Patents by Inventor Warren Pratt

Warren Pratt 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).

  • Raster scan color display system and method having improved pin cushion non-linearity correction
    Patent number: 4335333
    Abstract: A raster scan color display system for a CRT includes a vertical sweep system wherein a parabolic signal repeating at the horizontal sweep rate is multiplied with a vertical sweep signal corresponding to a linear ramp repeating at a vertical deflection rate. The output is differentiated and capacitively coupled to a wideband voltage drive vertical deflection amplifier to provide pin-cushion non-linearity correction.
    Type: Grant
    Filed: January 29, 1980
    Date of Patent: June 15, 1982
    Assignee: Hewlett-Packard Company
    Inventors: Michael Ramsay, Warren Pratt