Patents by Inventor Tokio Hotta

Tokio Hotta 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).

  • Current-carrying member for a direct-current motor in a fuel pump, method for producing the same, and fuel pump
    Patent number: 6674212
    Abstract: A sulfidation-resistant current-carrying member, such as a commutator, suitable for a direct-current motor in a fuel pump is provided. The current-carrying member for a direct-current motor in a fuel pump includes a commutator composed of a carbon layer having carbon as a principal component and forming a sliding surface at one end, and a metal carbon layer fixedly bound with the carbon layer at the other end and comprising 55 to 90 wt % of metal having brass as a principal component and a remaining portion having carbon as a principal component. By using brass as a primary metal component in the metal carbon layer, it is possible to achieve a commutator with superior resistance to sulfidation.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: January 6, 2004
    Assignees: Denso Corporation, TRIS Inc.
    Inventors: Kyoji Inukai, Youichi Murakami, Etsuo Kokuryu, Kenzo Kiyose, Keizo Takeuchi, Tokio Hotta, Yoichi Sakaura, Kenichi Matsumoto, Sinya Nakagawa, Makoto Nisio
  • Current-carrying member for a direct-current motor in a fuel pump, method for producing the same, and fuel pump
    Publication number: 20020180300
    Abstract: A sulfidation-resistant current-carrying member, such as a commutator, suitable for a direct-current motor in a fuel pump is provided. The current-carrying member for a direct-current motor in a fuel pump includes a commutator composed of a carbon layer having carbon as a principal component and forming a sliding surface at one end, and a metal carbon layer fixedly bound with the carbon layer at the other end and comprising 55 to 90 wt % of metal having brass as a principal component and a remaining portion having carbon as a principal component. By using brass as a primary metal component in the metal carbon layer, it is possible to achieve a commutator with superior resistance to sulfidation.
    Type: Application
    Filed: June 5, 2002
    Publication date: December 5, 2002
    Inventors: Kyoji Inukai, Youichi Murakami, Etsuo Kokuryu, Kenzo Kiyose, Keizo Takeuchi, Tokio Hotta, Yoichi Sakaura, Kenichi Matsumoto, Shinya Nakagawa, Makoto Nisio
  • Carbon commutator
    Patent number: 6259183
    Abstract: Disclosed is a carbon commutator, comprising a plurality of metal segments each having a through-hole, a plurality of carbon segments each having a projecting portion, which contains a metal, being inserted into the through-hole to be deformed so as to join the carbon segment to the metal segment, and a commutator body on which a plurality of the metal/carbon joined segments are arranged fixedly in a manner to form a substantially circular body.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: July 10, 2001
    Assignee: TRIS Inc.
    Inventors: Tokio Hotta, Noboru Yoshikawa, Yoichi Sakaura