Patents by Inventor Hirotaka TOHYAMA

Hirotaka TOHYAMA 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).

  • Ball bearing
    Patent number: 11898604
    Abstract: A ball bearing includes an inner ring; an outer ring placed outside of the inner ring; a plurality of rolling bodies intervening between the inner ring and the outer ring; and an annular cage including pockets rotatably holding the rolling bodies in a circumferential direction at intervals determining a rotation axis to be a center. The cage comprises a resin composition comprising a polyetherketone-based resin, graphite, and a carbon fiber. The resin composition comprises the polyetherketone-based resin in an amount of 60% by weight or more and 80% by weight or less, the graphite in an amount of 10% by weight or more and 30% by weight or less, and the carbon fiber in an amount of 5% by weight or more and 20% by weight or less when the entire resin composition is determined to be 100% by weight.
    Type: Grant
    Filed: July 23, 2021
    Date of Patent: February 13, 2024
    Assignee: MINEBEA MITSUMI Inc.
    Inventors: Tadahiko Karaki, Hirotaka Tohyama, Kunihiro Matsumoto
  • BALL BEARING
    Publication number: 20210348649
    Abstract: A ball bearing includes an inner ring; an outer ring placed outside of the inner ring; a plurality of rolling bodies intervening between the inner ring and the outer ring; and an annular cage including pockets rotatably holding the rolling bodies in a circumferential direction at intervals determining a rotation axis to be a center. The cage comprises a resin composition comprising a polyetherketone-based resin, graphite, and a carbon fiber. The resin composition comprises the polyetherketone-based resin in an amount of 60% by weight or more and 80% by weight or less, the graphite in an amount of 10% by weight or more and 30% by weight or less, and the carbon fiber in an amount of 5% by weight or more and 20% by weight or less when the entire resin composition is determined to be 100% by weight.
    Type: Application
    Filed: July 23, 2021
    Publication date: November 11, 2021
    Inventors: Tadahiko KARAKI, Hirotaka TOHYAMA, Kunihiro MATSUMOTO
  • Photocurable resin composition and sliding member
    Patent number: 10746225
    Abstract: A photocurable resin composition for a self-lubricating liner contains a (meth)acrylate compound having an isocyanuric acid ring, a polytetrafluoroethylene resin and at least one of zirconium phosphate tungstate and zirconium phosphate.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: August 18, 2020
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Tadahiko Karaki, Hirotaka Tohyama
  • PHOTOCURABLE RESIN COMPOSITION AND SLIDING MEMBER
    Publication number: 20190301530
    Abstract: A photocurable resin composition for a self-lubricating liner contains a (meth)acrylate compound having an isocyanuric acid ring, a polytetrafluoroethylene resin and at least one of zirconium phosphate tungstate and zirconium phosphate.
    Type: Application
    Filed: March 27, 2019
    Publication date: October 3, 2019
    Inventors: Tadahiko KARAKI, Hirotaka TOHYAMA
  • Ultraviolet curable resin composition and sliding member
    Patent number: 10167439
    Abstract: There is provided an ultraviolet curable resin composition for a self-lubricating liner, including: a (meth)acrylate compound having an isocyanuric acid ring; at least one of (meth)acrylate having a phosphoric acid ester group and (meth)acrylate having a silane group: a polythiol compound; and a polytetrafluoroethylene resin as a solid lubricant.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: January 1, 2019
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Hirotaka Tohyama, Tadahiko Karaki, Yuko Taguchi, Kentaro Ishikawa
  • ULTRAVIOLET CURABLE RESIN COMPOSITION AND SLIDING MEMBER
    Publication number: 20170349851
    Abstract: There is provided an ultraviolet curable resin composition for a self-lubricating liner, including: a (meth)acrylate compound having an isocyanuric acid ring; at least one of (meth)acrylate having a phosphoric acid ester group and (meth)acrylate having a silane group: a polythiol compound; and a polytetrafluoroethylene resin as a solid lubricant.
    Type: Application
    Filed: May 31, 2017
    Publication date: December 7, 2017
    Applicant: MINEBEA MITSUMI INC.
    Inventors: Hirotaka TOHYAMA, Tadahiko KARAKI, Yuko TAGUCHI, Kentaro ISHIKAWA