Patents by Inventor Keizo Muramatsu

Keizo Muramatsu 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).

  • Wrist watch
    Patent number: D256561
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: August 26, 1980
    Inventor: Keizo Muramatsu
  • Wrist watch
    Patent number: D256677
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: September 2, 1980
    Inventor: Keizo Muramatsu
  • Wrist watch
    Patent number: D258120
    Type: Grant
    Filed: December 8, 1978
    Date of Patent: February 3, 1981
    Inventor: Keizo Muramatsu