Patents by Inventor Douglas E. Ritchie

Douglas E. Ritchie 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).

  • Timepiece face
    Patent number: D322415
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: December 17, 1991
    Assignee: By Design Corp.
    Inventor: Douglas E. Ritchie