Patents by Inventor John Gary Shaw

John Gary Shaw 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).

  • System and method for sub-pixel ink drop adjustment for process direction registration
    Patent number: 8814300
    Abstract: A method of operating an inkjet printer reduces ink drop placement errors in a process direction. The method includes generating firing signals for inkjets in a printhead at a first frequency and initiating the generation of the firing signals to a first plurality of inkjets in the printhead at a second frequency, the first frequency being greater than the second frequency.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: August 26, 2014
    Assignee: Xerox Corporation
    Inventors: Helen HaeKyung Shin, David A. Mantell, Jeffrey J. Folkins, Patricia J. Donaldson, John Gary Shaw
  • System and Method for Sub-Pixel Ink Drop Adjustment for Process Direction Registration
    Publication number: 20140015882
    Abstract: A method of operating an inkjet printer reduces ink drop placement errors in a process direction. The method includes generating firing signals for inkjets in a printhead at a first frequency and initiating the generation of the firing signals to a first plurality of inkjets in the printhead at a second frequency, the first frequency being greater than the second frequency.
    Type: Application
    Filed: July 16, 2012
    Publication date: January 16, 2014
    Applicant: XEROX CORPORATION
    Inventors: Helen HaeKyung Shin, David A. Mantell, Jeffrey J. Folkins, Patricia J. Donaldson, John Gary Shaw
  • Systems and methods for momentum controlled scavengeless jumping development in electrophotographic marking devices
    Patent number: 7580648
    Abstract: To generate a toner cloud in a development system, a first potential is applied to a donor roll for a first pulse time to project toner from the donor roll toward a photoreceptor; a second potential is applied to the donor roll for a second pulse time to slow the speed at which the toner is projected toward the photoreceptor; a third potential is applied to the donor roll for a third pulse time to hold toner between the donor roll and the photoreceptor; and a fourth potential is applied to the donor roll for a fourth pulse time to urge undeveloped toner to the surface of the donor roll. Voltages may also be applied for selectivity removing toner from a donor roll.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: August 25, 2009
    Assignee: Xerox Corporation
    Inventors: John Gary Shaw, Paul W. Morehouse, Jr.
  • SYSTEMS AND METHODS FOR MOMENTUM CONTROLLED SCAVENGELESS JUMPING DEVELOPMENT IN ELECTROPHOTOGRAPHIC MARKING DEVICES
    Publication number: 20080240758
    Abstract: To generate a toner cloud in a development system, a first potential is applied to a donor roll for a first pulse time to project toner from the donor roll toward a photoreceptor, a second potential is applied to the donor roll for a second pulse time to slow the speed at which the toner is projected toward the photoreceptor; a third potential is applied to the donor roll for a third pulse time to hold toner between the donor roll and the photoreceptor; and a fourth potential is applied to the donor roll for a fourth pulse time to urge undeveloped toner to the surface of the donor roll. Voltages may also be applied for selectivity removing toner from a donor roll.
    Type: Application
    Filed: March 27, 2007
    Publication date: October 2, 2008
    Applicant: XEROX CORPORATION
    Inventors: John Gary Shaw, Paul W. Morehouse