Patents Represented by Attorney, Agent or Law Firm E. O. Palallo
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Patent number: 6503680Abstract: A process for the preparation of a latex polymer consistent with E/A (emulsion/aggregation/coalescence) toner manufacture. The process utilizes a standard (universal) latex composition and involves chain-transfer agent partitioning, emulsion polymerization that provides a latex polymer with a wide range of molecular properties. In particular, the process customizes a wide range Mw (weight average molecular weight) latex, without substantially varying the Mn (number average molecular weight) and hence, without substantially varying Tg (glass transition temperature) such that good toner performance is maintained. In a preferred process, a latex polymer is prepared by mixing a seed particle latex, generated by aqueous emulsion polymerization of a first portion of a monomer emulsion, with a second portion of the monomer emulsion and at least one chain-transfer agent.Type: GrantFiled: August 29, 2001Date of Patent: January 7, 2003Assignee: Xerox CorporationInventors: Allan K. Chen, George Liebermann, Tie Hwee Ng, Arthur Helbrecht, Emily L. Moore, Abdisamed Sheik-qasim, Patricia A. Burns, Nam S. Ro
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Patent number: 6451495Abstract: A toner comprised of resin, colorant, and a potassium stearate charge enhancing additive.Type: GrantFiled: May 7, 2001Date of Patent: September 17, 2002Assignee: Xerox CorporationInventors: Robert D. Bayley, Angelo J. Barbetta
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Patent number: 6334890Abstract: An ink composition containing (1) an oxazoline compound with, for example, a melting point of from about above 60° C. to about 120° C. and with, for example, an acoustic-loss value of from about 25 to about 80 dB/mm; (2) a carbamate; (3) an alcohol compound; (4) a lightfastness component; (5) a lightfastness antioxidant; and (6) a colorant.Type: GrantFiled: June 22, 2000Date of Patent: January 1, 2002Assignee: Xerox CorporationInventors: H. Bruce Goodbrand, Danielle C. Boils, Pudupadi R. Sundararajan, Raymond W. Wong, Marcel P. Breton, Shadi L. Malhotra, Carl P. Tripp
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Patent number: 6194110Abstract: A photoconductive imaging member containing a photogenerating layer comprised of a mixture of perylenes, wherein the mixture comprises, for example, (1) 1,3-bis(n-pentylimidoperyleneimido) propane (Formula A), 1,3-bis(2-methylbutylimido peryleneimido)propane (Formula B) and 1-(n-pentylimidoperyleneimido)-3-(2-methylbutylimidoperyleneimido)-propane (Formula C), and (2) an electron acceptor component Formula A 1,3-bis(n-pentylimidoperyleneimido)propane Formula B 1,3-bis(2-methylbutylimidoperyleneimido)propane Formula C 1-(n-pentylimidoperyleneimido)-3-(2-methylbutylimidoperyleneimido)propaneType: GrantFiled: July 13, 2000Date of Patent: February 27, 2001Assignee: Xerox CorporationInventors: Cheng-Kuo Hsiao, Ah-Mee Hor, Giuseppa Baranyi, H. Bruce Goodbrand
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Patent number: 6171702Abstract: A coated xerographic substrate comprised of a substrate with four coating layers, two coating layers on the front side of the substrate and two coating layers on the reverse side of the substrate, wherein said front side coatings are comprised of a antistatic hydrophilic layer in contact with the substrate comprised of a blend of (1) a hydrophilic binder, (2) a water soluble filler, (3) a water insoluble filler, (4) an antistatic cationic component (5) an optional filler dispersant, and (6) an optional biocide, and the second coating situated on top of the first coating comprised of (1) an ester binder,(2) a toner wetting agent, (3) a lightfast UV absorber, (4) a lightfast antioxidant/antiozonant compound, and (5) a filler; and wherein said two coatings in contact with the reverse side of the substrate are comprised of a third hydrophilic antistatic coating comprised of (1) a binder polymer, (2) a water soluble filler, (3) a water insoluble filler, (4) an antistatic agent, (5) a filler dispersant and (6) an oType: GrantFiled: July 17, 1998Date of Patent: January 9, 2001Assignee: Xerox CorporationInventors: Shadi L. Malhotra, Kirit N. Naik
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Patent number: 6132917Abstract: A carrier comprised of a core and thereover a polymer generated from a blend of a polymer containing amine groups and a second polymer containing carboxylic acid functional groups.Type: GrantFiled: March 29, 2000Date of Patent: October 17, 2000Assignee: Xerox CorporationInventors: Thomas R. Hoffend, Robert D. Bayley, Carol A. Fox, John G. VanDusen, Scott M. Silence, K. Derek Henderson
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Patent number: 6127080Abstract: A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic akylene carbonate in the presence of a first catalyst to thereby form a polyalkoxy diol, and (ii) optionally adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst, and (iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid.Type: GrantFiled: March 10, 2000Date of Patent: October 3, 2000Assignee: Xerox CorporationInventors: Guerino G. Sacripante, Daniel A. Foucher, J. Stephen Kittelberger, Dongming Li, Marko D. Saban, Alan E. J. Toth, Robert D. Bayley
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Patent number: 5944650Abstract: 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: GrantFiled: October 29, 1997Date of Patent: August 31, 1999Assignee: Xerox CorporationInventors: Nan-Xing Hu, Paul F. Smith, Beng S. Ong
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Patent number: 5922117Abstract: An ink composition comprised of (1) a liquid alcohol vehicle, (2) a solid alcohol compound, (3) a quaternary compound, (4) a lightfastness UV absorber, (5) a lightfastness antioxidant, and (6) a colorant.Type: GrantFiled: September 23, 1997Date of Patent: July 13, 1999Assignee: Xerox CorporationInventors: Shadi L. Malhotra, Danielle C. Boils
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Patent number: 5763110Abstract: 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: GrantFiled: September 3, 1996Date of Patent: June 9, 1998Assignee: Xerox CorporationInventors: Nan-Xing Hu, Beng S. Ong, Shuang Xie, Zoran D. Popovic, Ah-Mee Hor
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Patent number: 5723244Abstract: A process for the reduction of residual image voltage present on an imaging member which comprises contacting the member with a composition comprised of a nonpolar liquid, thermoplastic resin particles, an optional charge adjuvant, charge control additive, carbon black pigment, and a charge director comprised of a nonpolar liquid soluble organic aluminum complex, or mixtures thereof of the formulas ##STR1## wherein R.sub.1 is selected from the group consisting of hydrogen and alkyl, and n represents a number, and wherein said voltage is reduced to from about zero to about 25 volts.Type: GrantFiled: June 2, 1997Date of Patent: March 3, 1998Assignee: Xerox CorporationInventors: Scott D. Chamberlain, Christopher M. Knapp, David H. Pan
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Patent number: 5688624Abstract: A positively charged liquid developer comprised of a nonpolar liquid, thermoplastic resin particles, pigment, a charge director, and a charge control agent comprised of a PEO:PPO, preferably in a solid form.Type: GrantFiled: January 6, 1997Date of Patent: November 18, 1997Assignee: Xerox CorporationInventors: Scott D. Chamberlain, David H. Pan, Christopher M. Knapp, John W. Spiewak, George A. Gibson, Frank J. Bonsignore
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Patent number: 5607804Abstract: Toners comprised of a mixture of a cyan toner, a magenta toner, a yellow toner, and an optional black toner, each of said toners being comprised of resin and pigment, and wherein the pigment for the cyan toner is a .beta. type copper phthalocyanine, the pigment for the magenta toner is a monoazo lithol rubine, the pigment for the yellow toner is an isoindoline, and the pigment for the black toner is carbon black.Type: GrantFiled: October 12, 1995Date of Patent: March 4, 1997Assignee: Xerox CorporationInventors: Jacques C. Bertrand, Roger N. Ciccarelli, Thomas R. Pickering, Denise R. Bayley
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Patent number: 5552252Abstract: A process for avoiding or minimizing comet formation which comprises dispersing in a magnetic toner comprised of resin particles, a first magnetite, carbon black, charge additive, and wax, a second soft magnetite; and wherein the toner contains a silica surface additive.Type: GrantFiled: March 30, 1995Date of Patent: September 3, 1996Assignee: Xerox CorporationInventors: Douglas A. Lundy, Joseph R. Matalevich, Michael J. Cortash, Michael L. Grande
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Patent number: 5451483Abstract: A liquid developer comprised of a nonpolar liquid, thermoplastic resin particles comprised of a polyalkylene or polyalkylene with pendant acid or ammonium groups thereon, optional pigment, optional charge adjuvant and charge director.Type: GrantFiled: June 30, 1994Date of Patent: September 19, 1995Assignee: Xerox CorporationInventors: Timothy J. Fuller, Ralph A. Mosher, John S. Berkes, John S. Chambers, James R. Larson
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Patent number: 5370955Abstract: 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: GrantFiled: September 27, 1993Date of Patent: December 6, 1994Assignee: Xerox CorporationInventors: Alan E. J. Toth, Walter Mychajlowskij, Dale S. Renfer
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Patent number: 4937164Abstract: A photoresponsive imaging member comprised of a thionated perylene photogeneratoring layer, and a charge transport layer.Type: GrantFiled: June 29, 1989Date of Patent: June 26, 1990Assignee: Xerox CorporationInventors: James M. Duff, Ah M. Hor, Cheng K. Hsiao, Gordon K. Hamer, Rafik O. Loutfy
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Process for the purification of Ti containing polycarbonate with solvent, complexing agent and water
Patent number: 4921940Abstract: A process for the purification of polycarbonates or copolymers thereof containing titanium catalyst residues, which comprises mixing a polycarbonate or copolymers thereof with a solvent; adding to the formed solution mixture a complexing component; admixing the resulting mixture with water; and subsequently separating the polycarbonate or copolymer product therefrom.Type: GrantFiled: August 15, 1988Date of Patent: May 1, 1990Assignee: Xerox CorporationInventors: Peter G. Odell, Giuseppa Baranyi, Lupu Alexandru