Patents by Inventor James F. Duca

James F. Duca 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: 4392156
    Abstract: Conventional border, drop shadow and/or matte outline generating signals are selectively gated through an offset amplifier of less than unity gain and then fed back into the existing delay lines, to selectively modify the horizontal and vertical trailing edge of the waveform generated by the loop, which, in turn, modifies accordingly the selectively switched composite video signal, i.e., provides for selectively increasing the size and/or varying the configuration of the luminance key signals.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: July 5, 1983
    Assignee: Ampex Corporation
    Inventors: James F. Duca, Jerry A. Moline