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).

  • Patent number: 5863698
    Abstract: A process for the preparation of toner comprising mixing a colorant containing a surfactant and a latex emulsion, and wherein the latex emulsion contains resin and a nonionic hydrolyzable surfactant, and wherein said surfactant is of the Formulas (I) or (II), or optionally mixtures thereof ##STR1## wherein R.sup.1 is a hydrophobic aliphatic, or hydrophobic aromatic group; R.sup.2 is selected from the group consisting of hydrogen, alkyl, aryl, alkylaryl, and alkylarylalkyl; R.sup.3 is hydrogen or alkyl; A is a hydrophilic polymer chain, and m represents the number of A segments; heating below about the resin latex glass transition temperature, followed by the addition of an anionic stabilizer, thereafter heating above about the resin glass transition temperature, and adjusting the pH of the resulting mixture of resin and colorant particles suspended in an aqueous phase containing anionic surfactant, cationic surfactant and nonionic hydrolyzable surfactant, wherein said pH is increased from about 1.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: January 26, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Paul F. Smith, Beverly C. Dutoff, Nan-Xing Hu, Beng S. Ong, Michael A. Hopper
  • Patent number: 5858601
    Abstract: A process for the preparation of toner comprising(i) blending (a) a colorant dispersion containing a first ionic surfactant with (b) a latex emulsion comprised of an aqueous dispersion of core-shell polymer particles with a crosslinked polymer core and a linear polymer shell, and optional nonionic surfactant and a second ionic surfactant with a charge polarity opposite to that of said first ionic surfactant in said colorant dispersion;(ii) heating the resulting mixture at about below the glass transition temperature (Tg) of the linear latex shell polymer to form aggregates; and(iii) subsequently heating said aggregates about above the Tg of the linear latex shell polymer to effect coalescence and fusion of said aggregates.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: January 12, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, T. Hwee Ng, Walter Mychajlowskij, Raj D. Patel, Patricia A. Burns
  • Patent number: 5846666
    Abstract: An electroluminescent device comprised of a metal thioxinoid of the formula ##STR1## wherein M represents a metal; each n is a number of from 1 to 3; N is nitrogen, S is sulfur, and Z represents an aromatic moiety.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: December 8, 1998
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Shuang Xie, Beng S. Ong, Zoran D. Popovic, Ah-Mee Hor
  • Patent number: 5843607
    Abstract: A photoconductive imaging member comprised of a charge transport layer comprised of an indolocarbazole represented by the Formulas (Ia), (IIa), (IIIa), (IVa), (Va), or (VIa); or optionally mixtures thereof: ##STR1## wherein R and R' are independently selected from the group consisting of a hydrogen atom, a halogen atom, alkyl, alkoxyl, and aryl; m and n are numbers of from 0 to 4; R.sup.1 and R.sup.2 are independently selected from the group consisting of alkyl, aryl, vinyl, and diarylaminoaryl; R.sup.3 and R.sup.4 are an atom of hydrogen, alkyl, alkoxy, aryl, or halogen, and p is a number of from 1 to 3.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: December 1, 1998
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Beng S. Ong
  • Patent number: 5827633
    Abstract: A process for the preparation of toner comprising(i) preparing, or providing an aqueous colorant dispersion, which dispersion is comprised of a colorant and an ionic surfactant in water;(ii) blending said colorant dispersion with a latex emulsion comprised of resin particles, a nonionic surfactant, and an ionic surfactant of opposite charge polarity to that of the ionic surfactant in said colorant dispersion;(iii) heating the resulting mixture below about the glass transition temperature (Tg) of the latex resin to form toner sized aggregates;(iv) heating the resulting aggregate suspension of (iii) above about the Tg of the latex resin; and(v) retaining the temperature in the range of from about 30.degree. C. to about 95.degree. C.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: October 27, 1998
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Raj D. Patel
  • Patent number: 5804349
    Abstract: A toner comprised of pigment, and an addition polymer resin generated from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid.
    Type: Grant
    Filed: August 7, 1997
    Date of Patent: September 8, 1998
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, Walter Mychajlowskij, David J. Sanders, T. Hwee Ng
  • Patent number: 5766818
    Abstract: A process for the preparation of toner by mixing a colorant dispersion and a latex emulsion, and wherein the latex emulsion contains resin and a surfactant, wherein the surfactant is, for example, of the Formulas (I) or (II) ##STR1## wherein R.sup.1 is a hydrophobic aliphatic, or hydrophobic aromatic group; R.sup.2 is selected from the group consisting of hydrogen, alkyl, aryl, alkylaryl, and alkylarylalkyl; R.sup.3 is hydrogen or alkyl; A is a hydrophilic polymer, and m represents the number of A segments.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: June 16, 1998
    Assignee: Xerox Corporation
    Inventors: Paul F. Smith, Nan-Xing Hu, Beverly C. Dutoff, Beng S. Ong, Raj D. Patel, Michael A. Hopper
  • Patent number: 5763133
    Abstract: A process for the preparation of toner comprising(i) blending (a) an aqueous pigment dispersion containing a first ionic surfactant and an optional charge control agent with (b) a latex blend comprised of linear polymer and crosslinked polymer particles, optional nonionic surfactant and a second ionic surfactant with a charge polarity opposite to that of said first ionic surfactant in said pigment dispersion;(ii) heating the resulting mixture at about below the glass transition temperature (Tg) of the linear latex polymer to form toner sized aggregates; and(iii) subsequently heating said aggregate suspension about above the Tg of the linear latex polymer to effect fusion or coalescence of said aggregates.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: June 9, 1998
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, David J. Sanders, Stephan V. Drappel
  • Patent number: 5763110
    Abstract: An electroluminescent device comprised of a polynuclear arylamine as represented by the formula (I) wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are aryl groups, A.sup.1 and A.sup.2 are biaryl groups, and P is a hydrocarbon bridge.
    Type: Grant
    Filed: September 3, 1996
    Date of Patent: June 9, 1998
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Beng S. Ong, Shuang Xie, Zoran D. Popovic, Ah-Mee Hor
  • Patent number: 5747205
    Abstract: A photoconductive imaging member comprised of a starburst aromatic amine compound of the formula ##STR1## wherein N is nitrogen; A.sup.1 to A.sup.3 each individually represent biaryl; R.sub.a, R.sub.b, and R.sub.c independently represent one of the groups of the following formulas ##STR2## wherein N is nitrogen; each Ar.sup.1 and Ar.sup.2 are aryl; R.sub.1 to R.sub.8 are substituents independently selected from the group consisting of hydrogen, halogen, hydrocarbon, and alkoxy; and X represents oxygen, sulfur, or an alkylene.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: May 5, 1998
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Ping Liu, Beng S. Ong
  • Patent number: 5747215
    Abstract: A process for the preparation of toner comprising(i) blending (a) a colorant dispersion containing a first ionic surfactant and an optional charge control agent with (b) a latex blend comprised of linear polymer and crosslinked polymer particles, optional nonionic surfactant and a second ionic surfactant with a charge polarity opposite to that of said first ionic surfactant in said colorant dispersion;(ii) heating the resulting mixture at about below the glass transition temperature (Tg) of the linear latex polymer to form toner sized aggregates; and(iii) subsequently heating said aggregate suspension about above the Tg of the linear latex polymer to effect fusion or coalescence of said aggregates, and wherein said linear polymer is of an M.sub.w of from about 20,000 to about 40,000.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: May 5, 1998
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskijj, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, David J. Sanders, Stephan V. Drappel
  • Patent number: 5723669
    Abstract: A process preparation of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine which comprises the reaction of N,N-bis(3,4-dimethylphenyl)amine and an iodobiphenyl in the presence of a ligand copper catalyst, and wherein the ligand is selected from the group consisting of monodentate tertiary amines and bidentate tertiary amines, and which reaction is accomplished at a temperature of from about 120.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: March 3, 1998
    Assignee: Xerox Corporation
    Inventors: H. Bruce Goodbrand, Nan-Xing Hu, Beng S. Ong
  • Patent number: 5723671
    Abstract: A process for the preparation of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine which comprises the reaction of an aminobiphenyl and an iodoxylene in the presence of a ligand copper catalyst, and wherein the ligand is selected from the group consisting of monodentate tertiary amines and bidentate tertiary amines, and which reaction is accomplished at a temperature of from about 120.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: March 3, 1998
    Assignee: Xerox Corporation
    Inventors: H. Bruce Goodbrand, Nan-Xing Hu, Beng S. Ong
  • Patent number: 5705697
    Abstract: A process for the preparation of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine which comprises the reaction of N-(3,4-dimethylphenyl)-4-biphenylamine and an iodoxylene in the presence of a ligated copper catalyst, and wherein the ligand is selected from the group consisting of monodentate tertiary amines and bidentate tertiary amines, and which reaction is accomplished at a temperature of from about 120.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: January 6, 1998
    Assignee: Xerox Corporation
    Inventors: H. Bruce Goodbrand, Nan-Xing Hu, Beng S. Ong
  • Patent number: 5683848
    Abstract: A toner comprised of pigment, and an addition polymer resin generated from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: November 4, 1997
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, Walter Mychajlowskij, David J. Sanders, T. Hwee Ng
  • Patent number: 5679724
    Abstract: An ink for ink jet printing includes an emulsifiable polymer resin and a pigment, and may be made by: (a) combining (1) an emulsion of an emulsifiable polymer resin in an anionic medium with (2) a pigment and a cationic surfactant; and (b) aggregating particles in the mixture of step (a) to a desired particle size, thereby producing a solution of aggregated particles. The particles can optionally be coalesced to alter the particle size of the particles.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: October 21, 1997
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Raj D. Patel, Marcel P. Breton, Michael A. Hopper, Grazyna E. Kmiecik-Lawrynowicz, Beng S. Ong
  • Patent number: 5645968
    Abstract: A process for the preparation of toner comprising(i) preparing, or providing a cationic emulsion resin latex comprised of a resin derived from at least one olefinic nonpolar monomer, a cationic olefinic monomer, a cationic free radical initiator, and optionally a chain transfer agent in an aqueous mixture comprised of a nonionic surfactant and a cationic surfactant, and which mixture is heated at a temperature of from about 60.degree. C. to about 95.degree. C.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: July 8, 1997
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Maureen M. Kedian, Raj D. Patel, Walter Mychajlowskij, Beng S. Ong
  • Patent number: 5585215
    Abstract: A toner comprised of color pigment and an addition polymer resin, and wherein said resin is generated by emulsion polymerization of from 70 to 85 weight percent of styrene, from about 5 to about 20 weight percent of isoprene, from about 1 to about 15 weight percent of acrylate, or from about 1 to about 15 weight percent of methacrylate, and from about 0.5 to about 5 weight percent of acrylic acid.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: December 17, 1996
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Raj D. Patel
  • Patent number: 5582951
    Abstract: A process for the preparation of carrier particles which comprises mixing a dispersion of water, submicron magnetic particles, and ionic surfactant with a latex comprised of resin particles suspended in an aqueous solution containing a surfactant that is counterionic in charge to said ionic surfactant, and a nonionic surfactant; thereafter heating the resulting mixture below about the latex resin glass transition temperature (Tg) while stirring to form aggregates, followed by increasing the temperature of said mixture to about above the latex resin Tg, and subsequently adding additional counterionic or nonionic surfactant solution to minimize, or avoid any further growth in particle size during heating of the mixture about above the latex resin Tg, and wherein said resin Tg is in the range of from between about 45.degree. C. to about 100.degree. C.
    Type: Grant
    Filed: July 3, 1995
    Date of Patent: December 10, 1996
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz, Michael A. Hopper, Walter Mychajlowskij, Beng S. Ong
  • Patent number: 5571654
    Abstract: A negatively charged toner composition comprised of toner resins, colorants, optional surface additives, and a metal charge enhancing additive obtained from the reaction of a metal ion with a molar equivalent of an ortho-hydroxyphenol and two molar equivalents of an aromatic carboxylic acid in an aqueous medium in the presence of a base.
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: November 5, 1996
    Assignee: Xerox Corporation
    Inventor: Beng S. Ong