Patents by Inventor Raj D. Patel

Raj D. Patel 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).

  • Publication number: 20030180649
    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: Application
    Filed: March 25, 2002
    Publication date: September 25, 2003
    Applicant: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Joseph Bartel, Edward G. Zwartz
  • Publication number: 20030180650
    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: Application
    Filed: March 25, 2002
    Publication date: September 25, 2003
    Applicant: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper
  • Publication number: 20030180648
    Abstract: A process which involves the heating of a magnetite dispersion, a colorant dispersion, a latex emulsion, and a coagulant, wherein the coagulant can be a polymetal halide, and the mixture is aggregated by heating below the latex resin glass transition temperature, and thereafter heating above the latex resin glass transition temperature, followed by cooling and isolating the product, which product can be a toner.
    Type: Application
    Filed: March 25, 2002
    Publication date: September 25, 2003
    Applicant: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Vladislav Skorokhod, Richard P. N. Veregin, Michael S. Hawkins, Paul j. Gerroir
  • Publication number: 20030180651
    Abstract: An emulsion aggregation process for the preparation of a magnetite toner, and where the magnetite can function as a coagulant.
    Type: Application
    Filed: March 25, 2002
    Publication date: September 25, 2003
    Applicant: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper
  • Patent number: 6617092
    Abstract: An emulsion aggregation process for the preparation of a magnetite toner, and where the magnetite can function as a coagulant.
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: September 9, 2003
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper
  • Publication number: 20030165767
    Abstract: A process comprising heating a latex, a colorant dispersion, a polytetrafluoroethylene dispersion, and an organo metallic complexing component.
    Type: Application
    Filed: March 1, 2002
    Publication date: September 4, 2003
    Applicant: Xerox Corporation
    Inventors: Raj D. Patel, Valerie M. Farrugia, Daryl Vanbesien, Edward G. Zwartz
  • Publication number: 20030162119
    Abstract: A process for the preparation of toner by, for example, mixing a latex with a colorant mixture comprised of colorant, an ionic surfactant, and a polytetrafluoroethylene; adding a coagulant; heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin; adding a stabilizer; heating above about the Tg of the latex resin; and isolating the toner.
    Type: Application
    Filed: March 20, 2003
    Publication date: August 28, 2003
    Applicant: Xerox Corporation
    Inventors: Daryl Vanbesien, Raj D. Patel, Michael A. Hopper, Stephan V. Drappel
  • Patent number: 6582873
    Abstract: A toner process including, for example, mixing a latex with a colorant wherein the latex contains resin and an ionic surfactant, and the colorant contains a surfactant and a colorant; adding a polyaluminum chloride; affecting aggregation by heating; adding a chelating component and a base wherein the base increases the pH of the formed aggregates; heating the resulting mixture to accomplish coalescence; and isolating the toner.
    Type: Grant
    Filed: June 5, 2002
    Date of Patent: June 24, 2003
    Assignee: Xerox Corporation
    Inventors: Lu Jiang, Nan-Xing Hu, Raj D. Patel, Walter Mychajlowskij, Michael A. Hopper
  • Patent number: 6576389
    Abstract: A process for the preparation of toner by, for example, mixing a colorant, a latex, a wax and a dual coagulant mixture comprising water solubilized silica with an alumina coating referred to as aluminized silica and a polyaluminum chloride to provide, for example, a toner composition of different gloss levels when fused.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: June 10, 2003
    Assignee: Xerox Corporation
    Inventors: Daryl Vanbesien, Raj D. Patel, Michael A. Hopper, David J. Sanders, Kurt I. Halfyard, Danielle C. Boils
  • Patent number: 6562541
    Abstract: A process for the preparation of toner by, for example, mixing a latex with a colorant mixture comprised of colorant, an ionic surfactant, and a polytetrafluoroethylene; adding a coagulant; heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin; adding a stabilizer; heating above about the Tg of the latex resin; and isolating the toner.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: May 13, 2003
    Assignee: Xerox Corporation
    Inventors: Daryl Vanbesien, Raj D. Patel, Michael A. Hopper, Stephan V. Drappel
  • Publication number: 20030073024
    Abstract: A process for the preparation of toner by, for example, mixing a colorant, a latex, a wax and a dual coagulant mixture comprising water solubilized silica with an alumina coating referred to as aluminized silica and a polyaluminum chloride to provide, for example, a toner composition of different gloss levels when fused.
    Type: Application
    Filed: October 15, 2001
    Publication date: April 17, 2003
    Applicant: Xerox Corporation
    Inventors: Daryl Vanbesien, Raj D. Patel, Michael A. Hopper, David J. Sanders, Kurt I. Halfyard, Danielle C. Boils
  • Patent number: 6549327
    Abstract: Disclosed is a display comprising an arrangement of a plurality of optically anisotropic rotatable elements, each of the rotatable elements having a surface in contact with an enabling fluid, the rotatable elements being electrically dipolar in the presence of the enabling fluid and thus being subject to rotation upon application of an electric field, the rotatable elements being free to rotate in place but not free to translate substantially so as to disrupt the arrangement of rotatable elements, wherein a first portion of the surface contains a mixture of a chelating agent and a spiropyran material of the formula wherein n is an integer representing the number of repeat —CH2— units and R is —H or —CH═CH2, and wherein a second portion of the surface contains substantially no spiropyran.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: April 15, 2003
    Assignee: Xerox Corporation
    Inventors: Daniel A. Foucher, Raj D. Patel, Naveen Chopra, Peter M. Kazmaier, Erwin Buncel, James Wojtyk
  • Patent number: 6541175
    Abstract: A process involving, for example, providing or generating an emulsion latex comprised of sodio sulfonated polyester resin particles by adding with shearing to the latex a colorant dispersion comprising from about 20 to about 50 percent of a predispersed colorant in water, followed by the addition of an organic or an inorganic acid; heating the resulting mixture at a temperature of from about 45° C. to about 65° C. followed by the addition of an water insoluble metal salt or water insoluble metal oxide thereby releasing metal ions and permitting aggregation and coalescence, resulting in toner particles; and optionally cooling the mixture and isolating the product.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: April 1, 2003
    Assignee: Xerox Corporation
    Inventors: Lu Jiang, Walter Mychajlowskij, Guerino G. Sacripante, Raj D. Patel, Michael A. Hopper
  • Publication number: 20030059704
    Abstract: A process for the preparation of toner by, for example, mixing a latex with a colorant mixture comprised of colorant, an ionic surfactant, and a polytetrafluoroethylene; adding a coagulant; heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin; adding a stabilizer; heating above about the Tg of the latex resin; and isolating the toner.
    Type: Application
    Filed: September 24, 2001
    Publication date: March 27, 2003
    Applicant: Xerox Corporation
    Inventors: Daryl Vanbesien, Raj D. Patel, Michael A. Hopper, Stephen V. Darappel
  • Patent number: 6517618
    Abstract: Disclosed is an electrophoretic ink comprising a suspending fluid and, suspended in the suspending fluid, a plurality of particles comprising a mixture of a chelating agent and a spiropyran material of the formula wherein n is an integer representing the number of repeat —CH2— units and R is —H or —CH═CH2, the particles being free to migrate within the suspending fluid under the influence of an electric field.
    Type: Grant
    Filed: May 24, 2001
    Date of Patent: February 11, 2003
    Assignee: Xerox Corporation
    Inventors: Daniel A. Foucher, Raj D. Patel, Naveen Chopra, Peter M. Kazmaier, James Wojtyk, Erwin Buncel
  • Publication number: 20030018100
    Abstract: An ink composition containing a vehicle, a colorant and an alkali sulfonated polyester-amine resin composition generated, for example, from the reaction of an organic diol, an organic diacid, an alkali sulfonated diacid and an amino-organic diacid.
    Type: Application
    Filed: April 19, 2001
    Publication date: January 23, 2003
    Applicant: Xerox Corporation.
    Inventors: Daniel A. Foucher, Walter Mychajlowskij, Raj D. Patel, Guerino G. Sacripante
  • Publication number: 20030002132
    Abstract: Disclosed is an electrophoretic ink comprising a suspending fluid and, suspended in the suspending fluid, a plurality of particles comprising a mixture of a chelating agent and a spiropyran material of the formula 1
    Type: Application
    Filed: May 24, 2001
    Publication date: January 2, 2003
    Applicant: Xerox Corporation
    Inventors: Daniel A. Foucher, Raj D. Patel, Naveen Chopra, Peter M. Kazmaier, James Wojtyk, Erwin Buncel
  • Patent number: 6500597
    Abstract: A process for the preparation of chemical toner by mixing a colorant, a latex, optionally a wax, and a first coagulant of, for example, a polyaluminum sulfosilicate and a second cationic coagulant of, for example, a benzylalkonium chloride.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: December 31, 2002
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Lori A. Rettinger, Michael A. Hopper
  • Patent number: 6495302
    Abstract: A toner process including, for example, mixing a latex with a colorant wherein the latex contains resin and an ionic surfactant, and the colorant contains a surfactant and a colorant; adding a polyaluminum chloride; affecting aggregation by heating; adding a chelating component and a base wherein the base increases the pH of the formed aggregates; heating the resulting mixture to accomplish coalescence; and isolating the toner.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: December 17, 2002
    Assignee: Xerox Corporation
    Inventors: Lu Jiang, Nan-Xing Hu, Raj D. Patel, Walter Mychajlowskij, Michael A. Hopper
  • Publication number: 20020186450
    Abstract: Disclosed is a display comprising an arrangement of a plurality of optically anisotropic rotatable elements, each of the rotatable elements having a surface in contact with an enabling fluid, the rotatable elements being electrically dipolar in the presence of the enabling fluid and thus being subject to rotation upon application of an electric field, the rotatable elements being free to rotate in place but not free to translate substantially so as to disrupt the arrangement of rotatable elements, wherein a first portion of the surface contains a mixture of a chelating agent and a spiropyran material of the formula 1
    Type: Application
    Filed: May 24, 2001
    Publication date: December 12, 2002
    Applicant: Xerox Corporation
    Inventors: Daniel A. Foucher, Raj D. Patel, Naveen Chopra, Peter M. Kazmaier, Erwin Buncel, James Wojtyk