Patents by Inventor Robert M. Hartt

Robert M. Hartt 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).

  • Foldable back rest for a canoe seat
    Patent number: D290797
    Type: Grant
    Filed: February 11, 1985
    Date of Patent: July 14, 1987
    Inventor: Robert M. Hartt
  • Manual skeet thrower
    Patent number: D291463
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: August 18, 1987
    Inventor: Robert M. Hartt
  • Canoe paddle
    Patent number: D302147
    Type: Grant
    Filed: March 12, 1987
    Date of Patent: July 11, 1989
    Inventor: Robert M. Hartt