Patents by Inventor Robert K. Fox

Robert K. Fox 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).

  • DC pin scorotron charging apparatus, and printing machine arranged with the same
    Patent number: 6459873
    Abstract: In DC pin scorotron charging apparatus for charging a photoreceptor to a final voltage, a first DC pin scorotron charging device initially charges the photoreceptor to an intermediate overshoot voltage and a second DC pin scorotron charging device thereafter uniformly charges the photoreceptor to the final voltage. The first DC pin scorotron charging device provides a generally high percent open control grid area, a generally high emitter slope, and a generally high emitter pin current. The second DC pin scorotron charging device provides a generally low percent open control grid area, a generally low emitter slope, and a generally low emitter pin current.
    Type: Grant
    Filed: November 15, 2000
    Date of Patent: October 1, 2002
    Assignee: Xerox Corporation
    Inventors: Jing Qing Song, John F. Obrien, David Sekovski, Robert K. Fox, John D. McCaffrey, Jeffrey W. Drawe