Patents by Inventor Walter Mychajlowskij

Walter Mychajlowskij 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).

  • Aryl amine polycondensation polymers
    Patent number: 5419992
    Abstract: A process for the preparation of aryl amine polycondensation polymers useful in electrophotographic imaging members, which process comprises the interfacial polymerization of an aryl amine diol dissolved in an alkaline aqueous phase with a bifunctional acid halide dissolved in an organic solvent, resulting in polymers with high molecular weight and narrow molecular weight distribution (M.sub.w /M.sub.n) of from between about 50,000 to about 350,000, and a M.sub.w /M.sub.n of from about 1 to about 4.
    Type: Grant
    Filed: March 24, 1993
    Date of Patent: May 30, 1995
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, George Liebermann, William W. Limburg, John F. Yanus, Dasarao K. Murti
  • Electrophotographic elements with arylamine polycondensation polymers
    Patent number: 5370955
    Abstract: A process for the preparation of aryl amine polycondensation polymers comprising the interfacial polymerization of an aryl amine diol dissolved in an alkaline aqueous phase, to which has been added a water miscible organic solvent, with a bifunctional acid halide dissolved in a water immiscible organic solvent, and wherein said polymers possess a high molecular weight of from between about 50,000 to about 350,000, and narrow molecular weight distribution M.sub.w /M.sub.n of from about 1 to about 4.
    Type: Grant
    Filed: September 27, 1993
    Date of Patent: December 6, 1994
    Assignee: Xerox Corporation
    Inventors: Alan E. J. Toth, Walter Mychajlowskij, Dale S. Renfer
  • Imaging members having a hydroxy aryl amine charge transport layer
    Patent number: 5342719
    Abstract: An electrophotographic imaging member including a charge generating layer, a charge transport layer with charge transport molecules and as sensitizing additive or dopant a hydroxy derivative of the transport molecule.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: August 30, 1994
    Assignee: Xerox Corporation
    Inventors: Damodar M. Pai, John F. Yanus, Paul J. DeFeo, Alan E. J. Toth, Walter Mychajlowskij, Zoran Popovic
  • Process for producing polycarbonates from nitrogen diol and aromatic diol haloformate.
    Patent number: 5288836
    Abstract: Bishaloformate derivatives of diols, especially bisphenols, are used in a polycondensation reaction under low temperature interfacial polycondensation conditions to obtain high molecular weight polycarbonates or alternating copolycarbonates which are useful as photoreceptor materials.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: February 22, 1994
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, George Liebermann, Dasarao K. Murti
  • Low gloss toner compositions and processes thereof
    Patent number: 5223370
    Abstract: An encapsulated toner composition and process thereof, which toner is comprised of a core comprised of a polymer resin or resins, color pigment, dye, or mixtures thereof, and thereover an inner shell resin comprised, for example, of a polyurea, and thereover an outer shell coating comprised of an alkyl cellulose. The colored encapsulated toners are useful in reprographic processes wherein, for example, low gloss is desired.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: June 29, 1993
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Raj D. Patel, Grazyna Kmiecik-Lawrynowicz, Hock S. Tan, Walter Mychajlowskij
  • Processes for custom color encapsulated toner compositions
    Patent number: 5204208
    Abstract: A process for obtaining custom color toner compositions which comprises admixing at least two encapsulated toners wherein each toner is comprised of a core comprised of a polymer binder, pigment, dye, or mixtures thereof, and a polymeric shell; and wherein the pigment, dye, or mixtures thereof is different for each toner, thereby resulting in a toner with a color different than each of said encapsulated toners.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: April 20, 1993
    Assignee: Xerox Corporation
    Inventors: Anthony J. Paine, Trevor I. Martin, Lurdes M. Martins, Karen A. Moffat, Walter Mychajlowskij
  • Encapsulated toner composition
    Patent number: 5175071
    Abstract: A toner composition comprised of a core comprised of a polymer resin or resins, color pigment, dye, or mixtures thereof, and thereover a coating comprised of an alkyl cellulose.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: December 29, 1992
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Beng S. Ong, Barkev Keoshkerian, Guerino G. Sacripante
  • Encapsulated toner compositions and processes thereof
    Patent number: 5153089
    Abstract: A toner composition comprised of a homogeneous or substantially homogeneous mixture of polymer resin or resins, and color pigments, dyes, or mixtures thereof overcoated with a component derived from the condensation of a cellulose polymer with a silane component.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: October 6, 1992
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Guerino G. Sacripante, Grazyna Kmiecik-Lawrynowicz
  • Encapsulated toners and processes thereof
    Patent number: 5139915
    Abstract: An encapsulated toner composition comprised of a core comprised of a monomer, or monomers which are subsequently polymerized; pigment or dye particles; an emulsifier component selected from the group consisting of organic methyl cellulose and hydroxylated methyl cellulose components into which the pigmented monomer mixture is dispersed, and wherein the core is encapsulated within a polymeric shell.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: August 18, 1992
    Assignee: Xerox Corporation
    Inventors: Karen A. Moffat, Walter Mychajlowskij, Anthony J. Paine, Bing R. Hsieh
  • Encapsulated toner compositions and processes thereof
    Patent number: 5035970
    Abstract: An encapsulated toner composition comprised of a core comprised of pigments or dyes, and a polymer; and wherein the core is encapsulated in a polyester shell with functional groups thereon, and derived from diacid halide polyesters.
    Type: Grant
    Filed: October 2, 1989
    Date of Patent: July 30, 1991
    Assignee: Xerox Corporation
    Inventors: Bing R. Hsieh, Robert J. Gruber, Karen A. Moffat, Walter Mychajlowskij, Anthony J. Paine
  • Low melting encapsulated toners
    Patent number: 4855209
    Abstract: An encapsulated toner composition with a melting temperature of from about 65.degree. C. to about 140.degree. C. comprised of a core containing a polymer selected from the group consisting of polyethylene succinate, polyhalogenated olefins, poly(alpha-alkylstyrenes), rosin modified maleic resins, aliphatic hydrocarbon resins, poly(.epsilon.-caprolactones), and mixtures thereof; and pigment particles, where the core is encapsulated in a shell prepared by interfacial polymerization reactions.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: August 8, 1989
    Assignee: Xerox Corporation
    Inventors: Trevor I. Martin, Marcel P. Breton, Randolph E. Branston, Karen A. Moffat, Walter Mychajlowskij
  • Colored toner compositions
    Patent number: 4778742
    Abstract: A toner composition comprised of resin particles and polymeric dye components of the following formula: ##STR1## wherein A is selected from the group consisting of alkylene and arylene; B is selected from the group consisting of ##STR2## wherein R is selected from the group consisting of an alkylene group, an arylene group and a polyether group; and n represents a number of from 2 to about 100.
    Type: Grant
    Filed: October 7, 1987
    Date of Patent: October 18, 1988
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Lupu Alexandru
  • Colored toner compositions comprising dye chromophores
    Patent number: 4645727
    Abstract: Disclosed is a toner composition comprised of resin particles and covalently bonded polymeric dye chromophores of the following formula: ##STR1## wherein A is selected from the group consisting of alkylene and arylene; B is selected from the group consisting of ##STR2## wherein R is an alkylene group, an arylene or polyether segment; D is selected from the group consisting of dioxyalkane or dioxyarene; x is a fraction number from 0.01 to about 0.50; and y is a fraction number of 0.50 to about 0.99, the sum of x and y being equal to 1.
    Type: Grant
    Filed: April 17, 1986
    Date of Patent: February 24, 1987
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij