Patents by Inventor Robert Riddle

Robert Riddle 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).

  • Paint composition
    Patent number: 5039745
    Abstract: The present invention relates to a paint composition which contains a silicone resin, a polytetrafluoroethylene polymer, and a polyurethane polymer in combination. The paint composition is useful as a surface coating that can be repeatedly cleaned with strong solvents and which possesses a non-stick surface.
    Type: Grant
    Filed: September 20, 1989
    Date of Patent: August 13, 1991
    Assignee: Creative Urethane Concepts, Inc.
    Inventor: Robert Riddle
  • Tamperproof pay telephone
    Patent number: 5018185
    Abstract: A tamperproof pay telephone is disclosed.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: May 21, 1991
    Inventor: Robert Riddle