Patents Represented by Attorney E. O. Palazzo

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  • Carrier compositions
    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
  • Organic devices
    Patent number: 6759146
    Abstract: An electroluminescent device containing a number of layers with a mixed region of a hole transport compound, and an electron transport compound, and hole and electron transport regions.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: July 6, 2004
    Assignee: Xerox Corporation
    Inventors: Hany Aziz, Nan-Xing Hu, Ah-Mee Hor, Zoran D. Popovic
  • Development system coatings
    Patent number: 6759125
    Abstract: A coated transport roll comprised of a core with a coating comprised of a charge transporting polymer and an oxidizing agent.
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: July 6, 2004
    Assignee: Xerox Corporation
    Inventors: Dan A. Hays, Joseph Mammino, Damodar M. Pai, Donald S. Sypula, William H. Wayman, John F. Yanus, Paul J. DeFeo
  • Toner processes
    Patent number: 6756176
    Abstract: A process comprising heating a resin latex and a colorant below about the glass transition temperature (Tg) of the resin; adding a metal stearate; and isolating the product; and wherein the heating generates an alkyl carboxylate metal salt component ionically attached to the surface of the product.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: June 29, 2004
    Assignee: Xerox Corporation
    Inventors: Reza Stegamat, Valerie M. Farrugia, Richard P. N. Veregin
  • Organic light emitting devices
    Patent number: 6753098
    Abstract: An electroluminescence (EL) device containing a number of layers, including two electrodes and positioned between the electrodes a mixed region, a hole transport region, and an electron transport region, wherein the mixed region contains, for example, biphenyl TPD, an electron transport compound and a luminescent compound.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: June 22, 2004
    Assignee: Xerox Corporation
    Inventors: Hany Aziz, Nan-Xing Hu, Cuong Vong, Ah-Mee Hor, Zoran D. Popovic
  • Toner processes
    Patent number: 6749980
    Abstract: A process for the preparation of toner comprising generating a latex emulsion of resin, water, and an ionic surfactant, and a colorant dispersion of a surface modified colorant and water, and wherein the latex emulsion is blended with the surface modified colorant dispersion; heating the resulting mixture below or equal to about the glass transition temperature (Tg) of the latex resin to form aggregates; optionally adding a second latex comprised of submicron resin particles suspended in an aqueous phase resulting in a shell or coating wherein the shell is optionally of from about 0.1 to about 1 micron in thickness, and wherein optionally the shell coating is contained on 100 percent of the aggregates; heating the resulting aggregate suspension above about the Tg of the latex resin; and optionally isolating the toner.
    Type: Grant
    Filed: May 20, 2002
    Date of Patent: June 15, 2004
    Assignee: Xerox Corporation
    Inventors: Chieh-Min Cheng, Allan K. Chen
  • Opamp with infinite open loop gain
    Patent number: 6750714
    Abstract: An operational amplifier circuit connected to a bi-directional cascode current amplifier is disclosed. The operational amplifier uses the bi-directional cascode current amplifier to filter out the common-mode signal resulting in a nearly infinite open loop gain without bandwidth degradation.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: June 15, 2004
    Assignee: Xerox Corporation
    Inventor: Harry Jonathan McIntyre
  • Red organic light emitting devices
    Patent number: 6737177
    Abstract: An organic light emitting, or EL device containing a number of layers, and containing red emitting compounds or components.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: May 18, 2004
    Assignee: Xerox Corporation
    Inventors: Hany Aziz, Nan-Xing Hu, Zoran D. Popovic, Ah-Mee Hor
  • Drum heater
    Patent number: 6713728
    Abstract: A drum heater consisting of a plurality of vanes made preferably from mica material and having multiple separate heater wire channels controlled from an electrical cable is provided for heating the interior of a printer drum or fuser. The drum heater has element wires, which can be operated in two different modes, and which are wound around eight mica vanes. The mica vanes are held together on both ends with mica end caps for assembly, electrical isolation and thermal isolation. The mica vanes additionally define protruding tabs for attachment of wire restraining and protecting mica panels.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: March 30, 2004
    Assignee: Xerox Corporation
    Inventors: Patrick B. Justice, Larry E. Hindman, Trevor J. Snyder, Michael P. O'Dierno, Jeffrey R. Kohne
  • Photoconductive members
    Patent number: 6713220
    Abstract: A photoconductive imaging member comprised of a supporting substrate, a photogenerating layer and a charge transport layer, and wherein said charge transport layer contains a component that substantially prevents light of a wavelength of about equal to or about less than 700 nanometers from interaction with said photogenerating layer.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: March 30, 2004
    Assignee: Xerox Corporation
    Inventors: John F. Graham, Zoran D. Popovic, Ah-Mee Hor, James M. Duff, Satchidanand Mishra
  • Document security processes
    Patent number: 6673500
    Abstract: A process comprising applying a toner security mark on a document generated by xerographic means, and which mark possesses white glossy characteristics, and wherein said toner is comprised of a waterborne polymer resin and a colorant, and optionally a second security mark generated by a toner comprised of a waterborne polymer resin and a UV fluorescent component.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: January 6, 2004
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Fatima M. Mayer, Michael A. Hopper, Kurt I. Halfyard
  • Document security processes
    Patent number: 6664017
    Abstract: A process comprising applying a toner security mark on a document generated by xerographic means and which mark possesses white glossy characteristics, and wherein said toner is comprised of a polymer and a colorant.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: December 16, 2003
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, H. Bruce Goodbrand, Kurt I. Halfyard, Nan-Xing Hu
  • Imaging members
    Patent number: 6656650
    Abstract: A member including, for example, a supporting layer and a single photogenerating layer, the photogenerating layer comprising particles including hydroxygallium phthalocyanine phthalocyanine Type V, x polymorph metal free phthalocyanine, or chlorogallium phthalocyanine dispersed in a matrix comprising an arylamine hole transporter and an electron transporter selected from the group consisting of N,N′bis(1,2-dimethylpropyl)-1,4,5,8-naphthalenetetracarboxylic diimide, 1,1′-dioxo-2-(4-methylphenyl)-6-phenyl-4-(dicyanomethylidene)thiopyran, and a quinone selected from the group consisting of carboxybenzylhaphthaquinone, and tetra (t-butyl) diphenoquinone, and mixtures thereof, and submicrometer size polytetrafluroethylene particles, and a film forming binder.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: December 2, 2003
    Assignee: Xerox Corporation
    Inventors: Liang-Bih Lin, Helen R. Cherniack, John S. Chambers, Anna M. Main, Huoy-Jen Yuh, Cindy C. Chen, James M. Duff, Timothy P. Bender
  • Magnetite toner processes
    Patent number: 6656658
    Abstract: A toner process comprising heating an acidified dispersion of an acicular magnetite, a carbon black colorant dispersion, an optional wax dispersion, and an acicular latex.
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: December 2, 2003
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Joseph Bartel, Edward G. Zwartz
  • Photoconductive members
    Patent number: 6656651
    Abstract: A component containing a supporting substrate, and thereover a layer comprised of a alkylimido-monobenzamidazole-perinone-perylene or a bisalkylimido-perinone-perylene of the alternative following formulas wherein each of R1, R2 and R3 are, for example, independently alkyl or aryl.
    Type: Grant
    Filed: May 22, 2002
    Date of Patent: December 2, 2003
    Assignee: Xerox Corporation
    Inventors: Timothy P. Bender, James M. Duff, Cuong Vong, Gordon K. Hamer
  • Electrophotographic imaging members
    Patent number: 6645686
    Abstract: An electrophotographic imaging member comprises a substrate, a charge generating layer, and a charge transport layer. The charge transport layer comprises a binder and charge transport molecules, wherein the binder eliminates or minimizes crystallization of the charge transport molecules. Optionally, an electrophotographic imaging member comprises a substrate and a single charge generating and charge transport layer. The single charge generating and charge transport layer comprises a binder, charge generating molecules and charge transport molecules, wherein the binder eliminates or minimizes crystallization of the charge transport molecules. Specific binders are PCZ-800, a PCZ-500, or a PCZ-400 polycarbonate resin.
    Type: Grant
    Filed: July 23, 2002
    Date of Patent: November 11, 2003
    Assignee: Xerox Corporation
    Inventors: Min-Hong Fu, Colleen A. Helbig, Kent J. Evans, Kathleen M. Carmichael, June E. Schneider, David M. Skinner, Alfred H. Willnow
  • Imaging members
    Patent number: 6645687
    Abstract: A process comprising forming chlorogallium phthalocyanine (ClGaPc) in N-methyl-2-pyrrolidinone (NMP) to provide a ClGaPc (NMP) Type I; separately dry milling and then wet treating the Type I product to form Type II ClGaPc (NMP); blending the ClGaPc Type II product with hydroxygallium phthalocyanine (HOGaPc) Type V and a resin to form a coating mixture; coating the resulting mixture to form a photoconductive charge generator layer.
    Type: Grant
    Filed: May 10, 2002
    Date of Patent: November 11, 2003
    Assignee: Xerox Corporation
    Inventors: Cuong Vong, George Liebermann, Richard A. Burt, Ah-Mee Hor
  • Toner processes
    Patent number: 6638677
    Abstract: A process comprising heating a latex, a colorant dispersion, a polytetrafluoroethylene dispersion, and an organo metallic complexing component.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: October 28, 2003
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Valerie M. Farrugia, Daryl Vanbesien, Edward G. Zwartz
  • Toner processes
    Patent number: 6627373
    Abstract: An emulsion aggregation process for the preparation of a magnetite toner, and where the magnetite can function as a negatively charged coagulant to facilitate aggregation of a basic cationic latex, a cationic carbon black dispersion and a cationic wax dispersion.
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: September 30, 2003
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper
  • Hollow cylindrical imaging member treatment process with solid carbon dioxide pellets
    Patent number: 6627002
    Abstract: A process for treating an electrostatographic imaging member including providing a hollow cylindrical electrostatographic imaging member having an interior surface, a coated outer surface, a first end and a second end, the interior surface at at least the first end having a coating of adhesive material securing a first end flange to the first end, and propelling solid carbon dioxide pellets against the first end flange and coating of adhesive material with sufficient force to remove the first end flange and coating of adhesive material from the interior surface at at least the first end of the hollow cylindrical electrostatographic imaging member.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: September 30, 2003
    Assignee: Xerox Corporation
    Inventors: Richard P. Millonzi, Robert S. Foltz, Richard C. Petralia, Leslie W. Caccamise, Harold F. Hammond, David P. Crump, Robert E. McCumiskey, Edward C. Williams