Patents by Inventor Roger W. LaForce

Roger W. LaForce 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).

  • Process for controlling alloy fractionation
    Patent number: 5075191
    Abstract: Disclosed is a process for treating particles of selenium alloy to reduce fractionation when the particles are subsequently vacuum evaporated onto a substrate which comprises (1) heating particles of an alloy of selenium and an alloying component selected from the group are exposed to oxygen; (2) exposing the particles to water vapor; and (3) subjecting the particles previously exposed to oxygen and water vapor to a vacuum. Also disclosed is a process which comprises (1) providing particles of an alloy of selenium and an alloying component selected from the group consisting of tellurium, arsenic, and mixtures thereof; (2) forming selenium oxide on the surfaces of the particles; (3) converting the selenium oxide on the particle surfaces to selenious acid; and (4) removing the selenious acid from the particle surfaces.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: December 24, 1991
    Assignee: Xerox Corporation
    Inventors: Roger W. LaForce, Lawrence E. Kowalczyk, Santokh S. Badesha, Paul F. Zukoski, Monroe J. Hordon, Steven M. Sterling, Barry A. Lees, Fred A. Elder
  • Processes for preparing chalcogenide alloys
    Patent number: 5035857
    Abstract: A process for the preparation of chalcogenide alloys which comprises crystallizing a chalcogenide alloy, grinding and pelletizing the crystallized product, and evaporating the alloy on, for example, a supporting substrate to form a photoreceptor.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: July 30, 1991
    Assignee: Xerox Corporation
    Inventors: Lawrence E. Kowalczyk, Santokh S. Badesha, Paul F. Zukoski, Monroe J. Hordon, Steven M. Sterling, Barry A. Lees, Frederick A. Elder, Roger W. LaForce
  • Processes for preparing chalcogenide alloys
    Patent number: 5002734
    Abstract: A process for the preparation of chalcogenide alloys which comprises crystallizing a chalcogenide alloy, grinding and pelletizing the crystallized product, and evaporating the alloy on, for example, a supporting substrate to form a photoreceptor.
    Type: Grant
    Filed: January 31, 1989
    Date of Patent: March 26, 1991
    Assignee: Xerox Corporation
    Inventors: Lawrence E. Kowalczyk, Santokh S. Badesha, Paul F. Zukoski, Monroe J. Hordon, Steven M. Sterling, Barry A. Lees, Frederick A. Elder, Roger W. LaForce
  • Elimination of streamer formation in positive charging corona devices
    Patent number: 4731633
    Abstract: Method and apparatus for applying a periodic negative voltage to a coronode for the prevention of a streaming phenomenon in electrographic devices. A negative polarity voltage signal is applied periodically to the bare wire coronode of a positive corona charging device. The negative polarity voltage signal is believed to prevent the formation of streamer sites associated with the pepper tracking copy quality defect. The negative polarity voltage signal is applied to the coronode in a manner having a minimal effect on charging functions.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: March 15, 1988
    Assignee: Xerox Corporation
    Inventors: Geoffrey M. T. Foley, Roger W. LaForce, Conrad J. Bell, Thomas W. Cherry