Patents by Inventor John G. VanDusen

John G. VanDusen 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).

  • Patent number: 6764799
    Abstract: A carrier comprised of a core and thereover a polymer coating, and which coating is generated by the emulsion polymerization of one or more monomers and a surfactant, and wherein said polymer coating is of a diameter of equal to or less than about 100 nanometers.
    Type: Grant
    Filed: June 20, 2002
    Date of Patent: July 20, 2004
    Assignee: Xerox Corporation
    Inventors: Vladislav Skorokhod, Richard P. N. Veregin, Michael S. Hawkins, John G. VanDusen, Mary L. McStravick, Deepak R. Maniar
  • Publication number: 20030235773
    Abstract: A carrier comprised of a core and thereover a polymer coating, and which coating is generated by the emulsion polymerization of one or more monomers and a surfactant, and wherein said polymer coating is of a diameter of equal to or less than about 100 nanometers.
    Type: Application
    Filed: June 20, 2002
    Publication date: December 25, 2003
    Applicant: Xerox Corporation
    Inventors: Vladislav Skorokhod, Richard P. N. Veregin, Michael S. Hawkins, John G. VanDusen, Mary L. McStravick, Deepak R. Maniar
  • Patent number: 6605404
    Abstract: A process which comprises mixing a carrier core with a polymer core and polymer shell and wherein the polymer shell is present as a coating on said core and said polymer core, wherein said polymer core is generated by emulsification of and heating of monomer forming a seed latex; adding a portion of said seed latex to said emulsification mixture, followed by heating and adding another second portion of said seed latex; and wherein said shell is generated by emulsion polymerization of a monomer, followed by heating.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: August 12, 2003
    Assignee: Xerox Corporation
    Inventors: John G. VanDusen, Thomas R. Hoffend, K. Derek Henderson, Chieh-Min Cheng
  • Publication number: 20030064314
    Abstract: A process which comprises mixing a carrier core with a polymer core and polymer shell and wherein the polymer shell is present as a coating on said core and said polymer core, wherein said polymer core is generated by emulsification of and heating of monomer forming a seed latex; adding a portion of said seed latex to said emulsification mixture, followed by heating and adding another second portion of said seed latex; and wherein said shell is generated by emulsion polymerization of a monomer, followed by heating.
    Type: Application
    Filed: September 28, 2001
    Publication date: April 3, 2003
    Applicant: Xerox Corporation
    Inventors: John G. VanDusen, Thomas R. Hoffend, K. Derek Henderson, Chieh-Min Cheng
  • Patent number: 6251554
    Abstract: A carrier comprised of a core and thereover a polymer generated from (1) a polymer containing amine groups, and (2) a second polymer containing sulfonic functional groups.
    Type: Grant
    Filed: March 29, 2000
    Date of Patent: June 26, 2001
    Assignee: Xerox Corporation
    Inventors: Thomas R. Hoffend, Robert D. Bayley, Carol A. Fox, John G. VanDusen, Scott M. Silence, K. Derek Henderson
  • Patent number: 6132917
    Abstract: A carrier comprised of a core and thereover a polymer generated from a blend of a polymer containing amine groups and a second polymer containing carboxylic acid functional groups.
    Type: Grant
    Filed: March 29, 2000
    Date of Patent: October 17, 2000
    Assignee: Xerox Corporation
    Inventors: Thomas R. Hoffend, Robert D. Bayley, Carol A. Fox, John G. VanDusen, Scott M. Silence, K. Derek Henderson
  • Patent number: 6083652
    Abstract: A carrier composition comprised of a core and coating thereover comprised of a polymer composite, a conductive component, and a matrix resin, and a second resin free of said conductive component.
    Type: Grant
    Filed: March 1, 1999
    Date of Patent: July 4, 2000
    Assignee: Xerox Corporation
    Inventors: Michael J. Duggan, Scott M. Silence, K. Derek Henderson, John G. VanDusen
  • Patent number: 6051353
    Abstract: A carrier comprised of a core and thereover a polymer generated from the reaction of a component containing amine groups and a component containing epoxy groups.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: April 18, 2000
    Assignee: Xerox Corporation
    Inventors: Thomas R. Hoffend, Robert D. Bayley, Carol A. Fox, John G. VanDusen, Scott M. Silence, K. Derek Henderson, Charles H. Honeyman, Paula J. MacLeod, Paul F. Smith, Thomas E. Enright
  • Patent number: 6042981
    Abstract: A composition comprised of a core and thereover a polymer of (1) polystyrene/alkyl methacrylate/dialkylaminoethyl methacrylate, (2) polystyrene/alkyl methacrylate/alkyl hydrogen aminoethyl methacrylate, (3) polystyrene/alkyl acrylate/dialkylaminoethyl methacrylate, or (4) polystyrene/alkyl acrylate/alkyl hydrogen aminoethyl methacrylate.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: March 28, 2000
    Assignee: Xerox Corporation
    Inventors: Angelo J. Barbetta, Robert D. Bayley, Carol A. Fox, Thomas R. Hoffend, Scott M. Silence, K. Derek Henderson, John G. VanDusen
  • Patent number: 6010812
    Abstract: A carrier comprised of a core and a polymer coating of (1) styrene/monoalkylaminoalkyl methacrylate or (2) styrene/dialkylaminoalkyl methacrylate.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: January 4, 2000
    Assignee: Xerox Corporation
    Inventors: Angelo J. Barbetta, Robert D. Bayley, Thomas R. Hoffend, Scott M. Silence, K. Derek Henderson, Carol A. Fox, John G. VanDusen
  • Patent number: 6004712
    Abstract: A carrier comprised of a core and thereover a polymer of (1) methylmethacrylate and a monoalkyl aminoalkyl methacrylate, or (2) a polymer of methylmethacrylate and dialkylaminoalkyl methacrylate.
    Type: Grant
    Filed: August 26, 1998
    Date of Patent: December 21, 1999
    Assignee: Xerox Corporation
    Inventors: Angelo J. Barbetta, Robert D. Bayley, Carol A. Fox, Thomas R. Hoffend, John G. VanDusen, Scott M. Silence, K. Derek Henderson
  • Patent number: 5843612
    Abstract: A toner composition comprised of resin, colorant, wax, and a compatibilizer of the formulaA.sub.(a) --B.sub.(b) --C.sub.(c) --D.sub.(d) --wherein A is ethylene, B is propylene, C is butene, and D is pentene, and wherein the mol fractions are represented by a, b, c, and d, and wherein a is from about 0.05 to about 0.95, b is from about 0.05 to about 0.95, c is from about 0.05 to about 0.95, and d is from about 0.05 to about 0.95, and subject to the provision that the sum of a, b, c, and d are equal to about 1.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: December 1, 1998
    Assignee: Xerox Corporation
    Inventors: Pinyen Lin, John G. VanDusen
  • Patent number: 5805964
    Abstract: An apparatus and process for reducing accumulation of toner from the surface of an electrode member in a development unit of an electrostatographic printing apparatus by providing an inorganic coating on at least a portion of the electrode member.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: September 8, 1998
    Assignee: Xerox Corporation
    Inventors: Santokh S. Badesha, Arnold W. Henry, George J. Heeks, J. Stephen Kittelberger, John G. VanDusen, Suresh K. Ahuja, Merlin E. Scharfe, Richard L. Schank, Mark J. Hirsch
  • Patent number: 5787329
    Abstract: An apparatus and process for reducing accumulation of toner from the surface of an electrode member in a development unit of an electrostatographic printing apparatus by providing an organic coating on at least a portion of the electrode member.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: July 28, 1998
    Assignee: Xerox Corporation
    Inventors: John R. Laing, Edward J. Gutman, J. Stephen Kittelberger, John G. VanDusen, Suresh K. Ahuja, Merlin E. Scharfe, Richard L. Schank, Mark J. Hirsch, Santokh S. Badesha, Arnold W. Henry, George J. Heeks
  • Patent number: 5761587
    Abstract: An apparatus for reducing accumulation of toner from the surface of an electrode member in a development unit of an electrostatographic printing apparatus which includes providing a low surface energy coating on at least a portion of the electrode member.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: June 2, 1998
    Assignee: Xerox Corporation
    Inventors: John R. Laing, Edward J. Gutman, J. Stephen Kittelberger, John G. VanDusen, Suresh K. Ahuja, Merlin E. Scharfe, Richard L. Schank, Mark J. Hirsch, Santokh S. Badesha, Arnold W. Henry, George J. Heeks
  • Patent number: 5146087
    Abstract: Disclosed is a process which comprises providing an imaging apparatus equipped with a path for moving receiver sheets through the apparatus and having infrared sensors situated along said path, incorporating into the imaging apparatus a substantially transparent receiver sheet having coated on at least a portion thereof an infrared absorbing material contained in a polymeric binder, passing the substantially transparent receiver sheet along the path, wherein the infrared sensors detect the presence of the infrared absorbing material on the substantially transparent receiver sheet, and generating an image on the substantially transparent receiver sheet. This process enables the use of substantially transparent receiver sheets in imaging apparatuses employing optical sensors or detectors for locating and/or positioning receiver sheets in the apparatus without the need for opaque strips on the transparencies or separate opaque sheets attached to the transparencies.
    Type: Grant
    Filed: July 23, 1991
    Date of Patent: September 8, 1992
    Assignee: Xerox Corporation
    Inventor: John G. VanDusen
  • Patent number: 4814253
    Abstract: Disclosed is an encapsulated toner composition comprised of (1) domains containing a polymer component having dispersed therein a release composition; and thereover (2) a host resin component comprised of toner resin particles and pigment particles.
    Type: Grant
    Filed: October 29, 1987
    Date of Patent: March 21, 1989
    Assignee: Xerox Corporation
    Inventors: Robert J. Gruber, Raymond A. Yourd, III, Shadi L. Malhotra, John G. Vandusen