Patents Assigned to Japan, represented by Director-General, Mint Bureau, Ministry of Finance
  • 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