Patents by Inventor Masazumu Onishi

Masazumu Onishi 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).

  • Brightening chemical polishing solution for hardened steel article
    Patent number: 5256316
    Abstract: A brightening chemical polishing solution for a hardened steel article (e.g., a carburized and quenched gear) comprises hydrofluoric acid having a molar concentration of from 0.2 to 2 mol/l, hydrogen peroxide having a molar concentration of from 0.4 to 4 mol/l, and water, a molar ratio of the hydrofluoric acid to the hydrogen peroxide being from 1:1.5 to 1:2.8. The steel article is quench hardened and is chemically polished in the solution. A shot-peening is additionally performed, prior to the polishing.
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: October 26, 1993
    Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho, Toyota Jidosha Kabushiki Kaisha
    Inventors: Kenichi Suzuki, Masaki Kajino, Kazuyoshi Ogawa, Takashi Asano, Mineo Ogino, Hideo Aihara, Fumio Shimizu, Masazumu Onishi, Yasuyuki Suzuki