Patents by Inventor Junichi Sagawa

Junichi Sagawa 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).

  • Piston ring having a wear resistant surface layer
    Patent number: 4876158
    Abstract: There is disclosed a wear resistant surface layer composed of 40 to 70 wt. % cobalt or cobalt base alloy as binder and the balance is substantially chromium oxide particles.
    Type: Grant
    Filed: March 18, 1988
    Date of Patent: October 24, 1989
    Assignees: Kabushikikaisha Riken, Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Toru Onuki, Junichi Sagawa, Tamotsu Watanabe, Toshio Yoshimitsu