Patents Represented by Law Firm Lorussu & Loud
  • Method for making silicon nitride powder
    Patent number: 4986972
    Abstract: A mixture of silica powder and carbon powder is heated in a mixture of NH.sub.3 gas and C.sub.m H.sub.n gas. Only silica powder may be heated in a mixture of NH.sub.3 gas and C.sub.m H.sub.n gas.
    Type: Grant
    Filed: March 17, 1988
    Date of Patent: January 22, 1991
    Assignee: Toshiba Ceramics Co., Ltd.
    Inventors: Toshitsuga Ishii, Isao Imai, Akira Sano, Kouichi Sueyoshi