Patents by Inventor Philip D. Stone

Philip D. Stone 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).

  • Speaker
    Patent number: D329646
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: September 22, 1992
    Inventor: Philip D. Stone