Patents by Inventor Mark P. Haefner

Mark P. Haefner 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).

  • Dynamic control of thermal expansion induced imaging errors from light emitting diode (LED) print bars
    Patent number: 9463641
    Abstract: A method for dynamically compensating for thermal expansion and contraction of a light emitting diode print bar having first and second light emitting diodes having first and second ideal positions, respectively, the method including: a) determining a first measured position of the first light emitting diode and a second measured position of the second light emitting diode; b) comparing the first measured position and the second measured position to the first ideal position and the second ideal position, respectively; and, c) correcting a first difference between the first measured position and the first ideal position and a second difference between the second measured position and the second ideal position based on results from the step of comparing.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: October 11, 2016
    Assignee: Xerox Corporation
    Inventors: Mark P. Haefner, Paul A. Hosier, Roger L. Triplett, Terri A. Clingerman
  • DYNAMIC CONTROL OF THERMAL EXPANSION INDUCED IMAGING ERRORS FROM LIGHT EMITTING DIODE (LED) PRINT BARS
    Publication number: 20160279967
    Abstract: A method for dynamically compensating for thermal expansion and contraction of a light emitting diode print bar having first and second light emitting diodes having first and second ideal positions, respectively, the method including: a) determining a first measured position of the first light emitting diode and a second measured position of the second light emitting diode; b) comparing the first measured position and the second measured position to the first ideal position and the second ideal position, respectively; and, c) correcting a first difference between the first measured position and the first ideal position and a second difference between the second measured position and the second ideal position based on results from the step of comparing.
    Type: Application
    Filed: March 27, 2015
    Publication date: September 29, 2016
    Inventors: Mark P. Haefner, Paul A. Hosier, Roger L. Triplett, Terri A. Clingerman
  • Printing system with extended color gamut
    Patent number: 7305200
    Abstract: A printing system includes a marking engine which applies colorants to a print medium to render an image. The marking engine has a single pass color gamut which the marking engine is capable of rendering in a single pass of the print medium through the marking engine. The marking engine is capable of rendering an extended color gamut in a plurality of passes of the print medium through the marking engine. A control system is associated with the marking engine. The control system identifies an image which falls outside the single pass color gamut of the marking engine and schedules a plurality of passes for rendering the image.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: December 4, 2007
    Assignee: Xerox Corporation
    Inventors: Matthew F Hoffman, Paul M. Butterfield, Mark P. Haefner, Christopher J. Degroff