Patents by Inventor Beng S. Ong

Beng S. Ong 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).

  • Toner compositions with zinc and boron charge enhancing additives
    Patent number: 5538829
    Abstract: A negatively charged toner composition comprised of a polymer resin or polymer resins, colorants comprised of pigment particles and/or dyes, optional surface additives, and a boron charge enhancing additive obtained from the reaction of an alkylboric acid or an arylboric acid and an N-alkyl- or N-aryl-substituted bis(hydroxyalkyl)amine, or a zinc charge enhancing additive obtained from the reaction of an aromatic carboxylic acid and an N-alkyl- or N-aryl-substituted bis(hydroxyalkyl)amine with a zinc ion-containing compound in aqueous medium.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, H. Bruce Goodbrand
  • Toner compositions with negative charge enhancing additives
    Patent number: 5532098
    Abstract: A toner composition comprised of toner resins, colorants, optional surface additives, and a charge enhancing additive obtained from the reaction of an aluminum ion-containing compound with a molar equivalent of an aromatic carboxylic acid, and an excess of an N-alkyl or N-aryl-substituted bis(hydroxyalkyl)amine in an aqueous medium at a temperature ranging from about 25.degree. C. to about 100.degree. C.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: July 2, 1996
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Preparative processes for dihydroxygermanium phthalocyanine
    Patent number: 5491228
    Abstract: A process for the preparation of dihydroxygermanium phthalocyanine, polymorphic Type III, which comprises treating dihalogermanium phthalocyanine or dialkoxygermanium phthalocyanine with a strong acid, followed by treatment with water, optionally washing with a dilute aqueous base and water, and subsequently optionally admixing with a solvent mixture comprised of a strong organic acid and aprotic organic solvent.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: February 13, 1996
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Cheng-Kuo Hsiao
  • Photoconductive imaging members with acetoxymetal phthalocyanines
    Patent number: 5441837
    Abstract: An imaging member comprised of an optional supporting substrate, a photogenerator layer, and a charge transport layer, and wherein the photogenerator layer is comprised of acetoxymetal phthalocyanine pigments as essentially represented by the formula ##STR1## where R is acetyl, haloacetyl, or mixtures thereof; R' is alkyl, alkoxy, cyano, halogen, or mixtures thereof; M is a metal selected from the group consisting of aluminum, gallium, silicon, germanium and indium; x is 1 or 2; and y is 0, 1 or 2.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: August 15, 1995
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Cheng-Kuo Hsiao
  • Electrophotographic imagimg member with enhanced photo-electric sensitivity
    Patent number: 5437950
    Abstract: An electrophotographic imaging member including a substrate, an optional blocking layer, an optional thermoplastic adhesive interface layer, a thin charge generation layer comprising pigment particles dispersed in a film forming polymer binder having dissolved or molecularly dispersed therein an electron accepting/transporting compound, and a charge transport layer.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: August 1, 1995
    Assignee: Xerox Corporation
    Inventors: Robert C. U. Yu, Beng S. Ong
  • Toner compositions with metal chelate charge enhancing additives
    Patent number: 5409794
    Abstract: A toner composition comprised of polymers, pigment particles and/or dyes, optional surface additives, and a charge enhancing additive derived from the reaction of a metal, a metal carbonyl, a metal salt, or a metal oxide, with a .beta.-diketone, a .beta.-keto ester, or a malonic ester in an aqueous medium or organic medium.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: April 25, 1995
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Toner compositions with aluminum complex composite charge additives
    Patent number: 5391453
    Abstract: A negatively charged toner composition comprised of resin, colorants comprised of color pigments and/or dyes, optional surface additives, and an aluminum complex composite charge enhancing additive obtained from the reaction of an aqueous aluminum ion solution with a phenol, a hydroxybenzoic acid and a base at a temperature ranging from about 25.degree. C. to about 100.degree. C.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: February 21, 1995
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Hydroxygermanium phthalocyanine processes
    Patent number: 5382493
    Abstract: A process for the preparation of Type II dihydroxygermanium phthalocyanine which comprises treating dihalogermanium phthalocyanine or dialkoxygermanium phthalocyanine with a strong acid, followed by treatment with water, and subsequent optional washing with an organic base and an aprotic organic solvent.
    Type: Grant
    Filed: August 12, 1993
    Date of Patent: January 17, 1995
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Terry L. Bluhm, Cheng-Kuo Hsiao, Duff James M.
  • Low gloss encapsulated compositions
    Patent number: 5334471
    Abstract: A toner composition comprised of a core comprised of a polymer resin or resins, low remanence-magnetite of from between about 0.1 to about 8 gauss with an average volume particle diameter of from between about 2 to about 6 microns, and a light scattering component with an average particle diameter of from between about 2 to about 6 microns; and which core is encapsulated in a polymeric shell.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: August 2, 1994
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Grazyna Kmiecik-Lawrynowicz, Beng S. Ong
  • Toner compositions with aluminum negative charge enhancing additives
    Patent number: 5332636
    Abstract: A negatively charged toner composition comprised of resin, colorants comprised of color dyes or pigment particles, optional surface additives, and an aluminum charge enhancing additive obtained from the reaction of aluminum ions with either four molar equivalents of an orthohydroxyphenol and a base, or two molar equivalents, each of an orthohydroxyphenol and a phenol, and a base.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: July 26, 1994
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Encapsulated toner compositions and processes thereof
    Patent number: 5324616
    Abstract: An in situ process for the preparation of encapsulated toner compositions which comprises dispersing a mixture of a cyclic olefin or cyclic olefins, pigments, dyes or mixtures thereof in an aqueous medium containing a surfactant thereby forming a stable microdroplet suspension, and thereafter adding a catalyst to effect a metathesis polymerization of the cyclic olefin or olefins to form the encapsulated toner resin.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: June 28, 1994
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Barkev Keoshkerian, Beng S. Ong
  • Encapsulated toner compositions
    Patent number: 5304448
    Abstract: An encapsulated toner composition comprised of a core comprised of a polymer binder and pigment, encapsulated in a shell derived from the polycondensation of a polyisocyanate and amino acid with an amide or hydroxy functionality.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: April 19, 1994
    Assignee: Xerox Corporation
    Inventors: Barkev Keoshkerian, Beng S. Ong, Padam K. Angra
  • Toner compositions with negative charge enhancing complexes
    Patent number: 5302481
    Abstract: A negatively charged toner composition comprised of resin, pigment particles and/or dyes, optional surface additives, and an aluminum complex charge enhancing additive obtained from the reaction of aluminum ion with two molar equivalents, each of an ortho-hydroxybenzoic acid and an ortho-hydroxyphenol in the presence of a base.
    Type: Grant
    Filed: June 7, 1993
    Date of Patent: April 12, 1994
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Toner compositions with negative charge enhancing additives
    Patent number: 5300387
    Abstract: A negatively charged toner composition comprised of a polymer or polymers, a colorant or colorants, optional surface additives, and a metal complex charge enhancing additive obtained from the reaction of a hydroxybenzoic acid and a base with a mixture of a metal ion and an aromatic dicarboxylic acid.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: April 5, 1994
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Toner compositions with zinc complex charge enhancing additives
    Patent number: 5290651
    Abstract: A negatively charged toner composition comprised of a polymer resin or polymer resins, colorants comprised of pigment particles and/or dyes, optional surface additives, and a nonionic zinc complex charge enhancing additive containing two different ligands derived from an ortho-hydroxyphenol and an ortho-hydroxybenzoic acid.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: March 1, 1994
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Toner compositions with metal complex charge enhancing additives
    Patent number: 5275900
    Abstract: A negatively charged toner composition comprised of a polymer or polymer resins, a colorant or colorants, optional surface additives, and a metal complex charge enhancing additive obtained from the reaction of a hydroxybenzoic acid and a base with a mixture of a metal ion and a hydroxyphenol.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: January 4, 1994
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Lurdes M. Martins
  • Photoconductive imaging members with ladder polymers
    Patent number: 5248580
    Abstract: A photoconductive imaging member comprised of a supporting substrate, a photogenerating layer comprised of a ladder polymer selected from the group consisting of those represented by the following formulas: ##STR1## and mixtures thereof, wherein n represents the number of segments, and a charge transport layer.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: September 28, 1993
    Assignees: Xerox Corporation, University of Rochester
    Inventors: Milan Stolka, Martin A. Abkowitz, Beng S. Ong, Samson A. Jenekhe
  • Toner compositions with sulfone charge enhancing additives
    Patent number: 5238768
    Abstract: A negatively charged toner composition comprised of resin particles, colorants, optional surface additives, and a dihydroxyaryl sulfone charge enhancing additive, or an unsymmetrical hydroxyaryl sulfone charge enhancing additive obtained from the condensation of sulfuric acid with a molar equivalent of a phenol, followed by condensation with a second phenol, or from the condensation of an aromatic sulfonic acid with a phenol.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: August 24, 1993
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong
  • Encapsulated toner compositions
    Patent number: 5215855
    Abstract: An encapsulated toner composition comprised of a core comprised of polymer resins, and colorants, which core is encapsulated within a polymer shell containing a siloxane component.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: June 1, 1993
    Assignee: Xerox Corporation
    Inventors: Barkev Keoshkerian, Beng S. Ong
  • Microcapsule toner compositions
    Patent number: 5213934
    Abstract: Microcapsule toners comprise a polymeric shell and a core containing colorants and a polymer binder. Part of the polymer binder is chemically grafted to the shell polymer. A process of preparing the microcapsule toners involves a shell forming interfacial polycondensation and a core binder forming free radical polymerization. The grafting of core binder to the shell is accomplished via the involvement of a polyfunctional reagent capable of reacting with both the shell and core monomers, or involvement of a shell monomer bearing a core monomer functionality.
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: May 25, 1993
    Assignee: Xerox Corporation
    Inventors: Guerino Sacripante, Beng S. Ong, Bing R. Hsieh, Robert McNamara