Patents by Inventor Robert D. Gramprie

Robert D. Gramprie 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).

  • Canoe
    Patent number: D257029
    Type: Grant
    Filed: March 3, 1978
    Date of Patent: September 23, 1980
    Assignee: Sawyer Canoe Company
    Inventor: Robert D. Gramprie
  • Utility shelter
    Patent number: D270472
    Type: Grant
    Filed: September 17, 1981
    Date of Patent: September 6, 1983
    Inventor: Robert D. Gramprie