Patents by Inventor Mika Niwa

Mika Niwa 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).

  • Diamond-coated sintered body excellent in adhesion and process for preparing the same
    Patent number: 5204167
    Abstract: There are disclosed a diamond-coated sintered body, comprising a film of diamond and/or diamond-like carbon deposited on the surface of a sintered body of a hard phase composed mainly of a mixture of W.sub.2 C and WC and inevitable impurities and a process for preparing the same.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: April 20, 1993
    Assignee: Toshiba Tungaloy Co., Ltd.
    Inventors: Kosuke Saijo, Masaru Yagi, Kunio Shibuki, Takeshi Sadahiro, Mika Niwa
  • Diamond-coated sintered body excellent in adhesion and process for preparing the same
    Patent number: 5100703
    Abstract: There are disclosed a diamond-coated sintered body, comprising a film or diamond and/or diamond-like carbon deposited on the surface of a sintered body of a hard phase composed mainly of a mixture of W.sub.2 C and WC and inevitable impurities and a process for preparing the same.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: March 31, 1992
    Assignee: Toshiba Tungaloy Co., Ltd.
    Inventors: Kosuke Saijo, Masaru Yagi, Kunio Shibuki, Takeshi Sadahiro, Mika Niwa