Patents by Inventor David N. Balch

David N. Balch 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).

  • Simulative clock
    Patent number: D339297
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: September 14, 1993
    Inventor: David N. Balch