Patents by Inventor Tomohiro Otsuka

Tomohiro Otsuka 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: 20240037315
    Abstract: A transistor characteristics simulation device uses a transistor equivalent circuit model, in which the transistor equivalent circuit model includes a trap equivalent circuit for modifying a level of a trap of a transistor by an electric field intensity, the trap equivalent circuit corresponding to a physical model of Poole-Frenkel effect.
    Type: Application
    Filed: October 10, 2023
    Publication date: February 1, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tomohiro OTSUKA, Yutaro YAMAGUCHI, Koji YAMANAKA
  • Patent number: 11668394
    Abstract: In a piston including a plurality of piston rings, a state where a difference in differential pressure between the piston rings is eased is maintained even after passage of time, and the life of the piston rings is extended. A piston includes a piston body in which a plurality of ring grooves is formed, and a plurality of piston rings respectively arranged in the ring grooves. In the piston, a leakage groove is formed on a low-pressure side surface of the ring groove, and in a state where the piston ring is abutted with the low-pressure side surface while being abutted with a cylinder, the leakage groove ensures communication between a high-pressure side space and a low-pressure side space with respect to the piston ring.
    Type: Grant
    Filed: June 13, 2022
    Date of Patent: June 6, 2023
    Assignee: KOBE STEEL, LTD.
    Inventors: Shunsuke Morinaka, Toru Okada, Tomohiro Otsuka
  • Publication number: 20230034137
    Abstract: In a piston including a plurality of piston rings, a state where a difference in differential pressure between the piston rings is eased is maintained even after passage of time, and the life of the piston rings is extended. A piston includes a piston body in which a plurality of ring grooves is formed, and a plurality of piston rings respectively arranged in the ring grooves. In the piston, a leakage groove is formed on a low-pressure side surface of the ring groove, and in a state where the piston ring is abutted with the low-pressure side surface while being abutted with a cylinder, the leakage groove ensures communication between a high-pressure side space and a low-pressure side space with respect to the piston ring.
    Type: Application
    Filed: June 13, 2022
    Publication date: February 2, 2023
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Shunsuke MORINAKA, Toru OKADA, Tomohiro OTSUKA
  • Patent number: 11505221
    Abstract: A floating caliper brake device for a railroad vehicle includes: a support pin that is supported by a cylindrical portion of a support frame in such a manner as to be slidable in a direction X; a caliper; a first and second brake shoe; a pressurizing device that moves the first brake shoe back and forth; an elastic member that is expandable and contractible in the direction X; a stopper member that is immovable relatively to the cylindrical portion in the direction X; and a moving member that is frictionally engaged with the support pin so as to be slidable in the direction X.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: November 22, 2022
    Assignees: NIPPON STEEL CORPORATION, CENTRAL JAPAN RAILWAY COMPANY
    Inventors: Kousuke Sakaguchi, Kazuaki Fujita, Masanori Sawada, Hironori Yokota, Tomohiro Otsuka, Jun Asano, Masashi Sekiya, Seiji Kanamori
  • Publication number: 20220196151
    Abstract: The piston ring unit includes a plurality of piston rings and an inner contact ring. A plurality of piston rings are disposed adjacent to each other in an axial direction of the piston such that joints of plurality of the piston rings do not overlap with each other in the axial direction. An inner contact ring is interposed between an outer circumferential surface of the piston and an inner circumferential surface of the piston ring in a state where the inner contact ring extends over all of the plurality of piston rings in the axial direction, and is disposed such that an opening of the inner contact ring does not overlap with the joint of the at least one piston ring as viewed in a radial direction of the piston.
    Type: Application
    Filed: November 24, 2021
    Publication date: June 23, 2022
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Toru OKADA, Tomohiro OTSUKA
  • Patent number: 11346332
    Abstract: A piston ring includes a first ring portion which is fitted onto an outer circumferential portion of a piston and which is capable of sliding relative to an inner wall surface of a cylinder, and a second ring portion which is fitted onto the outer circumferential portion of the piston, arranged side-by-side with the first ring portion in the axial direction, and which is capable of sliding relative to the inner wall surface of the cylinder. The second ring portion is fitted onto the outer circumferential portion of the piston in such a way as to be positioned on a side opposite to a compression chamber inside the cylinder, relative to the first ring portion, and has a greater hardness than the first ring portion has.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: May 31, 2022
    Assignee: Kobe Steel, Ltd.
    Inventors: Naofumi Kanei, Tomohiro Otsuka, Hirotaka Ito, Hiroaki Nii
  • Publication number: 20220154709
    Abstract: A compressor includes: a cylinder main body; a valve block; a cylinder head; a first seal group composed of a plurality of seal parts; and a second seal group composed of a plurality of seal parts. The valve block includes a guide-out flow passage which opens between the seal parts composing the first seal group and opens between the seal parts composing the second seal group. The guide-out flow passage is linked to an outer pipe for conveying a leaked gas from a compression chamber to a predetermined place.
    Type: Application
    Filed: October 14, 2021
    Publication date: May 19, 2022
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Tomohiro OTSUKA, Naofumi KANEI
  • Publication number: 20220120264
    Abstract: A cylinder in a compression stage is provided with a first cooling channel through which a cooling fluid for absorbing heat generated between the cylinder and a first piston ring group flows, a second cooling channel through which a cooling fluid for absorbing heat generated between the cylinder and a second piston ring group flows, and a through hole penetrating a side wall of the cylinder in an intermediate part between the first cooling channel and the second cooling channel A hydrogen gas leaking from a compression chamber to the intermediate part through between the cylinder and a piston and then guided to a leak line. The leak line includes a piping part and a volume expansion unit in which volume in a predetermined distance range is larger than volume of the piping part at the same distance range as the predetermined distance range.
    Type: Application
    Filed: September 28, 2021
    Publication date: April 21, 2022
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Tomohiro OTSUKA, Naofumi KANEI
  • Publication number: 20220120263
    Abstract: A compression stage includes a cylinder, a piston, a first piston ring group, and a second piston ring group. The cylinder includes a first cooling channel through which a cooling fluid for absorbing heat generated between the cylinder and the first piston ring group flows, a second cooling channel through which a cooling fluid for absorbing heat generated between the cylinder and the second piston ring group flows, and an intermediate part disposed between the first cooling channel and the second cooling channel. A communication channel is connected to the intermediate part and a connection pipe, and guides a hydrogen gas leaking from a compression chamber through the first piston ring group to the intermediate part, to the outside of the cylinder.
    Type: Application
    Filed: September 28, 2021
    Publication date: April 21, 2022
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Tomohiro OTSUKA, Naofumi KANEI
  • Publication number: 20210265473
    Abstract: Gate fingers extending symmetrically from both sides of gate connecting portions, drain electrodes adjacent to both the gate fingers extending from both the sides of the gate connecting portions, and source electrodes respectively adjacent to the gate fingers extending from both the sides of the gate connecting portions are included. Gate air bridges connect the gate connecting portions and a gate routing line while straddling the source electrodes.
    Type: Application
    Filed: May 10, 2021
    Publication date: August 26, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yutaro YAMAGUCHI, Tomohiro OTSUKA, Masatake HANGAI, Shintaro SHINJO
  • Patent number: 11096889
    Abstract: The present invention is an aqueous solution which contains two types of methyl celluloses, polyethylene glycol, polyvinylpyrrolidone, and citric acid or a pharmaceutically acceptable salt thereof. The composition of the present invention maintains a low viscosity around room temperature, but the composition is suddenly increased in the viscosity due to heat around the body temperature and has thixotropy even after gelation.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: August 24, 2021
    Assignee: WAKAMOTO PHARMACEUTICAL CO., LTD.
    Inventors: Takeshi Yamamura, Ayaka Yamamuro, Emi Izukura, Moto Kimura, Tomohiro Otsuka
  • Publication number: 20210156371
    Abstract: A piston ring includes a first ring portion which is fitted onto an outer circumferential portion of a piston and which is capable of sliding relative to an inner wall surface of a cylinder, and a second ring portion which is fitted onto the outer circumferential portion of the piston, arranged side-by-side with the first ring portion in the axial direction, and which is capable of sliding relative to the inner wall surface of the cylinder. The second ring portion is fitted onto the outer circumferential portion of the piston in such a way as to be positioned on a side opposite to a compression chamber inside the cylinder, relative to the first ring portion, and has a greater hardness than the first ring portion has.
    Type: Application
    Filed: April 8, 2019
    Publication date: May 27, 2021
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Naofumi KANEI, Tomohiro OTSUKA, Hirotaka ITO, Hiroaki NII
  • Publication number: 20200408302
    Abstract: The present invention discloses a compressor configured to compress gas. The compressor includes: a cylinder part; a piston disposed in the cylinder part to form in the cylinder part a compression chamber in which the gas is compressed, the piston being configured to compress the gas in the compression chamber; a first sealing part located adjacent to the compression chamber and attached to an outer circumference of the piston, and formed mainly containing at least one type of component that is selected from a group of polyetheretherketone, polyimide, and polybenzimidazole; and a second sealing part located more separated from the compression chamber than the first sealing part is from the compression chamber and attached to the outer circumference of the piston, the second sealing part having a hardness equal to or smaller than that of the first sealing part.
    Type: Application
    Filed: April 30, 2020
    Publication date: December 31, 2020
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Naofumi KANEI, Tomohiro OTSUKA
  • Patent number: 10670094
    Abstract: A brake lining includes friction structures, back boards fastened to respective the friction structures, a base plate supporting the friction structures. Each of the friction structures includes two adjacent friction portions with a groove formed in the front surface in between, and a thin portion with a smaller thickness than thicknesses of the friction portions, the thin portion located in a position corresponding to the groove. Each of the friction structures is supported by the base plate on two support points located in the two friction portions respectively. The thin portion has a constant length, the length being equal to a maximum width of the friction portions and satisfying a condition that L/D is equal to or greater than 1.1, where D denotes the length of the thin portion and L denotes a distance between the two support points located in the friction portions.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: June 2, 2020
    Assignees: NIPPON STEEL CORPORATION, CENTRAL JAPAN RAILWAY COMPANY
    Inventors: Takahiro Fujimoto, Atsushi Sakaguchi, Naruo Miyabe, Tomohiro Otsuka, Seiji Kanamori, Jun Asano
  • Publication number: 20200121592
    Abstract: The present invention is an aqueous solution which contains two types of methyl celluloses, polyethylene glycol, polyvinylpyrrolidone, and citric acid or a pharmaceutically acceptable salt thereof. The composition of the present invention maintains a low viscosity around room temperature, but the composition is suddenly increased in the viscosity due to heat around the body temperature and has thixotropy even after gelation.
    Type: Application
    Filed: December 17, 2019
    Publication date: April 23, 2020
    Inventors: Takeshi YAMAMURA, Ayaka YAMAMURO, Emi IZUKURA, Moto KIMURA, Tomohiro OTSUKA
  • Publication number: 20200086897
    Abstract: A floating caliper brake device for a railroad vehicle 100 includes: a support frame 1 that has a cylindrical portion 1a; a support pin 2 that is supported by the cylindrical portion 1a in such a manner as to be slidable in a direction X; a caliper 3 that includes a first arm portion 3a and a second arm portion 3b; a first brake shoe 4; a second brake shoe 5 that is opposite to the first brake shoe 4; a pressurizing device 6 that moves the first brake shoe 4 back and forth; an elastic member 7 that is expandable and contractible in the direction X; a stopper member 8 that is immovable relatively to the cylindrical portion 1a in the direction X; and a moving member 9 that is frictionally engaged with the support pin 2 in such a manner as to be slidable in the direction X, wherein end portions on an L side of the elastic member 7 and the stopper member 8 are each supported by the cylindrical portion 1a, at least a portion of an end portion on an R side of the stopper member 8 overlaps the moving member 9 when v
    Type: Application
    Filed: May 22, 2018
    Publication date: March 19, 2020
    Applicants: NIPPON STEEL CORPORATION, CENTRAL JAPAN RAILWAY COMPANY
    Inventors: Kousuke SAKAGUCHI, Kazuaki FUJITA, Masanori SAWADA, Hironori YOKOTA, Tomohiro OTSUKA, Jun ASANO, Masashi SEKIYA, Seiji KANAMORI
  • Patent number: 10532026
    Abstract: The present invention is an aqueous solution which contains two types of methyl celluloses, polyethylene glycol, polyvinylpyrrolidone, and citric acid or a pharmaceutically acceptable salt thereof. The composition of the present invention maintains a low viscosity around room temperature, but the composition is suddenly increased in the viscosity due to heat around the body temperature and has thixotropy even after gelation.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: January 14, 2020
    Assignee: WAKAMOTO PHARMACEUTICAL CO., LTD.
    Inventors: Takeshi Yamamura, Ayaka Yamamuro, Emi Izukura, Moto Kimura, Tomohiro Otsuka
  • Publication number: 20180360746
    Abstract: The present invention is an aqueous solution which contains two types of methyl celluloses, polyethylene glycol, polyvinylpyrrolidone, and citric acid or a pharmaceutically acceptable salt thereof. The composition of the present invention maintains a low viscosity around room temperature, but the composition is suddenly increased in the viscosity due to heat around the body temperature and has thixotropy even after gelation.
    Type: Application
    Filed: August 23, 2018
    Publication date: December 20, 2018
    Inventors: Takeshi YAMAMURA, Ayaka YAMAMURO, Emi IZUKURA, Moto KIMURA, Tomohiro OTSUKA
  • Publication number: 20180259018
    Abstract: A brake lining includes friction structures, back boards fastened to respective the friction structures, a base plate supporting the friction structures. Each of the friction structures includes two adjacent friction portions with a groove formed in the front surface in between, and a thin portion with a smaller thickness than thicknesses of the friction portions, the thin portion located in a position corresponding to the groove. Each of the friction structures is supported by the base plate on two support points located in the two friction portions respectively. The thin portion has a constant length, the length being equal to a maximum width of the friction portions and satisfying a condition that L/D is equal to or greater than 1.1, where D denotes the length of the thin portion and L denotes a distance between the two support points located in the friction portions.
    Type: Application
    Filed: October 19, 2016
    Publication date: September 13, 2018
    Inventors: Takahiro FUJIMOTO, Atsushi SAKAGUCHI, Naruo MIYABE, Tomohiro OTSUKA, Seiji KANAMORI, Jun ASANO
  • Patent number: D793282
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: August 1, 2017
    Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, CENTRAL JAPAN RAILWAY COMPANY
    Inventors: Takahiro Fujimoto, Takanori Kato, Yuiko Sakayama, Atsushi Sakaguchi, Kazutaka Asabe, Naruo Miyabe, Tomohiro Otsuka, Seiji Kanamori, Jun Asano