Patents by Inventor Douglas R. Woll

Douglas R. Woll 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).

  • Toothbrush
    Patent number: D321092
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: October 29, 1991
    Inventors: Margo Y. Woll, Douglas R. Woll
  • Toothbrush
    Patent number: D321287
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: November 5, 1991
    Inventors: Douglas R. Woll, Margo Y. Woll