Patents by Inventor Craig R. Ployd

Craig R. Ployd 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).

  • Video cassette security apparatus
    Patent number: 5261259
    Abstract: A locking device for use with a video cassette tape to prevent unauthorized usage in view of its content. The device incorporates a member that is expandable into certain recesses of the cassette when placed into a locking mode and, is not expanded when the cassette is in a non-locking mode. A specialized key is utilized with the device to prevent its duplication.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: November 16, 1993
    Inventor: Craig R. Ployd