Patents by Inventor Bernard Grushkin
Bernard Grushkin 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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Publication number: 20030017406Abstract: An emulsion aggregation toner particularly adapted for use in hybrid scavengeless development includes toner particles of polymer binder, colorant and a surface additive package containing at least one additive negatively chargeable to a carrier and at least one additive positively chargeable to the carrier. The toner is able to exhibit high stable triboelectric charging ability, and substantially eliminates charge through and slow admix in a developer employing the toner.Type: ApplicationFiled: July 10, 2001Publication date: January 23, 2003Applicant: Xerox CorporationInventors: Edward J. Gutman, Bernard Grushkin, John G. Ruhland
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Patent number: 6503677Abstract: An emulsion aggregation toner particularly adapted for use in hybrid scavengeless development includes toner particles of polymer binder, colorant and a surface additive package containing at least one additive negatively chargeable to a carrier and at least one additive positively chargeable to the carrier. The toner is able to exhibit high stable triboelectric charging ability, and substantially eliminates charge through and slow admix in a developer employing the toner.Type: GrantFiled: July 10, 2001Date of Patent: January 7, 2003Assignee: Xerox CorporationInventors: Edward J. Gutman, Bernard Grushkin, John G. Ruhland
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Patent number: 6294306Abstract: Toners are described which include one or more copolymers combined with colorant particles or primary toner particles. Processes for preparing the toners are also disclosed.Type: GrantFiled: February 22, 2000Date of Patent: September 25, 2001Assignee: Xerox CorporationInventors: Grazyna E. Kmiecik-Lawrynowicz, Chieh-Min Cheng, Bernard Grushkin, Karen L. LaMora, Casimir Mytych
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Patent number: 6087059Abstract: A toner comprised of resin, colorant and a surface additive mixture comprised of two coated silicas, and a coated metal oxide.Type: GrantFiled: June 28, 1999Date of Patent: July 11, 2000Assignee: Xerox CorporationInventors: Michael J. Duggan, K. Derek Henderson, Amy L. Stamp, Scott M. Silence, William H. Hollenbaugh, Jr., Edward J. Gutman, Bernard Grushkin, John G. Ruhland
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Patent number: 5914209Abstract: The use of a mixture of hard and soft magnetites as well as a lubricating wax in the formulation of single component developers is disclosed. The mixture allows for sufficient high remenance for MICR applications without high levels of magnetite loadings that can adversely affect the toner rheological properties and at the same time reduce sorter image abrasion.Type: GrantFiled: May 20, 1991Date of Patent: June 22, 1999Assignee: Xerox CorporationInventor: Bernard Grushkin
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Patent number: 5866290Abstract: A toner composition comprised of a polyester resin with hydrophobic end groups, colorant, optional wax, optional charge additive, and optional surface additives.Type: GrantFiled: August 1, 1997Date of Patent: February 2, 1999Assignee: Xerox CorporationInventors: Guerino G. Sacripante, Robert D. Bayley, Carol A. Fox, Thomas R. Hoffend, Bernard Grushkin
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Patent number: 5698422Abstract: A toner composition comprised of a polyester resin with hydrophobic end groups, pigment, optional wax, optional charge additive, and optional surface additives.Type: GrantFiled: January 6, 1995Date of Patent: December 16, 1997Assignee: Xerox CorporationInventors: Guerino G. Sacripante, Robert D. Bayley, Carol A. Fox, Thomas R. Hoffend, Bernard Grushkin
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Patent number: 5627004Abstract: A process for the preparation of negatively charged toner comprising:(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, an ionic surfactant, and optionally a charge control agent;(ii) shearing said pigment dispersion with a latex or emulsion blend comprised of a resin of styrene-vinylidene chloride-acrylic acid, styrene-vinyl chloride-acrylic acid, styrene-chloroprene-acrylic acid, styrene-butylacrylate-vinylidene chloride-acrylic acid, styrene-butylacrylate-vinyl chloride-acrylic acid, styrene-butadiene-vinylidene chloride-acrylic acid, or styrene-isoprene-vinylidene chloride-acrylic acid, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant;(iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates with a narrow particle size distribution; and(iv) heating said bound aggregates above about the Tg of the resin.Type: GrantFiled: September 27, 1996Date of Patent: May 6, 1997Assignee: Xerox CorporationInventor: Bernard Grushkin
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Patent number: 5601960Abstract: A process comprising:(a) reactive melt mixing of a base resin with a chemical initiator and crosslinking of said base resin to enable a highly crosslinked precursor resin, said highly crosslinked precursor resin being substantially free of sol, and comprising uncrosslinked portions and crosslinked portions, said crosslinked portions comprised of high density crosslinked microgel particles; and(b) accomplishing dilution by melt mixing said highly crosslinked precursor resin of (a) with a base resin to form a partially crosslinked toner resin, said toner resin being substantially free of sol, and comprising linear uncrosslinked portions and crosslinked portions, said crosslinked portions comprised essentially of high density crosslinked microgel particles, wherein said microgel particles are present in an amount of from about 1 to about 45 percent by weight of said toner resin.Type: GrantFiled: November 13, 1995Date of Patent: February 11, 1997Assignee: Xerox CorporationInventors: Hadi K. Mahabadi, Enno E. Agur, T. Brian McAneney, Sheau V. Kao, Gerald R. Allison, Michael S. Hawkins, Bernard Grushkin, J. Stephen Kittelberger, Joo T. Chung, William H. Hollenbaugh, Jr.
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Patent number: 5536615Abstract: A process for the preparation of liquid developers comprising:(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, and an ionic surfactant;(ii) shearing said pigment dispersion with a latex or emulsion blend comprised of a nonionic surfactant, resin, and a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and optionally adding further anionic, or nonionic surfactant to stabilize the aggregates obtained in (iii);(iii) heating the above resulting sheared aqueous blend below about the glass transition temperature (Tg) of the resin to form toner size aggregates with a narrow particle size distribution;(iv) heating said bound aggregates above about the Tg of the resin to form toner size particles in an aqueous medium and which particles possess a narrow particle size distribution; and(v) separating from the aqueous medium toner particles of resin and pigment, and dispersing said toner particles in a carrier fluid.Type: GrantFiled: July 5, 1995Date of Patent: July 16, 1996Assignee: Xerox CorporationInventors: Michael A. Hopper, Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz, Peter G. Odell, Bernard Grushkin, George A. Gibson
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Patent number: 5500324Abstract: A process comprising:(a) reactive melt mixing of a base resin with a chemical initiator and crosslinking of said base resin to enable a highly crosslinked precursor resin, said highly crosslinked precursor resin being substantially free of sol, and comprising uncrosslinked portions and crosslinked portions, said crosslinked portions comprised of high density crosslinked microgel particles; and(b) accomplishing dilution by melt mixing said highly crosslinked precursor resin of (a) with a base resin to form a partially crosslinked toner resin, said toner resin being substantially free of sol, and comprising linear uncrosslinked portions and crosslinked portions, said crosslinked portions comprised essentially of high density crosslinked microgel particles, wherein said microgel particles are present in an amount of from about 1 to about 45 percent by weight of said toner resin.Type: GrantFiled: October 31, 1994Date of Patent: March 19, 1996Assignee: Xerox CorporationInventors: Hadi K. Mahabadi, Enno E. Agur, T. Brian McAneney, Sheau V. Kao, Gerald R. Allison, Michael S. Hawkins, Bernard Grushkin, J. Stephen Kittelberger, Joo T. Chung, William H. Hollenbaugh, Jr.
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Patent number: 5496676Abstract: A process comprising:(i) preparing a pigment dispersion comprised of pigment, ionic surfactant, and optional charge control agent;(ii) mixing at least two resins in the form of latexes, each latex comprising a resin, ionic and nonionic surfactants and optionally a charge control agent, and wherein the ionic surfactant has a countercharge to the ionic surfactant of (i) to obtain a latex blend;(iii) shearing said pigment dispersion with the latex blend of (ii) comprised of resins, counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant;(iv) heating the above sheared blends of (iii) below about the glass transition temperature (Tg) of the resin, to form electrostatically bound toner size aggregates with a narrow particle size distribution; and(v) subsequently adding further anionic surfactant solution to minimize further growth of the bound aggregates (vi);(vi) heating said bound aggregates above about the glass transition temperature Tg of the rType: GrantFiled: March 27, 1995Date of Patent: March 5, 1996Assignee: Xerox CorporationInventors: Melvin D. Croucher, Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz, Michael A. Hopper, Bernard Grushkin
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Patent number: 5486443Abstract: A toner comprised of resin particles, magnetite, carbon black, rhodamine charge additive, wax, and a surface mixture of silica, strontium titanate and polyvinylidene fluoride.Type: GrantFiled: October 31, 1994Date of Patent: January 23, 1996Assignee: Xerox CorporationInventors: Michael L. Grande, Bernard Grushkin, Eugene F. Young, Douglas A. Lundy, Joseph R. E. Matalevich
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Patent number: 5486444Abstract: A process for the preparation of a crosslinked polyester which comprises the reaction of a diol or a mixture of diols and a diacid, a mixture of diacids or their diesters and a polyhydric alcohol monomer to provide a polyhydroxy functional polyester resin precursor, and subsequently reacting said polyhydroxy functional polyester precursor resin with a dianhydride or diepoxy functional crosslinking component.Type: GrantFiled: August 29, 1994Date of Patent: January 23, 1996Assignee: Xerox CorporationInventors: Robert D. Bayley, Carol A. Fox, Thomas R. Hoffend, James R. Paxson, Bernard Grushkin
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Patent number: 5482805Abstract: A toner comprised of resin particles, magnetite, carbon black, rhodamine charge additive, wax, and a surface mixture of aluminum oxide, strontium titanate and polyvinylidene fluoride.Type: GrantFiled: October 31, 1994Date of Patent: January 9, 1996Assignee: Xerox CorporationInventors: Michael L. Grande, Bernard Grushkin, Eugene F. Young, Douglas A. Lundy, Joseph R. E. Matalevich
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Patent number: 5401602Abstract: Low fix temperature toner resins are fabricated by a reactive melt mixing process wherein polymer resins are cross-linked at high temperature and high shear. The resins are particularly suitable for high speed fusing, show excellent offset resistance and wide fusing latitude and superior vinyl offset properties.Type: GrantFiled: March 23, 1993Date of Patent: March 28, 1995Assignee: Xerox CorporationInventors: Hadi K. Mahabadi, Enno E. Agur, Gerald R. Allison, Michael S. Hawkins, Stephan Drappel, Maria N. V. McDougall, Bernard Grushkin, Thomas R. Hoffend, Angelo J. Barbetta
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Patent number: 5391452Abstract: A toner composition comprised of pigment, an optional charge enhancing additive and a side chain polymer comprised of a polyester present as a side chain on a polyalkylene of the following formula ##STR1## wherein m, n, and o represent the number of monomer segments present; R is independently selected from the group consisting of hydrogen and alkyl; R' is independently selected from the group consisting of arylene and alkylene; R" is independently selected from the group consisting of alkylene and oxyalkylene; and wherein m is from about 10 to about 1,000, n is from about 1 to about 1,000 and o is from about 10 to about 1,000.Type: GrantFiled: August 2, 1993Date of Patent: February 21, 1995Assignee: Xerox CorporationInventors: Guerino G. Sacripante, Bernard Grushkin, Stephan V. Drappel, Allan K. Chen
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Patent number: 5376494Abstract: Low fix temperature toner resins are fabricated by a reactive melt mixing process wherein polymer resins are cross-linked at high temperature and high shear. The resins are particularly suitable for high speed fusing, show excellent offset resistance and wide fusing latitude and superior vinyl offset properties.Type: GrantFiled: December 30, 1991Date of Patent: December 27, 1994Assignee: Xerox CorporationInventors: Hadi K. Mahabadi, Enno E. Agur, Gerald R. Allison, Michael S. Hawkins, Stephan Drappel, Maria N. V. McDougall, Bernard Grushkin, Thomas R. Hoffend, Angelo J. Barbetta
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Patent number: 5368970Abstract: A toner composition comprised of the reaction product of resin particles containing hydroxyl, or acid groups, and an alkylene-glycidyl methacrylate polymer; pigment particles, and a wax component.Type: GrantFiled: December 6, 1993Date of Patent: November 29, 1994Assignee: Xerox CorporationInventor: Bernard Grushkin
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Patent number: 5352556Abstract: A low melt toner resin with low minimum fix temperature and wide fusing latitude contains a linear portion and a cross-linked portion containing high density cross-linked microgel particles, but substantially no low density cross-linked polymer. The resin may be formed by reactive melt mixing.Type: GrantFiled: March 23, 1993Date of Patent: October 4, 1994Assignee: Xerox CorporationInventors: Hadi K. Mahabadi, Enno E. Agur, Gerald R. Allison, Michael S. Hawkins, Stephan Drappel, Maria N. V. McDougall, Bernard Grushkin, Thomas R. Hoffend, Angelo J. Barbetta