Patents by Inventor Hendrikus Looren de Jong

Hendrikus Looren de Jong 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).

  • Playback apparatus for correcting locking errors
    Patent number: 4297731
    Abstract: In a helical scan recorder using multiple heads having gaps positioned at different aximuth angles tracking errors are detected by signal processing the normal synchronization pulses recorded with the television signal. The signal processing is accomplished by using a phase shift detection circuit and a difference circuit for subtracting signals from the phase shift circuit indicating the instantaneous phase shifts produced by the tracking errors.
    Type: Grant
    Filed: February 26, 1979
    Date of Patent: October 27, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Harald Melwisch, Hendrikus Looren de Jong