Patents by Inventor Minoru Hirono

Minoru Hirono 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).

  • Nitrogen containing high speed steel obtained by powder metallurgical process
    Patent number: 4121930
    Abstract: The present invention relates to a nitrogen containing high speed steel obtained by the powder metallurgical process, which comprises at least 0.40% N, 1.6 to 15% V, C in an amount satisfying the relationship of 0.5 + 0.2V (%) .ltoreq. (C + N) .ltoreq. 0.8 + 0.2V (%), at least one element selected from the group consisting of up to 15% of Cr, up to 10% of Mo, up to 20% of W and up to 15% of Co with the balance iron.
    Type: Grant
    Filed: December 29, 1976
    Date of Patent: October 24, 1978
    Assignee: Kobe Steel, Ltd.
    Inventors: Toru Yukawa, Nobuyasu Kawai, Katuhiko Honma, Hirofumi Fujimoto, Hiroshi Takigawa, Minoru Hirono, Masaru Ishii, Tsuneo Tatsuno