Patents by Inventor Jack Brian

Jack Brian 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 scrambling system
    Patent number: 4034402
    Abstract: A system for scrambling and descrambling the video portion of a television signal. At the transmitting end, the video is scrambled by shifting the phase angle of the carrier relative to that of the sidebands a constant amount. At each receiving site, the signal is unscrambled by locally deriving from the phase shifted carrier a carrier of the proper frequency, phase angle and amplitude. The locally generated carrier is then vector summed with the incoming phase shifted carrier to produce a carrier having proper phase angle.
    Type: Grant
    Filed: July 1, 1974
    Date of Patent: July 5, 1977
    Assignee: Hughes Aircraft Company
    Inventor: Jack Brian