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: 20230095967
    Abstract: A process including providing a paper substrate; disposing a water soluble precoat composition onto all or a portion of the paper substrate to provide a treated paper; applying an image onto the treated paper using a toner or an aqueous ink to provide an imaged paper; wherein the water soluble precoat composition forms a temporary barrier between the toner or aqueous ink and the paper substrate; and wherein, during a paper pulping process, the water soluble precoat composition dissolves thereby releasing the toner or aqueous ink from the paper substrate.
    Type: Application
    Filed: September 16, 2021
    Publication date: March 30, 2023
    Inventors: Varun Sambhy, Eliud Robles Flores, Douglas A. Gutberlet, Paul F. Sawicki
  • Patent number: 11613116
    Abstract: A method of operating a printer distributes inkjet operations from frequently used inkjets to lesser used inkjets. The redistribution of the inkjet operations helps reduce the number of inkjets exhibiting cross-process direction error so printhead maintenance operations, such as purging, occur less frequently.
    Type: Grant
    Filed: October 1, 2021
    Date of Patent: March 28, 2023
    Assignee: Xerox Corporation
    Inventors: Jason M. LeFevre, Douglas K. Herrmann, Chu-Heng Liu, Varun Sambhy, Seemit Praharaj
  • Patent number: 11604424
    Abstract: A development system includes a housing configured for accommodating a developer material which includes toner particles. At least one magnetic roller is positioned within the housing to attract the developer material to a surface of the magnetic roller(s). A continuous developer belt is positioned to attract the toner particles from the at least one magnetic roller to a surface of the developer belt. The developer belt is carried on a plurality of developer rollers. One of the developer rollers is positioned adjacent to an image transfer member, such as a belt or drum, with a photoconductive surface. Some of the toner particles are transferred to a latent image formed on the image transfer member to generate a toner image layer, which is applied to a sheet of print medium.
    Type: Grant
    Filed: February 9, 2022
    Date of Patent: March 14, 2023
    Assignee: XEROX CORPORATION
    Inventors: Douglas A Gutberlet, Eliud Robles Flores, Paul F Sawicki, Varun Sambhy
  • Publication number: 20220402286
    Abstract: Disclosed herein is a substrate cooling unit for use with a duplex aqueous ink jet image forming device. The substrate cooling unit includes a first transport belt that is in contact with a portion of an outer surface of the first cooling roll to substantially sandwich individual sheets of image receiving media between a first cooling roll and the first transport belt. The substrate cooling unit includes a second cooling roll positioned downstream of the first cooling roll in a process direction and a second transport belt that is in contact with a portion of an outer surface of the second cooling roll to substantially sandwich the individual sheets of image receiving media between the second cooling roll and the second transport belt. The second transport belt includes a bottom layer of woven or non-woven fibers and a top rubber layer.
    Type: Application
    Filed: June 21, 2021
    Publication date: December 22, 2022
    Inventors: John Patrick Baker, Varun Sambhy, Santokh S. Badesha, David Scott Derleth, Piotr Sokolowski
  • Patent number: 11528386
    Abstract: A method of operating a printer separates the image data content of a sheet in a print job into multiple color separations. The first color separation printed on the sheet includes at least two fiducials printed in the least perceptible color of ink in the printer. The at least two fiducials are used to identify the process direction and skew of the printed sheet before the remaining color separations are printed on the sheet with the first color separation.
    Type: Grant
    Filed: August 30, 2021
    Date of Patent: December 13, 2022
    Assignee: Xerox Corporation
    Inventors: Douglas K. Herrmann, Seemit Praharaj, Chu-Heng Liu, Jason M. LeFevre, Varun Sambhy
  • Publication number: 20220388063
    Abstract: A three-dimensional (3D) metal object manufacturing apparatus has a plurality of thermally insulative members that float in a volume of heat transfer lubricating fluid in which a X-Y translation mechanism moves to position a platform opposite an ejector. The apparatus also includes a housing having an internal volume in which the platform and X-Y translation mechanism are located. The heat transfer lubricating fluid can be a molten salt, such as a molten fluoride, chloride, or nitrate molten salt. The thermally insulative members can be spheres made of zirconium oxide or zirconium dioxide. The thermally insulative layer formed by the members floating in the fluid protects the X-Y mechanism while the housing helps keep the surface temperature of the object being formed on the platform in an optimal range for bonding of melted metal drops ejected from the ejector to a surface of a metal object being formed on the platform.
    Type: Application
    Filed: June 5, 2021
    Publication date: December 8, 2022
    Inventors: Douglas K. Herrmann, Varun Sambhy
  • Patent number: 11498354
    Abstract: A multilayer imaging blanket for a variable data lithography system, including a multilayer base including a sulfur-containing layer; and a cured topcoat layer including a polyurethane in contact with the sulfur-containing layer of the multilayer base.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: November 15, 2022
    Assignee: XEROX CORPORATION
    Inventors: Varun Sambhy, Peter J. Knausdorf, Ngoc-Tram Le, Santokh S. Badesha, Jack T. LeStrange
  • Publication number: 20220240387
    Abstract: A three-dimensional (3D) metal object manufacturing apparatus selects operational parameters for operation of the printer to form vias in substrates. The apparatus identifies the bulk metal being melted for ejection and uses this identification data to select the operational parameters. The apparatus identifies the via holes in the substrate and positions an ejector opposite the via holes to eject drops of melted bulk metal toward the via holes to fill the via holes.
    Type: Application
    Filed: January 22, 2021
    Publication date: July 28, 2022
    Inventors: Denis Cormier, Santokh S. Badesha, Varun Sambhy
  • Publication number: 20220228030
    Abstract: Provided herein is a topcoat composition comprising at least one fluorosilicone, a hydride-functional crosslinking agent, an infrared-absorbing filler, and at least one dispersant that is non-reactive with the hydride-functional crosslinking agent, by weight based on a total weight of the topcoat composition, wherein the topcoat composition has a degree of crosslinking between about 10 micrograms/hour/milligrams to about 20 micrograms/hour/milligrams. Further provided herein are methods of making the topcoat composition, as well as an imaging blanket and methods of reducing coating defects on a media coated using the imaging member.
    Type: Application
    Filed: January 19, 2021
    Publication date: July 21, 2022
    Applicant: XEROX CORPORATION
    Inventors: Kenny-Tuan T. Dinh, Alexander N. Klymachyov, Lin Ma, Kyle B. Tallman, Eric Robert Dudek, Michael L. Mehan, Harry F. Freitas, JR., Angela Schnuerch, Michael S. Roetker, Ngoc-Tram Le, Varun Sambhy, Santokh S. Badesha
  • Publication number: 20220219381
    Abstract: A three-dimensional (3D) printer includes an ejector and a coil wrapped at least partially around the ejector. The 3D printer also includes a power source configured to transmit voltage pulses to the coil. The 3D printer includes a computing system causing one or more drops of the liquid to be jetted out of the nozzle, and a vibrational source configured to transmit vibrational energy towards the printing material. The frequency of the vibrational energy may be dynamically modulated as a 3D object is formed by the 3D printer, and may be directly or indirectly applied to the printing material or 3D object. The vibrational source may include a piezoelectric source, ultrasonic source, a focused acoustic energy source, a laser vibrational source, or combinations thereof.
    Type: Application
    Filed: January 8, 2021
    Publication date: July 14, 2022
    Applicant: XEROX CORPORATION
    Inventors: Denis Cormier, Santokh S. Badesha, Varun Sambhy
  • Publication number: 20220212257
    Abstract: A three-dimensional (3D) metal object manufacturing apparatus has a volume of thermally insulative fluid in which a X-Y translation mechanism moves to position a platform opposite an ejector head. The apparatus also includes a housing having an internal volume in which the platform and X-Y translation mechanism are located. The thermally insulative fluid is a molten salt, such as a molten fluoride, chloride, or nitrate molten salt. The thermally insulative layer protects the X-Y mechanism while the housing helps keep the surface temperature of the object being formed on the platform in an optimal range for bonding of melted metal drops ejected from the ejector head to a surface of a metal object being formed on the platform.
    Type: Application
    Filed: January 7, 2021
    Publication date: July 7, 2022
    Inventors: Douglas K. Herrmann, Varun Sambhy
  • Publication number: 20220212265
    Abstract: A three-dimensional (3D) object printer has an ejector head with a single nozzle that is fluidly connected to a plurality of orifices in an orifice plate of the ejector head. An ejection of material through the single nozzle is emitted through the plurality of orifices simultaneously. In one embodiment, some of the orifices are oriented at an angle to a normal to the plane of the orifice plate. A splicer of the printer that generates machine ready instructions for operation of the printer identifies a standoff distance between the orifice plate and a surface onto which drops are being ejected to achieve a target drop spacing for the drops ejected onto the surface. In this manner, a material density for structure within a layer can be achieved without needing to increase the ejection frequency significantly or requiring the printer to incorporate multiple ejector heads.
    Type: Application
    Filed: January 4, 2021
    Publication date: July 7, 2022
    Inventors: Denis Cormier, Santokh S. Badesha, Varun Sambhy
  • Publication number: 20220212249
    Abstract: A three-dimensional (3D) printer includes an ejector and a coil wrapped at least partially around the ejector. The 3D printer also includes a power source configured to transmit voltage pulses to the coil. The 3D printer includes a computing system causing one or more drops of the liquid to be jetted out of the nozzle, and a substrate configured to support the one or more drops and advance along a path defined by one or more arcuate contours, where the one or more arcuate contours define a first layer of a strut. One or more struts are printed from the first layer of the strut to a node of each strut. The one or more struts are printed from a first layer to a node and combine to fabricate a lattice structure including one or more vertical struts and/or one or more angled struts wherein each strut intersects with another strut at a node.
    Type: Application
    Filed: January 6, 2021
    Publication date: July 7, 2022
    Applicant: XEROX CORPORATION
    Inventors: Denis Cormier, Dinesh Krishna Kumar Jayabal, Daniel Cormier, Santokh S. Badesha, Varun Sambhy
  • Publication number: 20220168817
    Abstract: A three-dimensional (3D) printer includes an ejector having a nozzle. The 3D printer also includes a heating element configured to heat a solid metal in the ejector, thereby causing the solid metal to change to a liquid metal within the ejector. The 3D printer also includes a coil wrapped at least partially around the ejector. The 3D printer also includes a power source configured to supply one or more pulses of power to the coil, which cause one or more drops of the liquid metal to be jetted out of the nozzle. The 3D printer also includes a substrate configured to support the one or more drops as the one or more drops solidify to form a 3D object. The 3D printer also includes a gas source configured to cause an oxygen concentration to be less than about 5% proximate to the one or more drops, the 3D object, or both.
    Type: Application
    Filed: December 2, 2020
    Publication date: June 2, 2022
    Applicant: XEROX CORPORATION
    Inventors: Varun Sambhy, George Shannon, Santokh S. Badesha
  • Patent number: 11298964
    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: Grant
    Filed: March 28, 2019
    Date of Patent: April 12, 2022
    Assignee: XEROX CORPORATION
    Inventors: Varun Sambhy, Joseph Sheflin, Peter Knausdorf, Mark C. Petropoulos, Jack T. LeStrange, Santokh S. Badesha
  • Publication number: 20220063317
    Abstract: A multilayer imaging blanket for a variable data lithography system, including a multilayer base including a sulfur-containing layer; and a cured topcoat layer including a polyurethane in contact with the sulfur-containing layer of the multilayer base.
    Type: Application
    Filed: August 26, 2020
    Publication date: March 3, 2022
    Applicant: XEROX CORPORATION
    Inventors: Varun Sambhy, Peter J. Knausdorf, Ngoc-Tram Le, Santokh S. Badesha, Jack T. LeStrange
  • Publication number: 20220049123
    Abstract: Provided herein is a topcoat composition comprising at least one fluorosilicone, at least one infrared-absorbing filler, and silicone dioxide present in an amount ranging from greater than about 5% to about 10%, by weight based on a total weight of the topcoat composition, wherein when the topcoat composition has a shear rate between about 2 s?1 to about 3 s?1, the topcoat composition has a viscosity ranging from about 1500 mPa/s to about 500 mPa/s and the shear rate does not decrease as the viscosity increases or decreases. Further provided herein are methods of making the topcoat composition, as well as an imaging blanket and methods of reducing coating defects on a media coated using the imaging member.
    Type: Application
    Filed: August 12, 2020
    Publication date: February 17, 2022
    Applicant: XEROX CORPORATION
    Inventors: Kenny-Tuan T. Dinh, Kyle B. Tallman, Lin Ma, Alexander N. Klymachyov, Angela Schnuerch, Michael L. Mehan, Eric Robert Dudek, Lanhui Zhang, Varun Sambhy, Michael S. Roetker, Santokh S. Badesha
  • Patent number: 11230135
    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: Grant
    Filed: May 7, 2019
    Date of Patent: January 25, 2022
    Assignee: 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: 20210069972
    Abstract: Nozzles for an additive manufacturing device and methods for improving wettability of the nozzles are disclosed. The method may include subjecting the nozzle to a surface treatment. The surface treatment may include contacting a surface of the nozzle with one or more surface modifying agents. The surface modifying agents may include one or more of an oxidizing agent, an acid, a base, or combinations thereof. The one or more surface modifying agents may increase an oxygen content of the surface of the nozzle. An inner surface of the nozzle may have a water contact angle of greater than 1° and less than about 90°. The inner surface of the nozzle may be free or substantially free of a coating.
    Type: Application
    Filed: September 10, 2020
    Publication date: March 11, 2021
    Applicant: XEROX CORPORATION
    Inventors: Santokh S. Badesha, Varun Sambhy, Chu-Heng Liu, Peter M. Gulvin, Mark A. Cellura, George Shannon, Gary D. Redding, Lyle G. Dingman
  • Patent number: 10928754
    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: Grant
    Filed: April 13, 2018
    Date of Patent: February 23, 2021
    Assignee: Xerox Corporation
    Inventors: Varun Sambhy, Santokh S. Badesha, Alexander N. Klymachyov, David S. Derleth, Mark A. Arnould, John R. Lambie, James E. Quigley