Patents by Inventor Toshihiro Miyakawa

Toshihiro Miyakawa 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).

  • High carbon chromium bearing steel
    Patent number: 4911885
    Abstract: a high carbon chromium bearing steel having a carbon content from 0.8% to 1.2% by weight, and which is characterized by a nickel content of 1.0% to 2.0% by weight, a chromium content of 0.9% to 2.0% by weight, a silicon content of 1.0% to 2.0% by weight, and a sulfur combined and phosphorus content of 0.015% to 0.040% by weight.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: March 27, 1990
    Assignees: Koyo Seiko Co., Ltd., Nippon Koshuha Steel Co., Ltd.
    Inventors: Yoshiaki Hyodo, Masamichi Shibata, Toshihiro Miyakawa