Patents by Inventor Sadayoshi Yamazaki

Sadayoshi Yamazaki 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).

  • Pipe joint
    Patent number: 4133563
    Abstract: A pipe joint having a socket provided with an annular groove for receiving a rubber ring seal, the internal surface of the socket having two conic parts axially diverging from the circumferential edges of the annular groove to the opposite directions along two conic surfaces with an identical vertical angle, respectively.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: January 9, 1979
    Inventor: Sadayoshi Yamazaki