Patents by Inventor Sebastianus J. Op Het Veld

Sebastianus J. Op Het Veld 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).

  • Patent number: 4338623
    Abstract: To prevent display screen burn-in of a picture having, for example, bright lines or other picture components remaining stationary for a long period of time, a video circuit is examined to detect how long the information has not been changed. If a predetermined time limit is exceeded, the picture brightness is limited to a sufficiently low average value or, if so desired, to zero brightness, by means of one or more protection switches.
    Type: Grant
    Filed: April 30, 1980
    Date of Patent: July 6, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Jean-Pierre Asmus, Joseph Soto, Sebastianus J. Op Het Veld, Henri W. Schneider
  • Patent number: 4295158
    Abstract: A simple and reliable digital frequency divider for non-integer rational divisors using a signal polarity switch commanded by an auxiliary counter which derives its counting pulses from a main N-position counter. For such complex divisors the generation of phase leads by toggling the signal polarity switch can be delayed or some phase leads can be suppressed by using relatively low-frequency delay pulses, to avoid large auxiliary counters. Video timing circuits are described based on digital frequency dividers of such types.
    Type: Grant
    Filed: September 14, 1979
    Date of Patent: October 13, 1981
    Assignee: U.S. Philips Corporation
    Inventors: Nico Nissen, Sebastianus J. Op Het Veld, Henri W. Schneider