Patents by Inventor Rajesh Kelekar
Rajesh Kelekar 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: 11884058Abstract: An image formation device includes at least one frame portion supporting at least one emitter to emit airborne charges, at least one radiation element to emit radiation, and a fluid ejection device to deposit droplets of ink particles within a non-aqueous fluid carrier onto a substrate. Upon relative movement between the at least one frame portion and the substrate, the emitted airborne charges are to electrostatically fix, and the at least one radiation element is to emit radiation to cause at least further fixation of, the deposited particles relative to the substrate.Type: GrantFiled: October 29, 2019Date of Patent: January 30, 2024Assignee: Hewlett-Packard Development Company, L.P.Inventors: Rajesh Kelekar, Napoleon J. Leoni, Omer Gila
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Patent number: 11827015Abstract: A device comprising a supply, a first portion, a second portion, and a third portion. The supply is to supply a metallized, non-absorptive media along a travel path, which is electrically connectable to a ground element, the metallized media to carry a first polymer structure. The first portion along the travel path is to receive droplets of ink particles within a dielectric, non-aqueous carrier fluid on the first polymer structure on the media to form an image. The second portion is to apply an adhesion-promoting surface treatment, onto the ink particles and the first polymer structure, comprising UV ozone, plasma, or chemical additive. The third portion is to apply, via heat and pressure, a second polymer structure onto the ink particles and the first polymer structure to produce a media assembly.Type: GrantFiled: March 22, 2019Date of Patent: November 28, 2023Assignee: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20230142273Abstract: Described herein is a liquid electrophotographic ink composition comprising chargeable particles comprising a thermoplastic resin; and a carrier liquid produced from vegetable oil or animal fat, the carrier liquid comprising an aliphatic hydrocarbon, an ester of a fatty acid and a monoalcohol, or a mixture thereof. Also described herein is a process for producing the liquid electrophoto-graphic ink composition and a liquid electrophoto-graphic printing process.Type: ApplicationFiled: September 25, 2020Publication date: May 11, 2023Inventors: Rajesh Kelekar, Omer Gila
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Patent number: 11609515Abstract: A device includes a first portion and a first charge source. The first portion is located along a travel path of a substrate and is to receive ink particles within a carrier fluid in a pattern onto the substrate to at least partially form an image. The first charge source is downstream along the travel path from the first portion and is to emit first polarity charges to charge the at least first color ink particles to move, via electrostatic attraction through the first carrier fluid, to become electrostatically fixed in the pattern relative to the substrate. Via the first charge source or a subsequent charge source, further emission of opposite second polarity charges are to maintain electrostatic fixation of the ink particles in the pattern relative to the substrate.Type: GrantFiled: October 23, 2018Date of Patent: March 21, 2023Assignee: Hewlett-Packard Development Company, L.P.Inventors: Napoleon J. Leoni, Omer Gila, Rajesh Kelekar
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Patent number: 11604395Abstract: An airborne-charge receiving layer of a passive electronic paper assembly comprises a first side and opposite second side to be in contact with a charge-responsive media layer. The airborne-charge receiving layer comprises a first material to minimize triboelectric charge transfer at an external surface of the first side of the airborne-charge receiving layer.Type: GrantFiled: December 14, 2017Date of Patent: March 14, 2023Assignee: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20220371339Abstract: An image formation device includes at least one frame portion supporting at least one emitter to emit airborne charges, at least one radiation element to emit radiation, and a fluid ejection device to deposit droplets of ink particles within a non-aqueous fluid carrier onto a substrate. Upon relative movement between the at least one frame portion and the substrate, the emitted airborne charges are to electrostatically fix, and the at least one radiation element is to emit radiation to cause at least further fixation of, the deposited particles relative to the substrate.Type: ApplicationFiled: October 29, 2019Publication date: November 24, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Rajesh Kelekar, Napoleon J. Leoni, Omer Gila
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Publication number: 20220371334Abstract: An image formation device includes a first portion and a second portion. The first portion along a travel path is to receive droplets of color ink particles within a dielectric carrier fluid onto a substrate to form an image. The second portion includes a charge source to emit airborne charges to charge the color ink particles to move, via attraction relative to the substrate, through the carrier fluid to become electrostatically fixed relative to the substrate and to become additionally fixed, in their electrostatically fixed position, via distance-dependent, molecular forces relative to the substrate. The duration of additional fixation via distance-dependent, molecular forces may be at least greater than a duration of the electrostatic fixation.Type: ApplicationFiled: September 12, 2018Publication date: November 24, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Omer Gila, Rajesh Kelekar, Napoleon J Leoni
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Publication number: 20220355602Abstract: An image formation device includes a mixer, a fluid ejection device, and a liquid removal element. The mixer is to receive a first ink mixture of ink particles within a first non-aqueous liquid carrier in a first concentration, to receive a second non-aqueous liquid carrier, and to form a second ink mixture of the ink particles within both the first and second liquid carriers in a second concentration less than the first concentration. The fluid ejection device is to receive the second ink mixture and to deposit droplets of the second ink mixture onto a substrate to at least partially form an image via the ink particles. The liquid removal element is to remove the respective liquid carriers from the substrate to provide at least a portion of the second liquid carrier at the mixer to form part of the second ink mixture.Type: ApplicationFiled: October 29, 2019Publication date: November 10, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Omer Gila, Napoleon J. Leoni, Rajesh Kelekar, Dekel Green
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Publication number: 20220348777Abstract: An ink includes a dielectric, non-aqueous carrier fluid. The ink also includes pigment particles within the carrier fluid and liquid resin in a dispersed phase encapsulating each of the pigment particles within the carrier fluid. The liquid resin is to be polymerized after the ink is applied to a substrate.Type: ApplicationFiled: July 2, 2019Publication date: November 3, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20220350284Abstract: A scanning carriage of a printer includes a first emitter to emit first airborne charges, a second emitter to emit second airborne charges, and a fluid ejection device interposed between the first and second emitters to deposit droplets of ink particles within a non-aqueous fluid carrier onto a print medium to form an image. The carriage is movable relative to the print medium in a first direction and an opposite second direction. In the first direction, the first emitter is to electrostatically discharge the medium and the second emitter is to induce electrostatic fixation of the ink particles relative to the medium. In the opposite second direction, the second emitter is to electrostatically discharge the medium and the first emitter is to induce electrostatic fixation of the ink particles relative to the medium.Type: ApplicationFiled: October 15, 2019Publication date: November 3, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventors: Napoleon Leoni, Omer Gila, Rajesh Kelekar
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Patent number: 11391976Abstract: An e-paper assembly includes a charge-responsive, re-writable media layer and an airborne-charge receiving layer disposed on the first side of the media layer. A moisture vapor barrier is interposed between the airborne-charge receiving layer and a first side of the charge-responsive media layer, with the moisture vapor barrier including an inorganic material.Type: GrantFiled: June 13, 2017Date of Patent: July 19, 2022Assignee: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20220119654Abstract: An emulsion ink includes a carrier fluid, pigment particles, and a liquid resin. The carrier fluid is a dielectric, non-aqueous carrier fluid. The pigment particles are within the carrier fluid. The liquid resin is in a dispersed phase within the carrier fluid. The liquid resin is to be polymerized after the ink is applied to a substrate.Type: ApplicationFiled: July 2, 2019Publication date: April 21, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20220024205Abstract: A device comprising a supply, a first portion, a second portion, and a third portion. The supply is to supply a metallized, non-absorptive media along a travel path, which is electrically connectable to a ground element, the metallized media to carry a first polymer structure. The first portion along the travel path is to receive droplets of ink particles within a dielectric, non-aqueous carrier fluid on the first polymer structure on the media to form an image. The second portion is to apply an adhesion-promoting surface treatment, onto the ink particles and the first polymer structure, comprising UV ozone, plasma, or chemical additive. The third portion is to apply, via heat and pressure, a second polymer structure onto the ink particles and the first polymer structure to produce a media assembly.Type: ApplicationFiled: March 22, 2019Publication date: January 27, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20220024222Abstract: A device includes an image formation medium supply, a first portion, and a second portion. The image formation medium supply is to supply a non-absorptive, image formation medium along a travel path and to which a ground element is to be electrically connected. The first portion along the travel path is to receive droplets of ink particles and a non-aqueous resin within a dielectric, non-aqueous carrier fluid on the image formation medium to form at least a portion of an image on the image formation medium. The second portion is downstream from the first portion and is to apply, via heat and pressure, a second polymer structure onto the ink particles, the resin, and the image formation medium to produce an image formation medium assembly.Type: ApplicationFiled: March 18, 2019Publication date: January 27, 2022Applicant: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20210247707Abstract: A device includes an at least partially electrically conductive transfer member to travel along a travel path and a first portion along the travel path to receive an image-receiving holder onto the transfer member. A second portion is downstream from the first portion along the travel path to receive ink particles onto the image-receiving holder to form an image, while a transfer station is to transfer the ink particles and the image-receiving holder together from the transfer member to an image formation medium. A discharge element, which is interposed between the transfer station and the first portion, is to cause discharge of the transfer member.Type: ApplicationFiled: October 29, 2018Publication date: August 12, 2021Applicant: Hewlett-Packard Development Company, L.P.Inventors: Rajesh Kelekar, Napoleon J. Leoni, Omer Gila
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Publication number: 20210240111Abstract: A device includes a first portion and a first charge source. The first portion is located along a travel path of a substrate and is to receive ink particles within a carrier fluid in a pattern onto the substrate to at least partially form an image. The first charge source is downstream along the travel path from the first portion and is to emit first polarity charges to charge the at least first color ink particles to move, via electrostatic attraction through the first carrier fluid, to become electrostatically fixed in the pattern relative to the substrate. Via the first charge source or a subsequent charge source, further emission of opposite second polarity charges are to maintain electrostatic fixation of the ink particles in the pattern relative to the substrate.Type: ApplicationFiled: October 23, 2018Publication date: August 5, 2021Applicant: Hewlett-Packard Development Company, L.P.Inventors: Napoleon J. Leoni, Omer Gila, Rajesh Kelekar
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Publication number: 20210200055Abstract: A passive e-paper assembly includes a charge-transmissible moisture vapor barrier comprising a flexible inorganic material, a charge-responsive, re-writable media layer, and a first adhesion-promoting layer interposed between the moisture vapor barrier and a first side of the charge-responsive media layer.Type: ApplicationFiled: August 23, 2018Publication date: July 1, 2021Applicant: Hewlett-Packard Development Company, L.P.Inventor: Rajesh KELEKAR
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Publication number: 20210181567Abstract: An e-paper assembly includes a charge-responsive, re-writable media layer and an airborne-charge receiving layer disposed on the first side of the media layer. A moisture vapor barrier is interposed between the airborne-charge receiving layer and a first side of the charge-responsive media layer, with the moisture vapor barrier including an inorganic material.Type: ApplicationFiled: June 13, 2017Publication date: June 17, 2021Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventor: Rajesh KELEKAR
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Publication number: 20200301237Abstract: An airborne-charge receiving layer of a passive electronic paper assembly comprises a first side and opposite second side to be in contact with a charge-responsive media layer. The airborne-charge receiving layer comprises a first material to minimize triboelectric charge transfer at an external surface of the first side of the airborne-charge receiving layer.Type: ApplicationFiled: December 14, 2017Publication date: September 24, 2020Applicant: Hewlett-Packard Development Company, L.P.Inventor: Rajesh Kelekar
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Publication number: 20160118309Abstract: Embodiments provided herein describe systems and methods for processing substrates. A substrate having a first region and a second region is provided. A container is positioned proximate to the first region of the substrate. The container has an opening on an end thereof adjacent to the substrate. A processing liquid is dispensed into the container such that the processing liquid contacts the first region of the substrate through the opening. The gaseous pressure in a portion of the container devoid of the processing liquid is reduced. The reduction of the gaseous pressure prevents the processing liquid from flowing from the first region of the substrate to the second region of the substrate.Type: ApplicationFiled: October 28, 2014Publication date: April 28, 2016Inventors: Rajesh Kelekar, Satbir Kahlon, Robert Sculac