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).
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Patent number: 6764799Abstract: 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: GrantFiled: June 20, 2002Date of Patent: July 20, 2004Assignee: Xerox CorporationInventors: Vladislav Skorokhod, Richard P. N. Veregin, Michael S. Hawkins, John G. VanDusen, Mary L. McStravick, Deepak R. Maniar
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Publication number: 20030235773Abstract: 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: ApplicationFiled: June 20, 2002Publication date: December 25, 2003Applicant: Xerox CorporationInventors: Vladislav Skorokhod, Richard P. N. Veregin, Michael S. Hawkins, John G. VanDusen, Mary L. McStravick, Deepak R. Maniar
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Patent number: 6605404Abstract: 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: GrantFiled: September 28, 2001Date of Patent: August 12, 2003Assignee: Xerox CorporationInventors: John G. VanDusen, Thomas R. Hoffend, K. Derek Henderson, Chieh-Min Cheng
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Publication number: 20030064314Abstract: 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: ApplicationFiled: September 28, 2001Publication date: April 3, 2003Applicant: Xerox CorporationInventors: John G. VanDusen, Thomas R. Hoffend, K. Derek Henderson, Chieh-Min Cheng
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Patent number: 6251554Abstract: 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: GrantFiled: March 29, 2000Date of Patent: June 26, 2001Assignee: Xerox CorporationInventors: Thomas R. Hoffend, Robert D. Bayley, Carol A. Fox, John G. VanDusen, Scott M. Silence, K. Derek Henderson
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Patent number: 6132917Abstract: 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: GrantFiled: March 29, 2000Date of Patent: October 17, 2000Assignee: Xerox CorporationInventors: Thomas R. Hoffend, Robert D. Bayley, Carol A. Fox, John G. VanDusen, Scott M. Silence, K. Derek Henderson
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Patent number: 6083652Abstract: 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: GrantFiled: March 1, 1999Date of Patent: July 4, 2000Assignee: Xerox CorporationInventors: Michael J. Duggan, Scott M. Silence, K. Derek Henderson, John G. VanDusen
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Patent number: 6051353Abstract: 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: GrantFiled: September 7, 1999Date of Patent: April 18, 2000Assignee: Xerox CorporationInventors: 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
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Patent number: 6042981Abstract: 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: GrantFiled: August 26, 1998Date of Patent: March 28, 2000Assignee: Xerox CorporationInventors: Angelo J. Barbetta, Robert D. Bayley, Carol A. Fox, Thomas R. Hoffend, Scott M. Silence, K. Derek Henderson, John G. VanDusen
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Patent number: 6010812Abstract: A carrier comprised of a core and a polymer coating of (1) styrene/monoalkylaminoalkyl methacrylate or (2) styrene/dialkylaminoalkyl methacrylate.Type: GrantFiled: August 26, 1998Date of Patent: January 4, 2000Assignee: Xerox CorporationInventors: Angelo J. Barbetta, Robert D. Bayley, Thomas R. Hoffend, Scott M. Silence, K. Derek Henderson, Carol A. Fox, John G. VanDusen
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Patent number: 6004712Abstract: 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: GrantFiled: August 26, 1998Date of Patent: December 21, 1999Assignee: Xerox CorporationInventors: Angelo J. Barbetta, Robert D. Bayley, Carol A. Fox, Thomas R. Hoffend, John G. VanDusen, Scott M. Silence, K. Derek Henderson
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Patent number: 5843612Abstract: 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: GrantFiled: September 2, 1997Date of Patent: December 1, 1998Assignee: Xerox CorporationInventors: Pinyen Lin, John G. VanDusen
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Patent number: 5805964Abstract: 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: GrantFiled: April 29, 1997Date of Patent: September 8, 1998Assignee: Xerox CorporationInventors: 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
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Patent number: 5787329Abstract: 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: GrantFiled: April 29, 1997Date of Patent: July 28, 1998Assignee: Xerox CorporationInventors: 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
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Patent number: 5761587Abstract: 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: GrantFiled: April 29, 1997Date of Patent: June 2, 1998Assignee: Xerox CorporationInventors: 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
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Patent number: 5146087Abstract: 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: GrantFiled: July 23, 1991Date of Patent: September 8, 1992Assignee: Xerox CorporationInventor: John G. VanDusen
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Patent number: 4814253Abstract: 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: GrantFiled: October 29, 1987Date of Patent: March 21, 1989Assignee: Xerox CorporationInventors: Robert J. Gruber, Raymond A. Yourd, III, Shadi L. Malhotra, John G. Vandusen