Patents by Inventor E. Thomas Freeman

E. Thomas Freeman 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).

  • Film advance indicator
    Patent number: 4311378
    Abstract: A film advancement indicator which includes an optical sensor 21 that detects the rotational movement of a disc 18 that rotates only when the film 14 advances. When the film 14 does not advance, an indicator light 29 is activated. A counter 26 is included in the electronic circuit to determine the number of film frames advanced.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: January 19, 1982
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: E. Thomas Freeman, Charles W. Stump, Francis W. Dreisbach