Patents by Inventor Shouichi Tsuruga

Shouichi Tsuruga 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).

  • Method and apparatus for manufacturing disk products having helical ridges
    Patent number: 5953950
    Abstract: A method and an apparatus for producing a disc product having a plane carng a relief and helical ridges on the outer peripheral side. The inventive production method and the apparatus therefor have enabled a continuous processing of a material mass to forge into, produce and push out a disc product while retaining the quality of the relief plane, and thereby facilitating production of the disc product by die forging.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: September 21, 1999
    Assignee: Japan, represented by Director-General, Mint Bureau, Ministry of Finance
    Inventors: Shinkichi Sasaoka, Yoshinori Yama, Fujio Sakatani, Shouichi Tsuruga