Patents by Inventor John Wojtkowicz

John Wojtkowicz 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).

  • Optical sensor for monitoring motion of a blank sheet
    Patent number: 7437120
    Abstract: An apparatus monitors the motion of sheet, such as in a digital printer. An optical sensor is capable of recording an image in a two-dimensional array of pixels, and has acuity to recognize a terrain of a small area on a sheet that is substantially blank to a human eye. The optical sensor views a portion of a sheet moving in a process direction through a path. A detection system compares at least two recorded terrain images from the sheet, thereby directly measuring velocity and direction of the sheet.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: October 14, 2008
    Assignee: Xerox Corporation
    Inventors: Raymond M. Ruthenberg, Mark Muzzin, John Wojtkowicz, Karen Lee, Michel Loiselle, David C. van Wyngaarden
  • Optical mouse sensor for monitoring motion of a sheet
    Publication number: 20060171725
    Abstract: An apparatus monitors the motion of sheet, such as in a digital printer. An optical sensor is capable of recording an image in a two-dimensional array of pixels, and has acuity to recognize a terrain of a small area on a sheet that is substantially blank to a human eye. The optical sensor views a portion of a sheet moving in a process direction through a path. A detection system compares at least two recorded terrain images from the sheet, thereby directly measuring velocity and direction of the sheet.
    Type: Application
    Filed: January 31, 2005
    Publication date: August 3, 2006
    Inventors: Raymond Ruthenberg, Mark Muzzin, John Wojtkowicz, Karen Lee, Michel Loiselle, David van Wyngaarden