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).

  • Wax containing colorants
    Patent number: 5994020
    Abstract: A toner process which comprises mixing(i) a colorant dispersion, and a(ii) a nonionic surfactant, an ionic surfactant or mixtures thereof, with(iii) a latex comprised of resin and a mixture of anionic surfactant and a nonionic surfactant;(iv) heating the resulting blend of (iii) about equal to, or below about the glass transition temperature (Tg) of the resin; and(v) optionally adding additional anionic surfactant to the resulting aggregated suspension of (iv);(vi) heating the resulting mixture of (v) about equal to, or above about the Tg of the resin and(vii) isolating the toner.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: November 30, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Paul F. Smith, Beng S. Ong, Allan K. Chen
  • Organic electroluminescent devices
    Patent number: 5989737
    Abstract: An organic electroluminescent (EL) device comprised, in the following sequence, of an anode, an organic hole injecting and hole transporting layer, an organic electron injecting and electron transporting layer, and a cathode, wherein said organic hole injecting and transporting layer is comprised of a mixture of a tertiary aromatic amine and a polycyclic aromatic hydrocarbon compound.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: November 23, 1999
    Assignee: Xerox Corporation
    Inventors: Shuang Xie, Nan-Xing Hu, Zoran D. Popovic, Ah-Mee Hor, Beng S. Ong
  • Modified emulsion aggregation processes
    Patent number: 5977210
    Abstract: A process for the preparation of ink compositions comprising the emulsion polymerization of monomer, water, surfactant, and initiator with stirring and heating to provide a latex; mixing therewith a pigment dispersion of pigment particles, water, and cationic surfactant; blending the mixture; thereafter stirring the mixture; and subsequently adding additional anionic surfactant to stabilize the aggregate particles.
    Type: Grant
    Filed: January 30, 1995
    Date of Patent: November 2, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Marcel P. Breton, Michael A. Hopper, Grazyna E. Kmiecik-Lawrynowicz, Beng S. Ong
  • Polyester toner compositions and processes thereof
    Patent number: 5962177
    Abstract: A toner composition comprised of a pigment, and a linear polyester resin of the formula ##STR1## where R' is independently selected from the group consisting of phenylene, cyclohexylene, and alkylene with from 4 to about 24 carbon atoms, where R is an oxyalkylene group of the formula ##STR2## where R" is independently selected from the group hydrogen and hydrocarbon substituents with from 1 to about 24 carbon atoms, n is an integer from about 2 to about 10,000, and m is an integer from about 2 to about 10,000.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: October 5, 1999
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Walter Mychajlowskij, Beng S. Ong
  • Electroluminescent devices
    Patent number: 5952115
    Abstract: An organic electroluminescent (EL) device with a charge transport component of an indolocarbazole compound represented by Formulas (I) or (II) ##STR1## wherein R and R' are independently selected from the group consisting of hydrogen, alkyl, alkoxyl, aryl, and halogen; m and n are numbers from 0 to 4; A.sup.1 and A.sup.2 are arylene; Ar.sup.1, Ar.sup.2, Ar.sup.3, and Ar.sup.4 are aryl; R.sup.1 and R.sup.2 are independently selected from the group consisting of hydrogen, alkyl, alkoxyl, aryl, and halogen; and p is a number from 1 to 3.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: September 14, 1999
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
  • Surfactants
    Patent number: 5944650
    Abstract: A surfactant composition represented by Formulas (I), (II) or (III); or optionally mixtures thereof ##STR1## wherein R.sup.1 is a hydrophobic moiety of alkyl or aryl, and wherein alkyl contains from about 4 to about 60 carbon atoms and aryl contains from about 6 to about 60 carbon atoms; R.sup.2 is selected from the group consisting of alkyl and aryl, wherein alkyl contains from 1 to about 60 carbon atoms and aryl contains from about 6 to about 60; R.sup.3 is hydrogen or alkyl of from 1 to about 10 carbon atoms; A is a hydrophilic polymer chain; m is the number of repeating segments of the hydrophilic polymer chain and is a number of from about 2 to about 500.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: August 31, 1999
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Paul F. Smith, Beng S. Ong
  • Indolocarbazole electroluminescent devices
    Patent number: 5942340
    Abstract: An organic electroluminescent device member comprised of a charge transport component of an indolocarbazole represented by Formulas (I), (II), (III), (IV), (V), or (VI); or optionally mixtures thereof ##STR1## wherein R and R' are independently selected from the group consisting of a hydrogen atom, halogen atom, alkyl, alkoxyl, and aryl; m and n are numbers of 0 to 4; R.sup.1 and R.sup.2 are independently selected from the group consisting of alkyl, aryl, and vinyl; R.sup.3 and R.sup.4 are independently selected from the group consisting of a hydrogen atom, halogen atom, alkyl, alkoxy, and aryl, and p is a number from 1 to 3.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: August 24, 1999
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
  • Ink jet inks containing toner particles as colorants
    Patent number: 5936008
    Abstract: An ink for ink jet printing includes a liquid vehicle comprising water and toner particles with a colorant dispersed in or associated with the toner particles. The ink composition combines the print quality advantages of xerographic printing with the economic advantages of ink jet printing, thereby providing waterfast, archival quality prints.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: August 10, 1999
    Assignee: Xerox Corporation
    Inventors: Robert N. Jones, Edward J. Radigan, Jr., Susan Robinette, Raj D. Patel, Michael A. Hopper, Grazyna E. Kmiecik-Lawrynowicz, Garland J. Nichols, Beng S. Ong
  • Electroluminescent devices
    Patent number: 5932363
    Abstract: A luminescent composition containing a mixture of a fluorescent material and a metal chelate compound of the formulaL.sub.n --M.sup.+n (I)wherein M represents a metal; n is a number of from 1 to 3, and L is a ligand of the formula ##STR1## wherein Ar is an aryl; X is selected from the group consisting of oxygen, sulfur, and selenium; N is nitrogen; O is oxygen, and Z is a suitable aromatic component.
    Type: Grant
    Filed: October 2, 1997
    Date of Patent: August 3, 1999
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
  • Toner adsorption processes
    Patent number: 5928832
    Abstract: A process for the preparation of toner comprising mixing a colorant dispersion and a latex emulsion, and wherein there is accomplished a heating below about or equal to about the resin latex glass transition temperature to form aggregates followed by heating above about or equal to about the resin glass transition temperature to coalesce the aggregates; separating the toner formed, and subsequently adding to the toner in the form of a slurry a mixture of monomer and cleavable surfactant, cleaving the surfactant under basic conditions, and allowing the monomer to adsorb on the toner, then polymerizing and cooling, and wherein the cleavable 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.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: July 27, 1999
    Assignee: Xerox Corporation
    Inventors: Paul F. Smith, Beng S. Ong, T. Hwee Ng
  • Electroluminescent devices
    Patent number: 5925472
    Abstract: A metal chelate compound of the formulaL.sub.n --M.sup.+n (I)wherein M represents a metal; n is an integer, or number of from 1 to 3; and L is a ligand of ##STR1## wherein Ar is aryl; X is selected from the group consisting of oxygen, sulfur, and selenium; N is nitrogen; O is oxygen; and Z is a suitable aromatic component.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: July 20, 1999
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Shuang Xie, Zoran D. Popovic, Beng S. Ong, Ah-Mee Hor
  • Toner process with cationic salts
    Patent number: 5919595
    Abstract: A process for the preparation of toner comprising mixing an emulsion latex, a colorant dispersion, and monocationic salt, and which mixture possesses an ionic strength of from about 0.001 molar (M) to about 5 molar, and optionally cooling.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: July 6, 1999
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Daniel A. Foucher, Guerino G. Sacripante, Raj D. Patel, Beng S. Ong
  • Surfactant free toner processes
    Patent number: 5916725
    Abstract: A process for the preparation of toner comprising mixing an amine, an emulsion latex containing sulfonated polyester resin, and a colorant dispersion, heating the resulting mixture, and optionally cooling.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: June 29, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Walter Mychajlowskij, Daniel A. Foucher, Guerino G. Sacripante, Beng S. Ong
  • Toner compositions with acrylonitrile and processes
    Patent number: 5910387
    Abstract: A toner composition comprised of colorant, and an addition polymer resin of styrene, butadiene, acrylonitrile and acrylic acid.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: June 8, 1999
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Beng S. Ong, Emily L. Moore, Raj D. Patel
  • Toner processes
    Patent number: 5902710
    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: August 12, 1998
    Date of Patent: May 11, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Raj D. Patel
  • Electroluminescent devices
    Patent number: 5891587
    Abstract: An organic electroluminescent (EL) device comprised of a starburst aromatic amine compound represented by 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 represent independently one of the functional groups of the following formulae ##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: April 6, 1999
    Assignee: Xerox Corporation
    Inventors: Nan-Xing Hu, Shuang Xie, Beng S. Ong, Zoran D. Popovic, Ah-Mee Hor, Ping Liu
  • Photoconductive imaging members
    Patent number: 5874193
    Abstract: A photoconductive imaging member comprised of a supporting substrate, a hole blocking layer thereover, a photogenerating layer and a charge transport layer, and wherein the hole blocking layer is comprised of a crosslinked siloxane polymer schematically represented by ##STR1## wherein A, B, and C are the repeating units on the polymer backbone; D and E are divalent linkages; R' and P" are selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, cyano, nitro, alkyl, alkoxy, acyl, alkoxycarbonyl, and aryloxycarbonyl; and x, y, and z are the molar fractions of the repeating monomer units such that the sum of x+y+z equal to about 1.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: February 23, 1999
    Assignee: Xerox Corporation
    Inventors: Ping Liu, Nan-Xing Hu, H. Bruce Goodbrand, Cheng-Kuo Hsiao, Beng S. Ong
  • Photoconductive imaging members
    Patent number: 5871877
    Abstract: A photoconductive imaging member comprised of a supporting substrate, a hole blocking layer thereover, a photogenerating layer and a charge transport layer, and wherein the hole blocking layer is comprised of a crosslinked polymer material schematically represented by structure (VII), and is derived from crosslinking a mixture of electron transport polymer (I) and organosilane (II).
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: February 16, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Ping Liu, Cheng-Kuo Hsiao
  • Toner compositions and processes thereof
    Patent number: 5869215
    Abstract: A process for the preparation of toner including(i) blending an aqueous colorant dispersion with a latex blend comprised of a linear polymer and a soft crosslinked polymer;(ii) heating the resulting mixture at about below, or about equal to the glass transition temperature (Tg) of the linear latex polymer to form aggregates; and(iii) subsequently heating said aggregate suspension about above, or about equal to the Tg of the linear latex polymer to effect fusion or coalescence of said aggregates.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: February 9, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Patricia A. Burns, Raj D. Patel, David J. Sanders
  • Toner processes
    Patent number: 5869216
    Abstract: A process for the preparation of toner comprising blending an aqueous colorant dispersion and a latex emulsion containing resin; heating the resulting mixture at a temperature below about the glass transition temperature (Tg) of the latex resin to form toner sized aggregates; heating said resulting aggregates at a temperature above about the Tg of the latex resin to effect fusion or coalescence of the aggregates; redispersing said toner in water at a pH of above about 7; contacting the resulting mixture with a metal halide or salt, and then with a mixture of an alkaline base and a salicylic acid, a catechol, or mixtures thereof at a temperature of from about 25.degree. C. to about 80.degree. C.; and optionally isolating the toner product, washing, and drying.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: February 9, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Raj D. Patel, Patricia A. Burns, Richard P. N. Veregin