Patents by Inventor Varun Sambhy

Varun Sambhy 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).

  • Publication number: 20210016590
    Abstract: An imaging blanket for variable data lithography. The imaging blanket comprises a substrate. A foam layer is disposed on the substrate. An elastomeric layer is disposed on the foam layer, the elastomeric layer comprising a silicone elastomer. The elastomeric layer has a Shore A hardness ranging from about 50 Shore A to about 100 Shore A.
    Type: Application
    Filed: July 18, 2019
    Publication date: January 21, 2021
    Applicant: XEROX CORPORATION
    Inventors: Varun Sambhy, Kyle B. Tallman, Lin Ma, Santokh S. Badesha, Michael S. Roetker
  • Publication number: 20200353770
    Abstract: The present disclosure is directed to a multilayer imaging blanket for a variable data lithography printing system, including: a multilayer base having a lower contacting surface configured to wrap around or to be mounted on a cylinder core of the variable data lithography printing system; and a platinum catalyzed fluorosilicone surface layer opposite the lower contacting surface; wherein the multilayer base is a sulfur-free carcass including: a top layer including a sulfur-free rubber substrate such as an ethylene propylene diene monomer (EPDM) rubber substrate, a bottom layer including the lower contacting surface; and a compressible layer disposed between the top layer and the bottom layer, the compressible layer being attached to a surface of the top layer opposite the platinum catalyzed fluorosilicone surface layer and a surface of the bottom layer opposite the lower contacting surface, optionally the top layer further comprises a reinforcing fabric layer, the reinforcing fabric layer attached to a surfa
    Type: Application
    Filed: May 7, 2019
    Publication date: November 12, 2020
    Applicant: XEROX CORPORATION
    Inventors: Varun Sambhy, Lin Ma, Kyle B. Tallman, Santokh S. Badesha, Michael S. Roetker, Mark C. Petropoulos, Jack T. LeStrange, Joseph C. Sheflin, Peter J. Knausdorf, Jorge A. Alvarez
  • Publication number: 20200307293
    Abstract: Provided herein is an imaging blanket for variable data lithography comprising (i) a substrate and (ii) a thermally-conductive composition disposed on the substrate comprising a silicone elastomer and a thermally-conductive filler selected from metal oxides, wherein the thermally-conductive composition has a thermal conductivity ranging from about 0.6 W/m2 to about 1.6 W/m2. Further provided herein a method of making the imaging blanket, as well as a printing system comprising the imaging blanket, wherein the imaging blanket has improved thermal conductivity.
    Type: Application
    Filed: March 28, 2019
    Publication date: October 1, 2020
    Applicant: XEROX CORPORATION
    Inventors: Varun Sambhy, Joseph Sheflin, Peter Knausdorf, Mark C. Petropoulos, Jack T. LeStrange, Santokh S. Badesha
  • Publication number: 20200282759
    Abstract: An imaging blanket comprises a base comprising an elastic polymer and sulfur. A barrier layer is on the base and a surface layer is on the barrier layer. The surface layer comprises an elastomer and a platinum catalyst.
    Type: Application
    Filed: March 7, 2019
    Publication date: September 10, 2020
    Applicant: XEROX CORPORATION
    Inventors: Varun Sambhy, Gary D. Redding, Santokh S. Badesha, Peter J. Nystrom, Lina Bian
  • Patent number: 10705442
    Abstract: The present disclosure relates to toner compositions containing a high loading of white colorant of greater than 30 weight % by weight of the toner and processes thereof. The toner exhibits a lightness (L*) of at least 75.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: July 7, 2020
    Assignee: XEROX CORPORATION
    Inventors: Karen A. Moffat, David J. W. Lawton, Melanie L. Davis, Juan A. Morales-Tirado, Varun Sambhy
  • Publication number: 20190322114
    Abstract: The present teachings include a transfer member, a multilayer imaging blanket and a variable data lithography system. The transfer member includes a fluorosilicone surface layer. The surface layer includes mixing a first part and a second part. The first part includes a vinyl terminated trifluoropropyl methylsiloxane, an IR absorbing filler, silica and a first solvent. The second part includes an organo platinum complex having vinyl groups, a methyl hydrosiloxanetrifluoropropyl methyl siloxane having hydrosilane groups an inhibitor and a second solvent. The molar ratio of vinyl groups to hydrosilane groups is 0.7:1.0 to about 1.3:1.0 in the mixture. The mixture of the first part and second is coated on a substrate to form the fluorosilicone surface layer.
    Type: Application
    Filed: April 23, 2018
    Publication date: October 24, 2019
    Inventors: Varun Sambhy, Amy C. Porter, Lin Ma, Kyle B. Tallman, Santokh S. Badesha, Michael S. Roetker
  • Publication number: 20190317438
    Abstract: Disclosed herein is a release fluid, a fuser member and an image forming apparatus. The release fluid is a blend an amino functional silicone fluid and a non-functional silicone fluid. The amount of the amino functional silicone fluid is from about 10 weight percent to about 90 weight percent of the release fluid. The amount of the non-functional silicone fluid is from about 10 weight percent to about 90 weight percent of the release fluid. The amount of silanol (Si—OH) is less than 200 ppm in the release fluid.
    Type: Application
    Filed: April 13, 2018
    Publication date: October 17, 2019
    Inventors: Varun Sambhy, Santokh S. Badesha, Alexander N. Klymachyov, David S. Derleth, Mark A. Arnould, John R. Lambie, James E. Quigley
  • Publication number: 20190317421
    Abstract: 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: Application
    Filed: April 13, 2018
    Publication date: October 17, 2019
    Inventors: Varun Sambhy, Alexander N. Klymachyov, Padam K. Angra, Santokh S. Badesha, Jacob W. Myers, II, Dennis A. Mattison, JR.
  • Publication number: 20190316001
    Abstract: Disclosed herein is a release fluid, a fuser member and an image forming apparatus. The release fluid includes an amino functional fluid and a hindered amine stabilizer. The hindered amine stabilizer has the following structure: wherein q is an integer between 1 and 100.
    Type: Application
    Filed: April 13, 2018
    Publication date: October 17, 2019
    Inventors: Varun Sambhy, Santokh S. Badesha, Alexander N. Klymachyov, David S. Derleth, Mark A. Arnould, John R. Lambie
  • Patent number: 10350828
    Abstract: 3-D printing transfers build material and support from an intermediate transfer belt (ITB) to a platen. The build material is the same as the support material, except that the build material includes a photoinitiator and the support material does not. The platen moves to make contact with the ITB, and the ITB transfers successive layers of build material and support material each time the platen contacts the ITB. The platen and a portion of the ITB that is adjacent the platen are heated prior to the platen contacting the ITB, and the same is exposed so as to crosslink polymers of build material, without crosslinking polymers of support material. The polymers of build material being crosslinked and the polymers of support material not being crosslinked makes the support material selectively soluble in a solvent.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: July 16, 2019
    Assignee: Xerox Corporation
    Inventors: John S. Facci, David C. Craig, David S. Derleth, Eliud Robles Flores, Varun Sambhy
  • Publication number: 20190113859
    Abstract: A carrier including a carrier core; and a coating thereover; wherein the coating comprises a polymer having a low molecular weight of from about 100,000 to about 300,000 g/mole and a particle size of from about 0.05 to about 0.6 micrometer. A developer including a toner; and a carrier; wherein the carrier comprises a carrier core; and a coating thereover; wherein the coating comprises a polymer having a low molecular weight of from about 100,000 to about 300,000 g/mole and a particle size of from about 0.05 to about 0.6 micrometer. A process for preparing a carrier including providing a carrier core; and disposing a polymer coating thereover by combining the carrier core and the polymer coating in a mixing device; optionally, fusing the coating to the carrier core; wherein the coating comprises a polymer having a low molecular weight of from about 100,000 to about 300,000 g/mole and a particle size of from about 0.05 to about 0.6 micrometer.
    Type: Application
    Filed: October 17, 2017
    Publication date: April 18, 2019
    Inventors: Elizabeth K. Priebe, Brian S. Giannetto, Varun Sambhy, Brian E. Moore, Thomas C. Dombroski, Juan A. Morales-Tirado
  • Patent number: 10214662
    Abstract: There is described a printing method, an image apparatus and a print. A release fluid is provided for use in the printing method, imaging apparatus and print. The release fluid is a blend an amino functional silicone fluid and a non-functional silicone fluid. The amount of the amino functional silicone fluid is from about 10 weight percent to about 90 weight percent of the release fluid. The amount of the non-functional silicone fluid is from about 10 weight percent to about 90 weight percent of the release fluid. The amount of silanol (Si—OH) is less than 200 ppm in the release fluid.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: February 26, 2019
    Assignee: Xerox Corporation
    Inventors: Varun Sambhy, Santokh S. Badesha, Alexander N. Klymachyov, David S. Derleth, John R. Lambie
  • Patent number: 10201930
    Abstract: 3-D printers include a transfuse station having at least one roller on one side of an ITB supporting the ITB, and a transmission device on the same side of the ITB. A charge neutralizer is included on a second side of the intermediate transfer surface. The charge neutralizer outputs an opposite charge to neutralize existing static charge on a layer of the build material and the support material on the ITB, before the layer reaches the transfer station. Additionally, the intermediate transfer surface transfers the layer to a platen each time the platen contacts the second side of the intermediate transfer surface, at the transfer station, to successively form layers of the build material and the support material on the platen. Also, the transmission device outputs acoustic waves to cause the layer to move from the intermediate transfer surface to the platen, or to the layers on the platen.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: February 12, 2019
    Assignee: Xerox Corporation
    Inventors: Eliud Robles Flores, David S. Derleth, David C. Craig, John S. Facci, Varun Sambhy
  • Patent number: 10175598
    Abstract: A release agent material including a blend of a nonfunctional siloxane release agent fluid and at least two different organo-functional siloxane release agent materials having amino-functional groups or alkyl functional groups, useful in machines having gamut extension capability.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: January 8, 2019
    Assignee: Xerox Corporation
    Inventors: Varun Sambhy, David S Derleth, Juan A Morales-Tirado, Santokh S Badesha
  • Publication number: 20180370135
    Abstract: 3-D printing transfers build material and support from an intermediate transfer belt (ITB) to a platen. The build material is the same as the support material, except that the build material includes a photoinitiator and the support material does not. The platen moves to make contact with the ITB, and the ITB transfers successive layers of build material and support material each time the platen contacts the ITB. The platen and a portion of the ITB that is adjacent the platen are heated prior to the platen contacting the ITB, and the same is exposed so as to crosslink polymers of build material, without crosslinking polymers of support material. The polymers of build material being crosslinked and the polymers of support material not being crosslinked makes the support material selectively soluble in a solvent.
    Type: Application
    Filed: August 9, 2018
    Publication date: December 27, 2018
    Applicant: Xerox Corporation
    Inventors: John S. Facci, David C. Craig, David S. Derleth, Eliud Robles Flores, Varun Sambhy
  • Patent number: 10126672
    Abstract: A charge control agent-silicone oil composition includes a silicone oil and a charge control agent, the charge control agent being covalently linked to the silicone oil or is homogenously dispersed in the silicone oil as a dispersion. A method includes reacting an electrophilically-activated silicone oil with a charge control agent, thereby covalently linking the charge control agent to the silicone oil to provide a charge control agent-functionalized silicone oil. A bio-based toner includes a resin blend that includes a petroleum based resin and a bio-based resin, a charge control agent-silicone oil, a colorant, and a silica and/or titania additive, the toner having a bio-content of greater than about 25% by weight and does not exhibit moisture sensitivity.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: November 13, 2018
    Assignees: XEROX CORPORATION, CLARKSON UNIVERSITY
    Inventors: Varun Sambhy, Juan A. Morales-Tirado, Santokh S. Badesha, Richard E. Partch
  • Patent number: 10099421
    Abstract: 3-D printing transfers build material and support from an intermediate transfer belt (ITB) to a platen. The build material is the same as the support material, except that the build material includes a photoinitiator and the support material does not. The platen moves to make contact with the ITB, and the ITB transfers successive layers of build material and support material each time the platen contacts the ITB. The platen and a portion of the ITB that is adjacent the platen are heated prior to the platen contacting the ITB, and the same is exposed so as to crosslink polymers of build material, without crosslinking polymers of support material. The polymers of build material being crosslinked and the polymers of support material not being crosslinked makes the support material selectively soluble in a solvent.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: October 16, 2018
    Assignee: Xerox Corporation
    Inventors: John S. Facci, David C. Craig, David S. Derleth, Eliud Robles Flores, Varun Sambhy
  • Patent number: 10005227
    Abstract: A 3-D printer includes a development station positioned to electrostatically transfer layers of material to an intermediate transfer surface, and a transfuse station adjacent the intermediate transfer surface. The transfuse station is positioned to receive the layers as the intermediate transfer surface moves past the transfuse station. Also, a platen is included that moves relative to the intermediate transfer surface. The intermediate transfer surface transfers a layer of the material to the platen each time the platen contacts one of the layers on the intermediate transfer surface at the transfuse station to successively form a freestanding stack of the layers on the platen. A curing station is positioned to apply ultraviolet light to each layer, after each layer is transferred from the transfuse station to the platen. The curing station selectively applies the ultraviolet light to crosslink polymers only in a portion of the material within the layer.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: June 26, 2018
    Assignee: Xerox Corporation
    Inventors: John S. Facci, David C. Craig, Varun Sambhy, Eliud Robles Flores, David S. Derleth
  • Publication number: 20180173128
    Abstract: The present disclosure relates to toner compositions containing a high loading of white colorant of greater than 30 weight % by weight of the toner and processes thereof. The toner exhibits a lightness (L*) of at least 75.
    Type: Application
    Filed: February 1, 2018
    Publication date: June 21, 2018
    Inventors: Karen A. Moffat, David J.W. Lawton, Melanie L. Davis, Juan A. Morales-Tirado, Varun Sambhy
  • Patent number: RE47920
    Abstract: A support material toner particle for use in xerographic additive manufacturing includes a PVA polymer blend including a polyvinyl alcohol (PVA) polymer and blend-additives including a chitosan and a polyvinylpyrrolidone (PVP), the amount of blend-additives is selected to adjust the Tg of the PVA polymer blend to be within about 1° C. to about 20° C. of a desired build material toner Tg. A xerographic toner system includes a build toner material and a support toner material, the support toner material includes a PVA polymer blend including a polyvinyl alcohol (PVA) polymer and blend-additives including a chitosan and a polyvinylpyrrolidone (PVP), the amount of blend-additives is selected to adjust the Tg of the PVA polymer blend to be within about 1° C. to about 20° C. of the build material toner Tg. A method of making a support toner material includes blending polyvinyl alcohol with blend additives including a chitosan and polyvinylpyrrolidone and forming support toner particles after the blending step.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: March 31, 2020
    Assignee: XEROX CORPORATION
    Inventors: Varun Sambhy, John S. Facci, Eliud Robles-Flores, David S. Derleth, David C. Craig