Patents by Inventor Tadamasa Yanai

Tadamasa Yanai 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).

  • Mechanical seal and method of forming a sliding surface thereof
    Patent number: 4444399
    Abstract: A mechanical seal has a predetermined number of fine grooves formed on a sliding surface thereof, both ends of the fine grooves respectively reaching the outer peripheral end and the inner peripheral end of the sliding surface, part of the fine grooves being inclined forwardly and the remainder inclined rearwardly with respect to the relative rotational direction of the sliding surface. With those fine grooves it is intended to improve the sealing effect and the lubricating effect of the sliding surface. Also provided is a method of forming such a sliding surface.
    Type: Grant
    Filed: September 2, 1982
    Date of Patent: April 24, 1984
    Assignee: Eagle Industry Co., Ltd.
    Inventors: Tadamasa Yanai, Risaburo Sagehashi, Yoshio Kameyama, Takao Shimomura
  • Mechanical seal and method of forming a sliding surface thereof
    Patent number: 4420162
    Abstract: A mechanical seal has a predetermined number of fine grooves formed on a sliding surface thereof, both ends of the fine grooves respectively reaching the outer peripheral end and the inner peripheral end of the sliding surface, part of the fine grooves being inclined forwardly and the remainder inclined rearwardly with respect to the relative rotational direction of the sliding surface. With those fine grooves it is intended to improve the sealing effect and the lubricating effect of the sliding surface. Also provided is a method of forming such a sliding surface.
    Type: Grant
    Filed: November 3, 1981
    Date of Patent: December 13, 1983
    Assignee: Eagle Industry Co., Ltd.
    Inventors: Tadamasa Yanai, Risaburo Sagehashi, Yoshio Kameyama, Takao Shimomura