Patents by Inventor Toru Kuramoto

Toru Kuramoto 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).

  • Metal diboride base sintered ceramic and method of producing same
    Patent number: 5019540
    Abstract: The invention provides a sintered ceramic of which the principal component is TiB.sub.2 and/or ZrB.sub.2. The sintered ceramic contains a vanadium compound such as VC, VB or VN and/or a molybdenum compound such as MoC, MoSi.sub.2 or MoB such that the content of V and/or Mo is 0.5-99.5 wt % of the principal component. Furthermore, the sintered ceramic contains at least one nitride such as TiN, ZrN, TaN or CrN amounting to 1-50 wt % of the principal component and carbon amounting to 0.5-10 wt % of the principal component. The sintered ceramic is high in hardness and mechanical strength and, by virtue of including a nitride in the additives, is particularly enhanced in fracture toughness. The sintered ceramic is produced by mixing a principal material, TiB.sub.2 and/or ZrB.sub.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: May 28, 1991
    Assignee: Central Glass Company, Limited
    Inventors: Toru Kuramoto, Hitoshi Tukuda, Hiroshi Ono