Patents by Inventor Sukehisa Niwa

Sukehisa Niwa 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).

  • Steel for gears, having high strength, toughness and machinability
    Patent number: 4946645
    Abstract: A steel composition for gears, consisting of: 0.10-0.30% by weight of C; less than 0.15% by weight of Si; no more than 1.5% by weight of Mn; no more than 0.015% by weight of P; no more than 0.005% by weight of S; 0.50-1.50% by weight of Cr; 0.005-0.06% by weight of Pb; and the balance being Fe and inevitably included impurities.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: August 7, 1990
    Assignees: Daido Tokushuko Kabushiki Kaisha, Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kunio Namiki, Atsuyoshi Kumura, Sukehisa Niwa, Toshihiko Matsubara