Patents by Inventor Robert J. Nash

Robert J. Nash 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).

  • Insulative magnetic brush developer compositions
    Patent number: 5516614
    Abstract: An insulating developer composition comprised of resin particles, pigment particles, wax component particles, compatibilizer, and a surface additive mixture comprised of metal salts of fatty acids, silica particles, and metal oxide particles; and carrier particles comprised of a ferrite core with a polymer coating or mixture of polymer coatings; and wherein said developer is of a conductivity of from about 10.sup.-14 to about 10.sup.-16 (ohm-cm).sup.-1.
    Type: Grant
    Filed: January 27, 1995
    Date of Patent: May 14, 1996
    Assignee: Xerox Corporation
    Inventors: Robert J. Nash, Cheryl A. Hanzlik, Richard N. Muller, Richard J. Hodgson
  • Conductive developer compositions with surface additives
    Patent number: 5510220
    Abstract: A developer composition comprised of negatively charged toner particles comprised of crosslinked polyester resin particles, pigment particles, and a surface additive mixture comprised of metal salts of fatty acids in an amount of from about 0.2 to about 0.5 weight percent, metal oxide particles in an amount of from about 0.3 to about 1 weight percent, and silica particles in an amount of from about 0.2 to about 0.5 weight percent; and carrier particles comprised of a core with a coating thereover containing a conductive component.
    Type: Grant
    Filed: January 27, 1995
    Date of Patent: April 23, 1996
    Assignee: Xerox Corporation
    Inventors: Robert J. Nash, Cheryl A. Hanzlik, Richard N. Muller, Richard J. Hodgson
  • Conductive developer compositions with wax and compatibilizer
    Patent number: 5506083
    Abstract: A developer composition comprised of a negatively charged toner composition comprised of crosslinked polyester resin particles, pigment particles, wax component particles, a compatibilizer and a surface additive mixture comprised of metal salts of fatty acids, silica particles and metal oxide particles; and carrier particles comprised of a core with a polymer coating or mixture of polymer coatings; and wherein said coating or coatings contain a conductive component.
    Type: Grant
    Filed: January 27, 1995
    Date of Patent: April 9, 1996
    Assignee: Xerox Corporation
    Inventors: Robert J. Nash, Cheryl A. Hanzlik, Richard N. Muller, Richard J. Hodgson
  • Stable conductive developer compositions
    Patent number: 4513074
    Abstract: Disclosed is an improved stable developer composition which contains resin particles, pigment particles, colloidal silica additive particles, fatty acid metal salt additive particles, and uncoated ferrite carrier particles. One preferred specific developer composition disclosed is comprised of (1) first resin particles of styrene methacrylate copolymers, grafted with or containing a low molecular weight wax composition, (2) second resin particles of a styrene, acrylate, acrylonitrile terpolymer, (3) pigment particles, (4) colloidal silica additive particles, (4) fatty acid metal salt additive particles, and (5) uncoated ferrite carrier particles.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: April 23, 1985
    Assignee: Xerox Corporation
    Inventors: Robert J. Nash, Kent A. Randall
  • Conductive developer compositions and processes thereof
    Patent number: H1247
    Abstract: A developer composition with a conductivity of from about 10.sup.-6 to about 10.sup.-12 (ohm-cm).sup.-1 over a toner concentration of from about 1 to about 6 weight percent, which developer is comprised of a toner containing resin particles, pigment particles and a metal salt of a fatty acid; and carrier particles with rough surfaces thereon.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: November 2, 1993
    Inventors: Robert J. Nash, James E. McNamara