Patents by Inventor Tadaoki Arakawa

Tadaoki Arakawa 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).

  • Heat-resistant, corrosion-resistant nickel base alloys
    Patent number: 4793970
    Abstract: The present disclosure relates to heat-resistant, corrosion-resistant alloys to be used as materials for the exhaust valve of an internal combustion engine which contain specified amounts of C, Cr, Co, Fe, Ti, Al, Nb, and Ta.
    Type: Grant
    Filed: May 17, 1979
    Date of Patent: December 27, 1988
    Inventors: Itaru Niimi, Kametaro Hashimoto, Masamitsu Noguchi, Tadaoki Arakawa, Taizo Suzuki, Kunio Imada
  • Poppet valve
    Patent number: 4073474
    Abstract: An upset-forged poppet valve wherein at least the head portion and a part of the neck is made of a high temperature super alloy while the remaining portion is made of a conventional valve steel, said two materials being connected by friction welding before said valve is forged. The method comprises two steps of first friction-welding two rods of said two materials and then forming the connected single rod into the poppet valve by upset-forging.
    Type: Grant
    Filed: December 30, 1975
    Date of Patent: February 14, 1978
    Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
    Inventors: Kametaro Hashimoto, Kenji Ushitani, Yoichi Serino, Tadaoki Arakawa