Patents by Inventor Isamu Onuma

Isamu Onuma 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).

  • Transmission case
    Patent number: 5105686
    Abstract: A transmission case has a wall portion defining an oil pressure chamber of a fluid operated friction device, and an end portion having a threaded hole receiving a bolt for fastening a side cover to the case. In order to make the wall portion impervious to oil notwithstanding defects formed by casting, the wall portion is separated from the end portion by a U-shaped groove. Furthermore, the end portion is shaped into an outward flange through which the threaded hole passes from one side to the other.
    Type: Grant
    Filed: April 25, 1991
    Date of Patent: April 21, 1992
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Isamu Onuma, Kazuhiko Sugano