Patents by Inventor Gary A. Pratt

Gary A. Pratt 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).

  • Device for detecting and rejecting invalid coins utilizing a verticle coin chute and multiple coin tests
    Patent number: 4483431
    Abstract: A coin testing device having a substantially vertical coin chute with facility for testing coin size, central opening, topography and metal content while the coin is substantially traveling in free fall. Testing elements are located on the same side of the coin chute. The Hall effect is utilized to detect magnetic content.
    Type: Grant
    Filed: October 13, 1981
    Date of Patent: November 20, 1984
    Assignee: Harrah's, Inc.
    Inventor: Gary A. Pratt