Patents by Inventor Robert Weissman

Robert Weissman 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: 5243423
    Abstract: A co-channel communication system allows transmission of one or more data signals in an active or visible portion of a video raster in a manner that is imperceptible to a viewer. More particularly, the data signal is transmitted over a preselected active video lines of a video raster. In order to reduce the perceptibility of the data signal, the video lines over which the data signal is transmitted is varied according to a random sequence. In an alternate embodiment, the data is also modulated at relatively low modulation levels, for example, by converting the data signal to a spread spectrum signal.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: September 7, 1993
    Assignee: A. C. Nielsen Company
    Inventors: Jean P. DeJean, Daozheng Lu, Robert Weissman