Patents by Inventor Zenji Shimura

Zenji Shimura 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).

  • Gasket composition comprising fibrillated PTFE
    Patent number: 4990544
    Abstract: Use of a composition comprising a polytetrafluoroethylene resin and a fine inorganic powder for a gasket, said composition being characterized in that the polytetrafluoroethylene resin is at least 5% by weight and the fine inorganic powder is at least 40% by weight, based on the total amount of the polytetrafluoroethylene resin and the fine inorganic powder; the total amount of the polytetrafluoroethylene resin and the fine inorganic powder is at least 80% by weight based on the entire amount of the composition; and the polytetrafluoroethylene resin and the fine inorganic powder are mutually uniformly dispersed and mixed with each other.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: February 5, 1991
    Assignee: Nichias Corporation
    Inventors: Hiroshi Asaumi, Zenji Shimura, Takehiro Yoshida, Kenji Tadakuma, Shinzaburo Suzuki, Norio Takada, Kenichi Nakamura, Takene Hirai
  • Gasket containing (I) a sheet composition comprising (A) PTFE (B) inorganic powder (C) clay mineral and (II) a metal support for the sheet
    Patent number: 4839221
    Abstract: Use of a composition comprising a polytetrafluoroethylene resin and a fine inorganic powder for a gasket, said composition being characterized in that the polytetrafluoroethylene resin is at least 5% by weight and the fine inorganic powder is at least 40% by weight, based on the total amount of the polytetrafluoroethylene resin and the fine inorganic powder; the total amount of the polytetrafluoroethylene resin and the fine inorganic powder is at least 80% by weight based on the entire amount of the composition; and the polytetrafluoroethylene resin and the fine inorganic powder are mutually uniformly dispersed and mixed with each other.
    Type: Grant
    Filed: October 9, 1987
    Date of Patent: June 13, 1989
    Assignee: Nichias Corporation
    Inventors: Hiroshi Asaumi, Zenji Shimura, Takehiro Yoshida, Kenji Tadakuma, Shinzaburo Suzuki, Norio Takada, Kenichi Nakamura, Takene Hirai