Patents by Inventor Percy Keith Watson

Percy Keith Watson 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).

  • Photoelectrophoretic imaging method producing a desired image border
    Patent number: 3961949
    Abstract: In a photoelectrophoretic imaging system, a field established between first and second electrodes is modified in a manner for substantially reducing the field between these electrodes in an area in conformity with a desired border for an image being reproduced. In a particular arrangement, electrodes are arranged and positioned adjacent an insulating surface of the first electrode for discharging the charge accumulated at the surface and establishing the surface at a potential equal to the potential of the second electrode.
    Type: Grant
    Filed: January 3, 1972
    Date of Patent: June 8, 1976
    Assignee: Xerox Corporation
    Inventors: Henry R. Till, Percy Keith Watson