Patents by Inventor Seiji Kanuki

Seiji Kanuki 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).

  • Steering rack shaft and method of manufacturing the same
    Patent number: 5473960
    Abstract: A steering rack shaft having a shaft body and rack teeth formed in a predetermined axial region of the shaft body. This steering rack shaft is formed such that a workpiece is quenched, and is then heated for a predetermined time at a temperature exceeding 400.degree. C. so as to be thermally refined, and the rack teeth are subsequently formed. After the formation of the rack teeth, high-frequency induction hardening is provided to form a teeth-hardened layer. Hence, the machining of the rack teeth is facilitated while reducing strain, and the rigidity and toughness of the overall steering rack shaft are improved.
    Type: Grant
    Filed: March 10, 1994
    Date of Patent: December 12, 1995
    Assignee: Kabushiki Kaisha Yamada Seisakusho
    Inventors: Hideji Sakamoto, Masayoshi Ozawa, Seiji Kanuki, Kenji Hoshino, Toshiaki Tanaka