Patents by Inventor Hitoshi Hayakawa

Hitoshi Hayakawa 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).

  • Wear-resistant titanium or titanium-alloy member and a method for manufacturing the same
    Patent number: 4902359
    Abstract: A wear-resistant titanium or titanium-alloy member adapted for use as a poppet valve, rocker arm, etc., of an internal combustion engine, which requires lightness in weight and good wear resistance, and a method for manufacturing the member. The surface of the titanium or titanium-alloy member is given a Vickers hardness number of 390 to 1,200, preferably 400 to 800, and a hardened layer depth of 0.1 to 2.0 mm, preferably 0.3 to 1.5 mm, by being melt-hardened while being supplied with hardening elements.
    Type: Grant
    Filed: September 6, 1988
    Date of Patent: February 20, 1990
    Assignees: Daido Tokushuko Kabushiki Kaisha, Fuji Valve Co., Ltd.
    Inventors: Yukoh Takeuchi, Yoshihisa Kato, Hitoshi Hayakawa, Masaru Nagata, Shinji Nakayama