Patents by Inventor James Christopher Piotrowski

James Christopher Piotrowski 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).

  • Apparatus and method of reducing charge roller contamination
    Patent number: 7899384
    Abstract: An image forming equipment, e.g., a laser printer includes a photoconductive (PC) drum and an associated charge roller and incorporates a conductive polymer cleaner blade having an electrical potential to sufficiently charge contamination particles on the PC drum to electrically repel from a charged surface, such as the charge roller.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: March 1, 2011
    Assignee: Lexmark International, Inc.
    Inventors: Matthew David Heid, James Christopher Piotrowski, Joshua Carl Poterjoy, Donald Wayne Stafford
  • Apparatus and Method of Reducing Charge Roller Contamination
    Publication number: 20100111581
    Abstract: The present invention relates generally to image forming equipment, e.g., a laser printer of the type which includes a photoconductive (PC) drum and an associated charge roller. The invention is disclosed in exemplary embodiment as a laser printer incorporating a cleaner element with an electrical potential to sufficiently charge contamination particles on the PC drum to electrically repel from a charged surface, such as the charge roller.
    Type: Application
    Filed: November 5, 2008
    Publication date: May 6, 2010
    Inventors: Matthew David Heid, James Christopher Piotrowski, Joshua Carl Poterjoy, Donald Wayne Stafford
  • Roller with mechanical properties influenced by rotation
    Patent number: 7386249
    Abstract: A roller capable for use as a developer roller in a printer including a roll body having a surface, wherein the roller provides a first surface flexibility (SF1) when the roller rotates in one direction and a second surface flexibility (SF2) when said roller rotates in a second direction.
    Type: Grant
    Filed: June 7, 2005
    Date of Patent: June 10, 2008
    Assignee: Lexmark International, Inc.
    Inventors: Reginald Keith Bethel, Jarrett Clark Gayne, James Christopher Piotrowski
  • Cleaning member for charging device
    Patent number: 7356278
    Abstract: The present invention relates to printing devices and particularly to devices and a method for the reduction of contamination on a charging device. A cleaning member is supplied that has a cleaning material affixed to a substrate. The cleaning material is positioned to contact the charge roller and the substrate is flexed to provide an elastic response.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: April 8, 2008
    Assignee: Lexmark International, Inc.
    Inventors: James Christopher Piotrowski, Donald Wayne Stafford, DeAndre Stevis Thompson
  • Method of mitigating toner damage in high speed contact developing with end seal
    Patent number: 6985683
    Abstract: A developer roller (5) is rotated rapidly for high speed printing, which can cause excessive heating at end seal (1). Heat damage to toner (24) is avoided by providing gaps (30a, 30b) under the seals (1) which reduce the stiffness of developer roller (5) and thereby reduce frictional heating.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: January 10, 2006
    Assignee: Lexmark International, Inc.
    Inventors: Mark Duane Foster, James Christopher Piotrowski