Patents by Inventor Palitha Wickramanayake
Palitha Wickramanayake 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: 20240118581Abstract: An electrokinetic device is configured as a dynamic lens cover and/or filter for an imaging assembly, e.g., of a mobile device, to selectively allow electromagnetic radiation to pass through a lens of the imaging assembly when the dynamic lens cover is in a first operating state or to prevent electromagnetic radiation from reaching the lens of the imaging assembly when the dynamic lens cover is in a second operating state. The electrokinetic device includes transparent first and second substrates, and a compaction trench surrounding the lens of the imaging assembly. The compaction trench stores pigment when the dynamic lens cover is in the first operating state. In the second operating state pigment is dispersed within a carrier fluid between the first and second substrates.Type: ApplicationFiled: May 29, 2023Publication date: April 11, 2024Inventors: James E. Abbott, Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Publication number: 20230322974Abstract: Embossing resins, methods of manufacturing such resins, and electrokinetic display system, which includes display cells containing such resins. The resins include a fluoropolymer in weight percentage 5%-60%, a difunctional diluent in weight percentage 0-30%, a monofunctional diluent in weight percentage 0-40%, a urethane diacrylate or functionalized nanoscale material, e.g., a functionalized urethane material, in weight percentage 5-50%, a photoinitiator in weight percentage 0.5-5%, and a surfactant in weight percentage less than 0.5%. The difunctional diluent may be Hexanediol Diacrylate, and the monofunctional diluent may be a monofunctional hydrocarbon. The resins are made by identifying a target index of refraction for a cured state thereof, and combining together, by weight percentage, the constituent components to produce the liquid state version of the embossing resin having a desired composite index of refraction.Type: ApplicationFiled: February 10, 2023Publication date: October 12, 2023Inventors: James E. Abbott, Jr., Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Patent number: 11693289Abstract: An electrokinetic device is configured as a dynamic lens cover and/or filter for an imaging assembly, e.g., of a mobile device, to selectively allow electromagnetic radiation to pass through a lens of the imaging assembly when the dynamic lens cover is in a first operating state or to prevent electromagnetic radiation from reaching the lens of the imaging assembly when the dynamic lens cover is in a second operating state. The electrokinetic device includes transparent first and second substrates, and a compaction trench surrounding the lens of the imaging assembly. The compaction trench stores pigment when the dynamic lens cover is in the first operating state. In the second operating state pigment is dispersed within a carrier fluid between the first and second substrates.Type: GrantFiled: September 11, 2022Date of Patent: July 4, 2023Inventors: James E. Abbott, Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Publication number: 20230110256Abstract: An electrokinetic device is configured as a dynamic lens cover and/or filter for an imaging assembly, e.g., of a mobile device, to selectively allow electromagnetic radiation to pass through a lens of the imaging assembly when the dynamic lens cover is in a first operating state or to prevent electromagnetic radiation from reaching the lens of the imaging assembly when the dynamic lens cover is in a second operating state. The electrokinetic device includes transparent first and second substrates, and a compaction trench surrounding the lens of the imaging assembly. The compaction trench stores pigment when the dynamic lens cover is in the first operating state. In the second operating state pigment is dispersed within a carrier fluid between the first and second substrates.Type: ApplicationFiled: September 11, 2022Publication date: April 13, 2023Inventors: James E. Abbott, Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Patent number: 11578150Abstract: Embossing resins, methods of manufacturing such resins, and electrokinetic display system, which includes display cells containing such resins. The resins include a fluoropolymer in weight percentage 5%-60%, a difunctional diluent in weight percentage 0-30%, a monofunctional diluent in weight percentage 0-40%, a urethane diacrylate or functionalized nanoscale material, e.g., a functionalized urethane material, in weight percentage 5-50%, a photoinitiator in weight percentage 0.5-5%, and a surfactant in weight percentage less than 0.5%. The difunctional diluent may be Hexanediol Diacrylate, and the monofunctional diluent may be a monofunctional hydrocarbon. The resins are made by identifying a target index of refraction for a cured state thereof, and combining together, by weight percentage, the constituent components to produce the liquid state version of the embossing resin having a desired composite index of refraction.Type: GrantFiled: October 11, 2021Date of Patent: February 14, 2023Inventors: James E. Abbott, Jr., Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Patent number: 11454855Abstract: An electrokinetic device is configured as a dynamic lens cover and/or filter for an imaging assembly, e.g., of a mobile device, to selectively allow electromagnetic radiation to pass through a lens of the imaging assembly when the dynamic lens cover is in a first operating state or to prevent electromagnetic radiation from reaching the lens of the imaging assembly when the dynamic lens cover is in a second operating state. The electrokinetic device includes transparent first and second substrates, and a compaction trench surrounding the lens of the imaging assembly. The compaction trench stores pigment when the dynamic lens cover is in the first operating state. In the second operating state pigment is dispersed within a carrier fluid between the first and second substrates.Type: GrantFiled: January 13, 2020Date of Patent: September 27, 2022Inventors: James E. Abbott, Jr., Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Publication number: 20220177617Abstract: Embossing resins, methods of manufacturing such resins, and electrokinetic display system, which includes display cells containing such resins. The resins include a fluoropolymer in weight percentage 5%-60%, a difunctional diluent in weight percentage 0-30%, a monofunctional diluent in weight percentage 0-40%, a urethane diacrylate or functionalized nanoscale material, e.g., a functionalized urethane material, in weight percentage 5-50%, a photoinitiator in weight percentage 0.5-5%, and a surfactant in weight percentage less than 0.5%. The difunctional diluent may be Hexanediol Diacrylate, and the monofunctional diluent may be a monofunctional hydrocarbon. The resins are made by identifying a target index of refraction for a cured state thereof, and combining together, by weight percentage, the constituent components to produce the liquid state version of the embossing resin having a desired composite index of refraction.Type: ApplicationFiled: October 11, 2021Publication date: June 9, 2022Inventors: James E. Abbott, Jr., Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Patent number: 11174328Abstract: Embossing resins, methods of manufacturing such resins, and electrokinetic display system, which includes display cells containing such resins. The resins include a fluoropolymer in weight percentage 5%-60%, a difunctional diluent in weight percentage 0-30%, a monofunctional diluent in weight percentage 0-40%, a urethane diacrylate or functionalized nanoscale material, e.g., a functionalized urethane material, in weight percentage 5-50%, a photoinitiator in weight percentage 0.5-5%, and a surfactant in weight percentage less than 0.5%. The difunctional diluent may be Hexanediol Diacrylate, and the monofunctional diluent may be a monofunctional hydrocarbon. The resins are made by identifying a target index of refraction for a cured state thereof, and combining together, by weight percentage, the constituent components to produce the liquid state version of the embossing resin having a desired composite index of refraction.Type: GrantFiled: January 28, 2019Date of Patent: November 16, 2021Assignee: Crown Electrokinetics Corp.Inventors: James E. Abbott, Jr., Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Publication number: 20200225552Abstract: An electrokinetic device is configured as a dynamic lens cover and/or filter for an imaging assembly, e.g., of a mobile device, to selectively allow electromagnetic radiation to pass through a lens of the imaging assembly when the dynamic lens cover is in a first operating state or to prevent electromagnetic radiation from reaching the lens of the imaging assembly when the dynamic lens cover is in a second operating state. The electrokinetic device includes transparent first and second substrates, and a compaction trench surrounding the lens of the imaging assembly. The compaction trench stores pigment when the dynamic lens cover is in the first operating state. In the second operating state pigment is dispersed within a carrier fluid between the first and second substrates.Type: ApplicationFiled: January 13, 2020Publication date: July 16, 2020Inventors: James E. Abbott, JR., Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Patent number: 10583660Abstract: A printhead device includes firing chambers, nozzles, and shipping fluid. The shipping fluid includes a shipping fluid density and a shipping fluid viscosity greater than a corresponding ink density and ink viscosity of an ink that will be ejected from the firing chambers and through the nozzles.Type: GrantFiled: January 31, 2019Date of Patent: March 10, 2020Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Curtis Voss, Palitha Wickramanayake
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Publication number: 20190256625Abstract: Embossing resins, methods of manufacturing such resins, and electrokinetic display system, which includes display cells containing such resins. The resins include a fluoropolymer in weight percentage 5%-60%, a difunctional diluent in weight percentage 0-30%, a monofunctional diluent in weight percentage 0-40%, a urethane diacrylate or functionalized nanoscale material, e.g., a functionalized urethane material, in weight percentage 5-50%, a photoinitiator in weight percentage 0.5-5%, and a surfactant in weight percentage less than 0.5%. The difunctional diluent may be Hexanediol Diacrylate, and the monofunctional diluent may be a monofunctional hydrocarbon. The resins are made by identifying a target index of refraction for a cured state thereof, and combining together, by weight percentage, the constituent components to produce the liquid state version of the embossing resin having a desired composite index of refraction.Type: ApplicationFiled: January 28, 2019Publication date: August 22, 2019Inventors: James E. Abbott, JR., Timothy Koch, Cassady Roop, Palitha Wickramanayake
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Publication number: 20190160823Abstract: A printhead device includes firing chambers, nozzles, and shipping fluid. The shipping fluid includes a shipping fluid density and a shipping fluid viscosity greater than a corresponding ink density and ink viscosity of an ink that will be ejected from the firing chambers and through the nozzles.Type: ApplicationFiled: January 31, 2019Publication date: May 30, 2019Inventors: Curtis Voss, Palitha Wickramanayake
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Patent number: 10195861Abstract: A printhead device includes firing chambers, nozzles, and shipping fluid. The shipping fluid includes a shipping fluid density and a shipping fluid viscosity greater than a corresponding ink density and ink viscosity of an ink that will be ejected from the firing chambers and through the nozzles.Type: GrantFiled: December 2, 2014Date of Patent: February 5, 2019Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Curtis Voss, Palitha Wickramanayake
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Publication number: 20180298213Abstract: The present disclosure is drawn to ink compositions including from 1 wt % to 8 wt % pigment load, and a polymer dispersant associated with pigment, the polymer dispersant having hydrophilic moieties and hydrophobic moieties, a molecular weight ranging from 5,000 Mw to 25,000 Mw, and an acid number from about 40 to about 180. The polymer dispersant to pigment weight ratio can be less than 0.33.Type: ApplicationFiled: January 22, 2016Publication date: October 18, 2018Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Jayprakash C. Bhatt, Palitha Wickramanayake
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Publication number: 20180194958Abstract: The present disclosure is drawn to ink compositions comprising from 1 wt % to 8 wt % of a colored pigment and a polymeric dispersant. The polymeric dispersant can be associated with the pigment and the weight ratio of the polymeric dispersant to pigment can be less than 0.33. The polymeric dispersant can have hydrophilic moieties and hydrophobic moieties and an acid number from about 40 to about 180. The ink composition can have an effective charge stabilization from about 0.3 to about 1.8 that is calculated based on a product of the acid number of the polymeric dispersant, the polymer dispersant to pigment weight ratio, and the pigment load in the ink.Type: ApplicationFiled: October 14, 2015Publication date: July 12, 2018Applicant: Hewlett-Packard Development Company, L.P.Inventors: Jayprakash C. Bhatt, Palitha Wickramanayake
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Publication number: 20170320328Abstract: A printhead device includes firing chambers, nozzles, and shipping fluid. The shipping fluid includes a shipping fluid density and a shipping fluid viscosity greater than a corresponding ink density and ink viscosity of an ink that will be ejected from the firing chambers and through the nozzles.Type: ApplicationFiled: December 2, 2014Publication date: November 9, 2017Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Curtis Voss, Palitha Wickramanayake
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Patent number: 9193884Abstract: An ink composition includes a colorant, a co-solvent, and an acid chosen from oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof. The ink composition further includes lithium and water. An anti-evaporative layer forms, during uncapped non-use, at an interface between air and the ink composition in an orifice of a nozzle, thereby reducing evaporation of the water from the ink composition.Type: GrantFiled: December 22, 2011Date of Patent: November 24, 2015Assignee: Hewlett-Packard Development Company, L.P.Inventors: Sundar Vasudevan, Richard J. McManus, Palitha Wickramanayake
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Patent number: 9187665Abstract: An ink composition for inkjet printing is disclosed herein. The ink composition includes a self-dispersed carbon black pigment with alkali metal counter ions, polyurethane, and an aqueous carrier. The aqueous carrier includes water, at least one water-soluble organic solvent, and at least one surfactant. In one embodiment, the aqueous carrier further includes an additive having a polar head group and a C8-C18 hydrocarbon tail.Type: GrantFiled: March 15, 2010Date of Patent: November 17, 2015Assignee: Hewlett-Packard Development Company, L.P.Inventors: Sundar Vasudevan, Richard J Mcmanus, Palitha Wickramanayake
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Publication number: 20140285593Abstract: An ink composition includes a colorant, a co-solvent, and an acid chosen from oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof. The ink composition further includes lithium and water. An anti-evaporative layer forms, during uncapped non-use, at an interface between air and the ink composition in an orifice of a nozzle, thereby reducing evaporation of the water from the ink composition.Type: ApplicationFiled: December 22, 2011Publication date: September 25, 2014Inventors: Sundar Vasudevan, Richard J. McManus, Palitha Wickramanayake
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Publication number: 20120329921Abstract: An ink composition for inkjet printing is disclosed herein. The ink composition includes a self-dispersed carbon black pigment with alkali metal counter ions, polyurethane, and an aqueous carrier. The aqueous carrier includes water, at least one water-soluble organic solvent, and at least one surfactant. In one embodiment, the aqueous carrier further includes an additive having a polar head group and a C8-C18 hydrocarbon tail.Type: ApplicationFiled: March 15, 2010Publication date: December 27, 2012Inventors: Sundar Vasudevan, Richard J Mcmanus, Palitha Wickramanayake