Patents by Inventor Robert A. Bills

Robert A. Bills 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).

  • Access prevention device for padlock
    Patent number: D408265
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: April 20, 1999
    Inventor: Robert A. Bills
  • Trailer hitch lock
    Patent number: D419121
    Type: Grant
    Filed: April 5, 1999
    Date of Patent: January 18, 2000
    Inventor: Robert A. Bills
  • Closed-end trailer hitch lock
    Patent number: D420632
    Type: Grant
    Filed: April 5, 1999
    Date of Patent: February 15, 2000
    Inventor: Robert A. Bills