Patents by Inventor Padam K. Angra
Padam K. Angra 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: 20230333495Abstract: A white toner having toner particles including: a resin; a BaSO4 pigment; wherein a particle size is defined as Span=(Dn90?Dn10)/(Dn50); and wherein the BaSO4 pigment has a wide particle size distribution wherein the Span is 0.75 or greater; and an optional wax. A pulverized (conventional) toner and an emulsion aggregation toner process.Type: ApplicationFiled: April 18, 2022Publication date: October 19, 2023Inventors: Varun Sambhy, Santokh S. Badesha, Padam K. Angra
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Publication number: 20200308328Abstract: A polymeric composition including a copolymer comprising a first monomer having a high carbon to oxygen ratio of from about 3 to about 8; a second monomer comprising two or more vinyl groups, wherein the second monomer is present in the copolymer in an amount of from greater than about 8 percent by weight to about 60 percent by weight, based on the weight of the copolymer; and, optionally, a third monomer comprising an amine, wherein the third monomer, if present, is present in an amount of from about 0.5 percent by weight to about 5 percent by weight, based on the weight of the copolymer. A toner including the copolymer as a toner surface additive. An emulsion aggregation toner process including the copolymer as a toner surface additive.Type: ApplicationFiled: March 29, 2019Publication date: October 1, 2020Inventors: Richard P. N. Veregin, Padam K. Angra, Maria McCall Barden, Majid Kamel, Cuong Vong, Randy P. Tin, Mark A. Jackson, John J. Ianni
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Publication number: 20190317421Abstract: An emulsion aggregation (EA) toner particle for use in a xerographic apparatus having an oiled fusing system, the EA toner particle including a core including a resin, a branched ester wax having substantially no solubility in fuser oil, a coagulant, and an optional colorant. Such toners may be part of a toner composition and are useful in printing procedures such as image-on-image printing.Type: ApplicationFiled: April 13, 2018Publication date: October 17, 2019Inventors: Varun Sambhy, Alexander N. Klymachyov, Padam K. Angra, Santokh S. Badesha, Jacob W. Myers, II, Dennis A. Mattison, JR.
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Patent number: 9811017Abstract: A low melt toner includes a core having a core polystyrene-butyl acrylate resin, a crystalline polyester resin, a pigment present in an amount from about 7% to about 20% by weight of the low melt toner, and a paraffin wax; a ratio of the polystyrene-butyl acrylate resin to crystalline polyester resin is in a range from about 5:1 to about 7:1; and a shell disposed over the core including a shell polystyrene-butyl acrylate resin.Type: GrantFiled: February 26, 2016Date of Patent: November 7, 2017Assignee: XEROX CORPORATIONInventors: Christopher M. Wolfe, Padam K. Angra, Jacob W. Myers, II
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Publication number: 20170248858Abstract: A low melt toner includes a core having a core polystyrene-butyl acrylate resin, a crystalline polyester resin, a pigment present in an amount from about 7% to about 20% by weight of the low melt toner, and a paraffin wax; a ratio of the polystyrene-butyl acrylate resin to crystalline polyester resin is in a range from about 5:1 to about 7:1; and a shell disposed over the core including a shell polystyrene-butyl acrylate resin.Type: ApplicationFiled: February 26, 2016Publication date: August 31, 2017Inventors: Christopher M. Wolfe, Padam K. Angra, Jacob W. Myers, II
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Publication number: 20150220012Abstract: Hyperpigmented magenta toner, that is indistinguishable from standard and conventional magenta toner, contains PR122 and PR260 in a 56:44 weight ratio and can be used with reduced TMA as compared to conventional magenta toner.Type: ApplicationFiled: February 6, 2014Publication date: August 6, 2015Applicant: Xerox CorporationInventors: Padam K Angra, Samir Kumar, Christopher M Wolfe, Brendan H Williamson
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Publication number: 20140356775Abstract: The disclosure relates generally to toner additives, and in particular, toner additives that provide reduced impaction within a toner particle and improved adhesion to the toner particle. The toner additives include alumina nanotubes, and may be used with other non-conventional additives such as silica nanotubes and titania nanotubes.Type: ApplicationFiled: May 28, 2013Publication date: December 4, 2014Inventors: Richard P.N. Veregin, Padam K. Angra
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Patent number: 8889329Abstract: The disclosure relates generally to toner additives, and in particular, toner additives that provide reduced impaction within a toner particle and improved adhesion to the toner particle. The toner additives include alumina nanotubes, and may be used with other non-conventional additives such as silica nanotubes and titania nanotubes.Type: GrantFiled: May 28, 2013Date of Patent: November 18, 2014Assignee: Xerox CorporationInventors: Richard P. N. Veregin, Padam K. Angra
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Publication number: 20140272703Abstract: Core/shell toner particles are made to have a desired triboelectric charge through control of the glass transition temperature (Tg) of the shell polymer and/or the ratio of styrene and at least one monomer for forming the polymer of the shell. The polymer is introduced onto core particles to form a shell thereon via an aggregation process.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: XEROX CORPORATIONInventors: Padam K. ANGRA, Christopher M. WOLFE
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Publication number: 20140205942Abstract: The disclosure relates generally to toner additives, and in particular, toner additives that provide desired higher and stable toner charge. The toner additives comprise silica nanotubes in combination with or in place of the commonly used silica or titania particulate additives.Type: ApplicationFiled: January 18, 2013Publication date: July 24, 2014Applicant: XEROX CORPORATIONInventors: PADAM K. ANGRA, Richard P. Veregin
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Patent number: 8785096Abstract: The disclosure relates generally to toner additives, and in particular, toner additives that provide desired higher and stable toner charge. The toner additives comprise silica nanotubes in combination with or in place of the commonly used silica or titania particulate additives.Type: GrantFiled: January 18, 2013Date of Patent: July 22, 2014Assignee: Xerox CorporationInventors: Padam K. Angra, Richard P. Veregin
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Publication number: 20090142688Abstract: A dry powder carrier coating composition that may be used to coat carrier particles that imparts desired triboelectric charging characteristics and conductivity values to make the carrier particles more insulative. In embodiments, the coating composition includes a styrene acrylate copolymer.Type: ApplicationFiled: February 5, 2008Publication date: June 4, 2009Applicant: XEROX CORPORATIONInventors: Brian S. Giannetto, Christopher M. Pattison, Thomas C. Dombroski, Brian E. Moore, Thomas J. Budny, Padam K. Angra, Zhaoyi M. Masucci, Bernard A. Kelly
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Patent number: 7378211Abstract: A carrier composition having magnetite with a diameter of from about 80 microns to about 150 microns, and wherein the carrier has a conductivity of from about 10?8 to about 10?11 (ohms-cm)?1 and a carrier breakdown voltage of from about 20 to about 200 volts, and a developer composition with toner and this carrier composition, and also including a developer housing apparatus and an electrostatographic apparatus comprising the developer housing apparatus.Type: GrantFiled: August 15, 2005Date of Patent: May 27, 2008Assignee: Xerox CorporationInventors: Padam K. Angra, Michael L. Grande, Zhaoyi M. Masucci, Joseph H. Rowe, John S. Walters
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Patent number: 6850725Abstract: An apparatus comprised of a charging component, a development component, a transport component, a photoconductive component, and a fusing component, and wherein the development component contains a toner comprising at least one binder in an optional amount of from about 85 to about 99 percent by weight, at least one colorant in an optional amount of from about 0.5 to about 15 percent by weight, and calcium stearate in an optional amount of from about 0.05 to about 2 percent by weight and wherein following triboelectric contact with carrier particles, the toner has a charge Q measured in femtocoulombs per particle diameter D measured in microns (Q/D) of from about ?0.1 to about ?1 fC/?m with a variation during development of from about 0 to about 0.25 fC/?m and wherein the distribution is substantially unimodal and possesses a peak width of from about 0.1 fC/?m to about 0.Type: GrantFiled: June 18, 2004Date of Patent: February 1, 2005Assignee: Xerox CorporationInventors: Scott M. Silence, William H. Hollenbaugh, Jr., Thomas R. Pickering, Amy L. Stamp, Roger N. Ciccarelli, Denise R. Bayley, Samuel Kaplan, Alexander N. Klymachyov, John S. Walters, Padam K. Angra
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Patent number: 6824942Abstract: A toner comprised of resin, colorant and calcium stearate.Type: GrantFiled: September 27, 2002Date of Patent: November 30, 2004Assignee: Xerox CorporationInventors: Scott M. Silence, William H. Hollenbaugh, Jr., Thomas R. Pickering, Amy L. Stamp, Roger N. Ciccarelli, Denise R. Bayley, Samuel Kaplan, Alexander N. Klymachyov, John S. Walters, Padam K. Angra
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Publication number: 20040229144Abstract: An apparatus comprised of a charging component, a development component, a transport component, a photoconductive component, and a fusing component, and wherein the development component contains a toner comprising at least one binder in an optional amount of from about 85 to about 99 percent by weight, at least one colorant in an optional amount of from about 0.5 to about 15 percent by weight, and calcium stearate in an optional amount of from about 0.05 to about 2 percent by weight and wherein following triboelectric contact with carrier particles, the toner has a charge Q measured in femtocoulombs per particle diameter D measured in microns (Q/D) of from about −0.1 to about −1 fC/&mgr;m with a variation during development of from about 0 to about 0.25 fC/&mgr;m and wherein the distribution is substantially unimodal and possesses a peak width of from about 0.1 fC/&mgr;m to about 0.Type: ApplicationFiled: June 18, 2004Publication date: November 18, 2004Applicant: Xerox CorporationInventors: Scott M. Silence, William H. Hollenbaugh, Thomas R. Pickering, Amy L. Stamp, Roger N. Ciccarelli, Denise R. Bayley, Samuel Kaplan, Alexander N. Klymachyov, John S. Walters, Padam K. Angra
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Publication number: 20040063018Abstract: A toner comprised of resin, colorant and calcium stearate.Type: ApplicationFiled: September 27, 2002Publication date: April 1, 2004Applicant: Xerox CorporationInventors: Scott M. Silence, William H. Hollenbaugh, Thomas R. Pickering, Amy L. Stamp, Roger N. Ciccarelli, Denise R. Bayley, Samuel Kaplan, Alexander N. Klymachyov, John S. Walters, Padam K. Angra
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Patent number: 6248496Abstract: A replenisher material of toner particles and carrier particles, wherein a replenisher ratio of the toner particles to the carrier particles in the replenisher is determined as a function of at least one property of the developer and at least one operational property of an apparatus for developing an electrostatic latent image recorded on an image receiving member, and wherein the apparatus includes a housing defining a chamber having a supply of developer comprised of toner particles and carrier particles therein, a donor member spaced from the image receiving member and adapted to transport toner particles of the developer from the chamber to a development zone adjacent the image receiving member, at least one wire positioned in the development zone between the image receiving member and the donor member, a voltage supply for electrically biasing the at least one wire during a developing operation with a current to detach toner particles from the donor member, forming a cloud of toner particles in the develType: GrantFiled: March 7, 2000Date of Patent: June 19, 2001Assignee: Xerox CorporationInventors: Merrilee A. Galloway, Scott M. Silence, William H. Hollenbaugh, Jr., Amy L. Stamp, Padam K. Angra
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Patent number: 5304448Abstract: An encapsulated toner composition comprised of a core comprised of a polymer binder and pigment, encapsulated in a shell derived from the polycondensation of a polyisocyanate and amino acid with an amide or hydroxy functionality.Type: GrantFiled: June 15, 1992Date of Patent: April 19, 1994Assignee: Xerox CorporationInventors: Barkev Keoshkerian, Beng S. Ong, Padam K. Angra
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Patent number: 5147744Abstract: A colored magnetic encapsulated toner composition comprised of a core comprised of a polymer binder, magnetic metal particles, whitener, color pigment, dye or mixtures thereof, and which core is encapsulated in a polymeric shell, and wherein the toner surface comprises an optional conductive metal oxide, or metal oxides and an optional release additive, or additives.Type: GrantFiled: February 28, 1991Date of Patent: September 15, 1992Assignee: Xerox CorporationInventors: Guerino G. Sacripante, Richard P. N. Veregin, Beng S. Ong, Padam K. Angra