Patents by Inventor Cyrus B. Clarke

Cyrus B. Clarke 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).

  • Systems for performing laser beam linearity correction and algorithms and methods for generating linearity correction tables from data stored in an optical scanner
    Patent number: 7639407
    Abstract: Laser beam scan line nonlinearity is compensated for by providing algorithms for generating linearity profiles which are used by a corresponding registration system in an electrophotographic device to determine the placement of Pels across a scan line.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: December 29, 2009
    Assignee: Lexmark International, Inc.
    Inventors: Cyrus B. Clarke, William P. Corbett, Thomas A. Fields, Christopher D. Jones
  • Systems and methods for adjusting the dynamic range of a scanning laser beam
    Patent number: 7403214
    Abstract: The dynamic range of an electrophotographic device may be shifted by calibrating a laser power of a laser source to operate within a first range of power levels during a laser power adjustment operation. At least one laser control parameter is modified after calibrating the laser power so that the laser source is operable within a second range of power levels different from the first range of power levels and a beam emitted by the laser source is controlled within the second range of power levels when the beam is directed towards an image area of a photoconductive surface.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: July 22, 2008
    Assignee: Lexmark International, Inc.
    Inventors: Thomas A. Fields, Christopher D. Jones, William P. Cook, Cyrus B. Clarke, Jonathan C. Frey
  • Algorithms and methods for determining laser beam process direction position errors from data stored on a printhead
    Patent number: 7349123
    Abstract: Systems and methods are provided for characterizing laser beam process direction position errors in an electrophotographic device. Once the process direction position errors of a given beam laser beam system have been characterized, an image is adjusted or warped prior to being processed by the laser beam system to compensate for laser beam process direction position errors, e.g., bow and skew.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: March 25, 2008
    Assignee: Lexmark International, Inc.
    Inventors: Cyrus B. Clarke, Thomas A. Fields, Allen P. Johnson, Christopher D. Jones
  • Apparatus with flash memory control for revision
    Patent number: 5502797
    Abstract: Printer (1) receives revised operating code in flash memory (19). To preserve offset adjustment unique to the printer, the values in new operating code are compared with those in the previous code, and new offsets preserving the previous offsets are stored in permanent memory (21). The use of permanent memory is minimized by basing the calculation on changes from start of production.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: March 26, 1996
    Assignee: Lexmark International, Inc.
    Inventors: Craig P. Bush, Cyrus B. Clarke, David B. Langer