Patents by Inventor Shiu H. Cheung

Shiu H. Cheung 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 audience measuring system
    Patent number: 4258386
    Abstract: Apparatus for television audience analysis comprising means for monitoring a television receiver, means responsive to a monitored signal for storing information representative of channel identification and of the time at which a channel is selected and at which the selection of a channel is terminated, and means for reading the stored information periodically.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: March 24, 1981
    Inventor: Shiu H. Cheung
  • Pay TV system
    Patent number: 4245246
    Abstract: An apparatus for coding video information arranged in a plurality of lines comprises means for selectively inverting video information in groups of lines. A random timing device controls the number of lines in successive groups. The video signals in one group are inverted and the video signals in the succeeding group are non-inverted.
    Type: Grant
    Filed: August 3, 1978
    Date of Patent: January 13, 1981
    Inventor: Shiu H. Cheung