Patents by Inventor Takaharu Yamamoto

Takaharu Yamamoto 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).

  • Cemented carbonitride alloys
    Patent number: 4049876
    Abstract: This invention relates to a cemented carbonitride alloy in which the hard phase consists of[(Group IVa metal).sub.A (Group Va metal).sub.B (Group VIa metal).sub.C ]-(C.sub.X N.sub.Y).sub.Zwherein A, B, C, X and Y are respectively mole fractions, Z is a mole ratio of the metalloid components to the metal components and there are among A, B, C, X, Y and Z the relations ofA + B + C = 1, X + Y = 1,4a + 5b + 6c + 4xz + 5yz .gtoreq. 8.6,0.05 .ltoreq. y .ltoreq. 0.50 and 0.85 .ltoreq. Z .ltoreq. 1.0.the hard phase is combined by at least one binder metal from the iron group and there are in the alloy structure WC phase and the hard phase having the crystal structure B1 and containing Ti in a proportion of at least 20 atomic percent to the metallic atoms.
    Type: Grant
    Filed: November 18, 1976
    Date of Patent: September 20, 1977
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takaharu Yamamoto, Toshio Nomura, Tsuyoshi Asai, Akio Hara