Patents by Inventor Allen W. Lee

Allen W. Lee 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 web machine servo drive system
    Patent number: 3991992
    Abstract: A web drive system consisting of two independent speed controlled servos used to drive at least two webs is provided for use in a photoelectrophoretic web machine. The servo drive systems cooperate in the transporting of the webs to eliminate speed differential tensions between the two webs held together by friction and electrical tacking force. The first servo system may be bi-polar controlled. The second servo system may be uni-polar controlled and switched between speed and torque control modes. When the webs are held apart, the second servo system will be in speed control and whenever the webs are in contact, the second servo system is switched to the torque control mode.
    Type: Grant
    Filed: April 24, 1975
    Date of Patent: November 16, 1976
    Assignee: Xerox Corporation
    Inventors: John M. Randall, Leroy A. Baldwin, John M. Schneider, Allen W. Lee