Patents by Inventor Frank R. Button

Frank R. Button 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).

  • Knife sharpener
    Patent number: D326989
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: June 16, 1992
    Assignee: The Tri-V Corporation
    Inventors: Frank R. Button, Alvin E. Taylor
  • Knife sharpener
    Patent number: D327402
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: June 30, 1992
    Assignee: The TRI-V Corporation
    Inventors: Frank R. Button, Alvin E. Taylor
  • Knife sharpener
    Patent number: D328847
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: August 25, 1992
    Assignee: Tri-V Corporation
    Inventors: Frank R. Button, Alvin E. Taylor