Patents by Inventor Stephen Ferris Randall

Stephen Ferris Randall 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).

  • Systems and methods for setting up grid voltages in a tandem pin charging device
    Patent number: 7031628
    Abstract: Systems and methods for setting up grid voltage for a tandem pin charging device for charging a photoreceptor in a xerographic printing machine. A charge-generating emitter ratio of a first charging unit is determined and a first grid voltage is set based on the charge-generating emitter ratio of the first charging unit. A charge-generating emitter ratio of a offset voltage is then determined and a second grid voltage is set, based on the determined charge-generating emitter ratio of the offset voltage. A final voltage of a photoreceptor is then compared with a final target voltage.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: April 18, 2006
    Assignee: Xerox Corporation
    Inventors: David Sekovski, Jing Qing Song, John Francis O'Brien, Stephen Ferris Randall, Song-Feng Mo