Patents by Inventor Jean P. DeJean

Jean P. DeJean 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: 5278988
    Abstract: A method and apparatus are provided for determining a particular transmitting station from which program signals are received and translated by a monitored receiver within a test area and including mobile receivers. A stored transmitter characteristic table includes a corresponding transmitting station identification stored with a predefined subarea of a plurality of predefined subareas within the test area for each predetermined tuned frequency of the monitored receiver. A tuned frequency of the monitored receiver is identified and the particular transmitting station corresponding to the identified tuned frequency is identified responsive to both the identified tuned frequency of the monitored receiver and the stored transmitter characteristic table. The identified transmitting station data is stored with time of occurrence data.
    Type: Grant
    Filed: June 14, 1991
    Date of Patent: January 11, 1994
    Assignee: A. C. Nielsen Company
    Inventors: Jean P. Dejean, Enrico Massetti, Ken Straub, Everett Zurlinden
  • 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