Patents by Inventor Dennis J. Graham

Dennis J. Graham 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).

  • Teaching clock
    Patent number: D306611
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: March 13, 1990
    Assignee: Educational Insights, Inc.
    Inventors: Brian Hills, Dennis J. Graham, Burton Cutler
  • Talking globe base
    Patent number: D376818
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: December 24, 1996
    Assignee: Educational Insights, Inc.
    Inventors: Dennis J. Graham, Gregory B. Bergeron, Damon R. Saddler