Patents by Inventor Donald Grattan

Donald Grattan 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).

  • Variable force projector and catcher
    Patent number: 5253873
    Abstract: A spring-operated plunger type ball shooter is disclosed having a ball catcher and holder at one end and a twist grip trigger at the other end. The shooter is designed for the playing of games and includes a gravity actuated elevation indicator and a spring force indicator to increase the fun and accuracy of shooting. The shooter is provided with a trigger assembly along the barrel and a safety catch to hold the plunger rod in its cocked position.
    Type: Grant
    Filed: July 8, 1992
    Date of Patent: October 19, 1993
    Inventor: Donald Grattan