Patents by Inventor Pieter J. Zijlstra

Pieter J. Zijlstra 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).

  • Television picture display device
    Patent number: 4750038
    Abstract: In a television picture display device which can display a compressed (by 13) sub-picture of a second video signal source (29) in a main picture of a first video signal source (1), a correct mutual location of the picture information in the sub-picture with respect to the main picture is always obtained by means of a first (55) and a second (119) even-odd field identification circuit for the sub-picture and for the main picture, respectively, an interlacing circuit (71) and an interlacing-correction circuit (125), so that troublesome phenomena no longer occur in the sub-picture upon field transitions.
    Type: Grant
    Filed: May 27, 1987
    Date of Patent: June 7, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Petrus W. G. Welles, Dionysius A. Boerrigter, Hendrik Van Der Wal, Pieter J. Zijlstra