Patents by Inventor Lupu Alexandru
Lupu Alexandru 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).
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Patent number: 5274057Abstract: An improved process for producing resin particles by a bead suspension polymerization reaction, and a polymer formed by the process wherein the process comprises: providing a liquid reaction medium suitable for conducting the polymerization; forming a suspension agent system in the reaction medium by an in situ interaction of at least two components in the reaction medium, for example, certain water soluble metal halides and polyvinylacetate derived polymers; adding at least one polymerizable monomer compound to the resulting reaction medium having the suspension agent system dispersed therein; and effecting polymerization of the monomer in the reaction medium to form low ash content beads of the polymer.Type: GrantFiled: December 23, 1991Date of Patent: December 28, 1993Assignee: Xerox CorporationInventors: Michael K. Georges, Robert D. Bayley, Lupu Alexandru
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Patent number: 5155193Abstract: Process for the preparation of polymers which comprises a suspension free radical polymerization of monomers in the presence of the initiator O,O-t-amyl-O-(2-ethylhexyl)monoperoxycarbonate.Type: GrantFiled: July 2, 1990Date of Patent: October 13, 1992Assignee: Xerox CorporationInventors: Michael K. Georges, Peter G. Odell, Lupu Alexandru
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Patent number: 5122187Abstract: Disclosed are hot melt ink compositions suitable for ink jet printing which comprise a colorant, a binder, and a propellant selected from the group consisting of hydrazine; cyclic amines; ureas; carboxylic acids; sulfonic acids; aldehydes; ketones; hydrocarbons; esters; phenols; amides; imides; halocarbons; urethanes; ethers; sulfones; sulfamides; sulfonamides; phosphites; phosphonates; phosphates; alkyl sulfides; alkyl acetates; and sulfur dioxide.Type: GrantFiled: January 17, 1991Date of Patent: June 16, 1992Assignee: Xerox CorporationInventors: William M. Schwarz, Robert H. Marchessault, Lupu Alexandru, Bernard Henrissat
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Patent number: 5114820Abstract: A toner composition comprised of pigment particles and a branched polyalkyl/styrene/butadiene copolymer of the following formula ##STR1## wherein m, n and o are weight fraction numbers, p represents the number of CH.sub.2 groups, R is hydrogen or alkyl, and R' is carbonyloxy or aryl.Type: GrantFiled: October 27, 1989Date of Patent: May 19, 1992Assignee: Xerox CorporationInventors: Michael K. Georges, Lupu Alexandru
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Patent number: 5082919Abstract: A toner composition comprised of a crosslinked thermotropic liquid crystalline polymer, a branched liquid crystalline polymer, or mixtures thereof.Type: GrantFiled: July 30, 1990Date of Patent: January 21, 1992Assignee: Xerox CorporationInventors: Guerino Sacripante, T. Brian McAneney, Stephan Drappel, Sheau Van Kao, Lupu Alexandru
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Patent number: 5039773Abstract: Thermotropic liquid crystalline polymers represented by the formulas as illustrated in FIGS. 1 and 2 wherein m, n, and o represent the number of monomer segments present; and x, y, and z are independently selected from the group consisting of alkyl, substituted alkyl, alkylene, and substituted alkylene.Type: GrantFiled: October 2, 1989Date of Patent: August 13, 1991Assignee: Xerox CorporationInventors: Guerino Sacripante, Lupu Alexandru
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Patent number: 5039584Abstract: 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: February 9, 1990Date of Patent: August 13, 1991Assignee: Xerox CorporationInventors: Peter G. Odell, Giuseppa Baranyi, Lupu Alexandru
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Patent number: 5034296Abstract: A layered photoresponsive imaging member comprised of a photogenerating layer, and in contact therewith a hole transporting layer comprised of fluorene charge transport polyesters of the following formulas: ##STR1## where A, B, Z are independently selected from a group of bifunctional groups; R is an alkyl or aryl group; Ar is an aryl or substituted aryl group; x and y are mole fractional numbers wherein x is greater than 0, and the sum of x and y is equal to 1.0; and n represents the number of repeating segments.Type: GrantFiled: April 3, 1989Date of Patent: July 23, 1991Assignee: Xerox CorporationInventors: Beng S. Ong, Giuseppa Baranyi, Lupu Alexandru
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Patent number: 5006170Abstract: Disclosed are hot melt ink compositions suitable for ink jet printing which comprise a colorant, a binder, and a propellant selected from the group consisting of hydrazine; cyclic amines; ureas; carboxylic acids; sulfonic acids; aldehydes; ketones; hydrocarbons; esters; phenols; amides; imides; halocarbons; urethanes; ethers; sulfones; sulfamides; sulfonamindes; phosphites; phosphonates; phosphates; alkyl sulfines; alkyl acetates; and sulfur dioxide.Type: GrantFiled: June 22, 1989Date of Patent: April 9, 1991Assignee: Xerox CorporationInventors: William M. Schwarz, Robert H. Marchessault, Lupu Alexandru, Bernard Henrissat
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Patent number: 4983482Abstract: A layered photoresponsive imaging member comprised of a photogenerating layer, and in contact therewith a hole transporting layer comprised of charge transport polyurethanes of the following formula, optionally doped with a charge transport compound, or optionally dispersed in an inert resinous binder: ##STR1## wherein A, B and Z are independently selected from the group of bifunctional linkages; R is an alkyl or aryl group; Ar is an aryl or substituted aryl group; x and y represent the mole fractional numbers of the polyurethane structural composition units, subject to the provision that x is greater than 0 and that the sum of x and y is equal to 1.0; and n represents the number of repeating segments.Type: GrantFiled: April 3, 1989Date of Patent: January 8, 1991Assignee: Xerox CorporationInventors: Beng S. Ong, Dasarao K. Murti, Lupu Alexandru
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Patent number: 4973539Abstract: A toner composition comprised of a crosslinked thermotropic liquid crystalline polymer, a branched liquid crystalline polymer, or mixtures thereof.Type: GrantFiled: February 27, 1989Date of Patent: November 27, 1990Assignee: Xerox CorporationInventors: Guerino Sacripante, T. Brian McAneney, Stephan Drappel, Sheau V. Kao, Lupu Alexandru
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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 -
Patent number: 4894309Abstract: A free radical suspension polymerization process for obtaining crosslinked styrene butadiene ternary copolymers which comprises the polymerization of styrene monomers, butadiene monomers, and crosslinking components in the presence of a surfactant, a stabilizer, and a first and second initiator; and wherein the aforementioned components are present in an aqueous phase; heating the resulting aqueous mixture at a temperature of from about 50.degree. C. to about 110.degree. C.; thereafter heating the mixture at a temperature of from about 110.degree. C. to about 150.degree. C.; followed by cooling and isolating the desired product.Type: GrantFiled: September 19, 1988Date of Patent: January 16, 1990Assignee: Xerox CorporationInventors: Michael K. Georges, Lupu Alexandru, William J. Dale, Paul D. Szabo, Robert A. Nelson
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Patent number: 4891293Abstract: Thermotropic liquid crystalline polymers represented by the formulas as illustrated in FIGS. 1 and 2 wherein m,n and o represent the number of monomer segments present; and x,y and z are independently selected form the group consisting of alkyl, substituted alkyl, alkylene, and substituted alkylene.Type: GrantFiled: October 3, 1988Date of Patent: January 2, 1990Assignee: Xerox CorporationInventors: Guerino Sacripante, Lupu Alexandru
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Patent number: 4778742Abstract: 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: GrantFiled: October 7, 1987Date of Patent: October 18, 1988Assignee: Xerox CorporationInventors: Beng S. Ong, Walter Mychajlowskij, Lupu Alexandru
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Patent number: 4774160Abstract: Disclosed is an improved toner composition comprised of pigment particles and amorphous ternary copolycarbonate resin particles of the formula ##STR1## wherein R is an aliphatic hydrocarbon, n is a number of from about 4 to about 8, x is a number of from about 0.8 to about 0.95, y is a number of from about 0.05 to about 2, z represents the degree of polymerization, Ar.sub.1 is an aromatic substituent, and Ar.sub.2 is an aromatic substituent.Type: GrantFiled: February 24, 1987Date of Patent: September 27, 1988Assignee: Xerox CorporationInventors: Hadi-Khan Mahabadi, Lupu Alexandru
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Patent number: 4770968Abstract: A branched polysiloxane styrene butadiene polymer of the following formula ##STR1## wherein m is a number of from about 2 to about 10; z is the number 3,4 or 5; n is a number of from about 10 to about 1,000; k, l and o are weight fraction numbers with k being from about 0.35 to about 0.95, l being from 0.1 to about 0.2, and o is from about 0.05 to about 0.5; R is an aromatic substituent, alkyl-CR"C(O)O, and alkylene-CR"C(O)O, wherein R" is hydrogen or an alkyl substituent, and R' is an alkyl substituent or a trialkylsilylether substituent.Type: GrantFiled: July 27, 1987Date of Patent: September 13, 1988Assignee: Xerox CorporationInventors: Michael K. Georges, Lupu Alexandru
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Patent number: 4766255Abstract: A process for the preparation of gem-bis(hydroxyaryl)alkanes which comprises the reaction of a ketone, a hydroxyarene and an alkylhalosilane.Type: GrantFiled: June 29, 1987Date of Patent: August 23, 1988Assignee: Xerox CorporationInventors: Beng S. Ong, Lupu Alexandru
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Patent number: 4558108Abstract: A process for forming a copolymer of styrene and butadiene is disclosed including providing an aqueous phase comprising an aqueous mixture comprising water, styrene monomer, butadiene monomer, a suspension stabilizing agent, and a chain propogating amount of one or more free radical polymerization initiators, the ratio of the styrene monomer and the butadiene monomer being between about 80:20 and about 95:5 by weight, the weight proportion of water to the combination of styrene monomer and butadiene monomer being between about 0.8:1 and about 2:1 and a vapor phase comprising an inert gas and butadiene monomer, heating the aqueous phase and the vapor phase to a temperature between about 50.degree. C. and about 130.degree. C.Type: GrantFiled: October 9, 1984Date of Patent: December 10, 1985Assignee: Xerox CorporationInventors: Lupu Alexandru, Peter G. Odell
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Patent number: 4543313Abstract: Disclosed are improved toner compositions comprised of resin particles selected from the group consisting of thermotropic liquid crystalline polycarbonates, copolycarbonates, polyurethanes, polyesters, and copolyesters, and pigment particles.Type: GrantFiled: August 2, 1984Date of Patent: September 24, 1985Assignee: Xerox CorporationInventors: Hadi-Khan Mahabadi, Lupu Alexandru