishi, Masaya Konishi, Kotaro Ohki, Genki Honda, Tatsuhiko Yoshihara
  • Publication number: 20210090769
    Abstract: In a superconducting wire, a superconducting material joining layer joins a first end portion of a first superconducting material layer of a first wire and a second end portion of a second superconducting material layer of a second wire. The first wire and the second wire are disposed such that a first end face and a second end face are positioned to face in the same direction. The first wire further includes a first conductor layer disposed on the first main surface so as to be located adjacent to the first end portion. The second wire further includes a second conductor layer disposed on the second main surface so as to be located adjacent to the second end portion. The first conductor layer and the second conductor layer are connected to each other.
    Type: Application
    Filed: May 19, 2017
    Publication date: March 25, 2021
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Kotaro OHKI, Tatsuoki NAGAISHI
  • Patent number: 10886040
    Abstract: 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: Grant
    Filed: May 19, 2017
    Date of Patent: January 5, 2021
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Tatsuoki Nagaishi, Kotaro Ohki
  • Patent number: 10748678
    Abstract: 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: Grant
    Filed: October 23, 2015
    Date of Patent: August 18, 2020
    Assignees: Toyo Kohan Co., Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Teppei Kurokawa, Yusuke Hashimoto, Hironao Okayama, Tatsuoki Nagaishi, Kotaro Ohki, Genki Honda
  • Patent number: 10706991
    Abstract: 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: Grant
    Filed: February 3, 2016
    Date of Patent: July 7, 2020
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kotaro Ohki, Tatsuoki Nagaishi
  • Publication number: 20200194155
    Abstract: A superconducting wire has a tape-like shape, and includes a superconducting layer. An amount of heat required to raise temperature from 77 K to 300 K, for a unit region having a length of 1 m and a width of 4 mm in the superconducting wire, is more than or equal to 200 J and less than or equal to 500 J.
    Type: Application
    Filed: May 22, 2017
    Publication date: June 18, 2020
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Genki HONDA, Tatsuoki NAGAISHI, Masaya KONISHI, Kotaro OHKI, Takashi YAMAGUCHI, Yoshihiro HONDA, Tatsuhiko YOSHIHARA
  • Patent number: 10665367
    Abstract: 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: Grant
    Filed: July 12, 2016
    Date of Patent: May 26, 2020
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Genki Honda, Tatsuoki Nagaishi, Masaya Konishi, Kotaro Ohki, Takashi Yamaguchi, Tatsuhiko Yoshihara
  • Publication number: 20200111589
    Abstract: 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: Application
    Filed: September 18, 2019
    Publication date: April 9, 2020
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi YAMAGUCHI, Tatsuoki NAGAISHI, Masaya KONISHI, Kotaro OHKI, Genki HONDA, Tatsuhiko YOSHIHARA
  • Publication number: 20200098491
    Abstract: A superconducting wire includes: a first wire including a first superconducting material layer having a first main surface; a second wire including a second superconducting material layer having a second main surface; a third wire including a third superconducting material layer having a third main surface; a first superconducting material joining layer that joins the first main surface to the second main surface; and a second superconducting material joining layer that joins the second main surface to the third main surface. The first wire has a first end surface. The third wire has a second end surface. The second end surface faces the first end surface with a space being interposed between the second end surface and the first end surface. The space is more than or equal to 10 nm and less than 1 mm.
    Type: Application
    Filed: May 19, 2017
    Publication date: March 26, 2020
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Kotaro OHKI, Tatsuoki NAGAISHI, Takashi YAMAGUCHI
  • Publication number: 20200082960
    Abstract: A superconducting wire includes a metal substrate, an intermediate layer on the metal substrate, a superconducting material layer on the intermediate layer, and a cover layer on the superconducting material layer. The cover layer includes a protective layer on the superconducting material layer. A first stack formed by the intermediate layer and the superconducting material layer has a breakdown voltage of 1.1 V or greater.
    Type: Application
    Filed: December 16, 2016
    Publication date: March 12, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kotaro OHKI, Genki HONDA
  • Publication number: 20200075207
    Abstract: A superconducting magnet according to one embodiment includes: a coil including a superconducting layer having a first portion and a second portion, and a joining portion; and a cryostat in which the coil is stored. The first portion and the second portion are located in a termination portion. The superconducting layer forms a closed loop by superconducting joining of the first portion and the second portion at the joining portion. The superconducting layer is made of a high-temperature superconductor. A current flows through the joining portion in a superconducting state when a magnetic field equal to or greater than 1.0 tesla and equal to or less than 5.0 tesla is applied to the joining portion at 77 kelvin. The cryostat is configured such that a temperature inside the cryostat is equal to or greater than 2.0 kelvin and equal to or less than 77 kelvin.
    Type: Application
    Filed: March 9, 2018
    Publication date: March 5, 2020
    Applicants: RIKEN, Sumitomo Electric Industries, Ltd.
    Inventors: Hideaki MAEDA, Yoshinori YANAGISAWA, Kotaro OHKI, Tatsuoki NAGAISHI