Mail Patents (Class 104/181)
  • Photoelectrophoretic imaging process employing dark charge injecting element
    Patent number: 3967960
    Abstract: An improved photoelectrophoretic imaging method is disclosed wherein the imaging suspension is brought into contact under a first electrical field with a blocking layer having a coating which interacts, in the dark, with the pigment particles of the imaging suspension so as to provide a uniformly charged imaging suspension. The imaging suspension is then exposed to appropriate electromagnetic radiation while under a second electrical field. A second blocking layer, free of said coating is employed to produce positive and negative images.
    Type: Grant
    Filed: October 21, 1974
    Date of Patent: July 6, 1976
    Assignee: Xerox Corporation
    Inventors: P. Keith Watson, Paul J. Cressman, Richard V. LaDonna