Patents by Inventor Toshitsuga Ishii

Toshitsuga Ishii 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).

  • 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