Patents by Inventor Ravisubhash Tangirala
Ravisubhash Tangirala 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: 11970646Abstract: Disclosed are nanostructures comprising Ag, In, Ga, and S and a shell comprising Ag, Ga and S, wherein the nanostructures have a peak wavelength emission of 480-545 nm and wherein at least about 80% of the emission is band-edge emission. Also disclosed are methods of making the nanostructures.Type: GrantFiled: June 18, 2020Date of Patent: April 30, 2024Assignee: SHOEI CHEMICAL INC.Inventors: Ashenafi Damtew Mamuye, Christopher Sunderland, Ilan Jen-La Plante, Chunming Wang, John J. Curley, Nahyoung Kim, Ravisubhash Tangirala
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Patent number: 11926776Abstract: Disclosed are films comprising Ag, In, Ga, and S (AIGS) nanostructures and at least one ligand bound to the nanostructures. In some embodiment, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm.Type: GrantFiled: June 22, 2022Date of Patent: March 12, 2024Assignee: SHOEI CHEMICAL INC.Inventors: Ravisubhash Tangirala, Jay Yamanaga, Wenzhou Guo, Christopher Sunderland, Ashenafi Damtew Mamuye, Chunming Wang, Eunhee Hwang, Nahyoung Kim
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Publication number: 20230155075Abstract: A light emitting device includes a first optical cavity bounded by cavity walls, a first light emitting diode located in the first optical cavity and configured to emit blue or ultraviolet radiation first incident photons, a first color conversion material located over the first light emitting diode and configured to absorb the first incident photons emitted by the light emitting diode and to generate first converted photons having a longer peak wavelength than a peak wavelength of the first incident photons, and a first color selector located over the first color conversion material and configured to absorb or reflect the first incident photons and to transmit the first converted photons.Type: ApplicationFiled: November 15, 2022Publication date: May 18, 2023Inventors: Jason HARTLOVE, Saket CHADDA, Ernest C. LEE, Brian KIM, Homer ANTONIADIS, Ravisubhash TANGIRALA, David OLMEIJER
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Publication number: 20230002672Abstract: Disclosed are films comprising Ag, In, Ga, and S (AIGS) nanostructures and at least one ligand bound to the nanostructures. In some embodiment, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm.Type: ApplicationFiled: June 22, 2022Publication date: January 5, 2023Applicant: Nanosys, Inc.Inventors: Ravisubhash TANGIRALA, Jay YAMANAGA, Wenzhou GUO, Christopher SUNDERLAND, Ashenafi Damtew MAMUYE, Chunming WANG, Eunhee HWANG, Nahyoung KIM
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Patent number: 11407940Abstract: Disclosed are films comprising Ag, In, Ga, and S (AIGS) nanostructures and at least one ligand bound to the nanostructures. In some embodiment, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm.Type: GrantFiled: February 3, 2021Date of Patent: August 9, 2022Assignee: Nanosys, Inc.Inventors: Ravisubhash Tangirala, Jay Yamanaga, Wenzhou Guo, Christopher Sunderland, Ashenafi Damtew Mamuye, Chunming Wang, Eunhee Hwang, Nahyoung Kim
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Publication number: 20220228057Abstract: Disclosed are nanostructures comprising Ag, In, Ga, and S and a shell comprising Ag, Ga and S, wherein the nanostructures have a peak wavelength emission of 480-545 nm and wherein at least about 80% of the emission is band-edge emission. Also disclosed are methods of making the nanostructures.Type: ApplicationFiled: June 18, 2020Publication date: July 21, 2022Applicant: NANOSYS, INC.Inventors: Ashenafi Damtew MAMUYE, Christopher SUNDERLAND, Ilan JEN-LA PLANTE, Chunming WANG, John J. CURLEY, Nahyoung KIM, Ravisubhash TANGIRALA
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Publication number: 20220195294Abstract: Disclosed are films comprising Ag, In, Ga, and S (AIGS) nanostructures and at least one ligand bound to the nanostructures. In some embodiment, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm.Type: ApplicationFiled: February 3, 2021Publication date: June 23, 2022Applicant: Nanosys, Inc.Inventors: Ravisubhash TANGIRALA, Jay YAMANAGA, Wenzhou GUO, Christopher SUNDERLAND, Ashenafi Damtew MAMUYE, Chunming WANG, Eunhee HWANG, Nahyoung KIM
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Patent number: 11360250Abstract: Disclosed are stable films comprising Ag, In, Ga, and S (AIGS) nanostructures, or more one metal alkoxides, one or more metal alkoxide hydrolysis products, one or more metal halides, one or more metal halide hydrolysis products, one or more organometallic compounds, or one or more organometallic hydrolysis products, or combinations thereof, and at least one ligand bound to the nanostructures. In some embodiments, the AIGS nanostructures have a photon conversion efficiency of greater than 32% and a peak wavelength emission of 480-545 nm. In some embodiments, the nanostructures have an emission spectrum with a FWHM of 24-38 nm. In some embodiments, the nanostructures have a photon conversion efficiency (PCE) of at least 30% after being stored for 24 hours under yellow light and air storage conditions.Type: GrantFiled: October 26, 2021Date of Patent: June 14, 2022Assignee: Nanosys, Inc.Inventors: Wenzhou Guo, Ravisubhash Tangirala, Chunming Wang, Charles Hotz, Alain Barron
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Publication number: 20220098475Abstract: The present invention provides nanostructure compositions and methods of producing nanostructure compositions. The nanostructure compositions comprise a population of nanostructures comprising polythiol ligands with pendant moieties. The polythiol ligand with pendant moieties increase the solubility of the nanostructures in solvents and resins. The present invention also provides nanostructure films comprising the nanostructure compositions and methods of making nanostructure films using the nanostructure compositions.Type: ApplicationFiled: September 28, 2021Publication date: March 31, 2022Inventors: David OLMEIJER, Ravisubhash TANGIRALA, Austin SMITH
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Patent number: 11267980Abstract: The present invention provides nanostructure compositions and methods of producing nanostructure compositions. The nanostructure compositions comprise a population of nanostructures comprising polyfunctional poly(alkylene oxide) ligands. The present invention also provides nanostructure films comprising the nanostructure compositions and methods of making nanostructure films using the nanostructure compositions.Type: GrantFiled: October 24, 2018Date of Patent: March 8, 2022Assignee: Nanosys, Inc.Inventors: Ravisubhash Tangirala, Austin Smith, Charles Hotz
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Patent number: 11041071Abstract: The present disclosure provides nanostructure compositions and methods of producing nanostructure compositions. The nanostructure compositions comprise at least one population of nanostructures, at least one poly(alkylene oxide) ligand bound to the surface of the nanostructures, and optionally at least one organic resin. The present disclosure also provides nanostructure films comprising a nanostructure layer and methods of making nanostructure films.Type: GrantFiled: August 16, 2018Date of Patent: June 22, 2021Assignee: Nanosys, Inc.Inventors: Ravisubhash Tangirala, Shihai Kan, Jay Yamanaga, Charles Hotz, Donald Zehnder
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Publication number: 20200347254Abstract: The present invention provides nanostructure compositions and methods of producing nanostructure compositions. The nanostructure compositions comprise a population of nanostructures comprising polyfunctional poly(alkylene oxide) ligands. The present invention also provides nanostructure films comprising the nanostructure compositions and methods of making nanostructure films using the nanostructure compositions.Type: ApplicationFiled: October 24, 2018Publication date: November 5, 2020Applicant: Nanosys, Inc.Inventors: Ravisubhash TANGIRALA, Austin SMITH, Charles HOTZ
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Publication number: 20190077954Abstract: The present disclosure provides nanostructure compositions and methods of producing nanostructure compositions. The nanostructure compositions comprise at least one population of nanostructures, at least one poly(alkylene oxide) ligand bound to the surface of the nanostructures, and optionally at least one organic resin. The present disclosure also provides nanostructure films comprising a nanostructure layer and methods of making nanostructure films.Type: ApplicationFiled: August 16, 2018Publication date: March 14, 2019Applicant: Nanosys, Inc.Inventors: Ravisubhash Tangirala, Shihai Kan, Jay Yamanaga, Charles Hotz, Donald Zehnder
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Patent number: 9341913Abstract: The embodiments described herein provide an electrochromic device. In an exemplary embodiment, the electrochromic device includes (1) a substrate and (2) a film supported by the substrate, where the film includes transparent conducting oxide (TCO) nanostructures. In a further embodiment, the electrochromic device further includes (a) an electrolyte, where the nanostructures are embedded in the electrolyte, resulting in an electrolyte, nanostructure mixture positioned above the substrate and (b) a counter electrode positioned above the mixture. In a further embodiment, the electrochromic device further includes a conductive coating deposited on the substrate between the substrate and the mixture. In a further embodiment, the electrochromic device further includes a second substrate positioned above the mixture.Type: GrantFiled: August 21, 2012Date of Patent: May 17, 2016Assignee: The Regents of the University of CaliforniaInventors: Delia Milliron, Ravisubhash Tangirala, Anna Llordes, Raffaella Buonsanti, Guillermo Garcia
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Patent number: 9287119Abstract: An embodiment of an inorganic nanocomposite includes a nanoparticle phase and a matrix phase. The nanoparticle phase includes nanoparticles that are arranged in a repeating structure. In an embodiment, the nanoparticles have a spherical or pseudo-spherical shape and are incompatible with hydrazine. In another embodiment, the nanoparticles have neither a spherical nor pseudo-spherical shape. The matrix phase lies between the nanoparticles of the nanoparticle phase. An embodiment of a method of making an inorganic nanocomposite of the present invention includes forming a nanoparticle superlattice on a substrate. The nanoparticle superlattice includes nanoparticles. Each nanoparticle has organic ligands attached to a surface of the nanoparticle. The organic ligands separate adjacent nanoparticles within the nanoparticle superlattice. The method also includes forming a solution that includes an inorganic precursor.Type: GrantFiled: April 13, 2012Date of Patent: March 15, 2016Assignee: The Regents of the University of CaliforniaInventors: Ravisubhash Tangirala, Delia J. Milliron, Anna Llordes
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Publication number: 20150109652Abstract: The embodiments described herein provide an electrochromic device. In an exemplary embodiment, the electrochromic device includes (1) a substrate and (2) a film supported by the substrate, where the film includes transparent conducting oxide (TCO) nanostructures. In a further embodiment, the electrochromic device further includes (a) an electrolyte, where the nanostructures are embedded in the electrolyte, resulting in an electrolyte, nanostructure mixture positioned above the substrate and (b) a counter electrode positioned above the mixture. In a further embodiment, the electrochromic device further includes a conductive coating deposited on the substrate between the substrate and the mixture. In a further embodiment, the electrochromic device further includes a second substrate positioned above the mixture.Type: ApplicationFiled: August 21, 2012Publication date: April 23, 2015Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIAInventors: Delia Milliron, Ravisubhash Tangirala, Anna Llordes, Raffaella Buonsanti, Guillermo Garcia
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Publication number: 20140322898Abstract: An embodiment of an inorganic nanocomposite includes a nanoparticle phase and a matrix phase. The nanoparticle phase includes nanoparticles that are arranged in a repeating structure. In an embodiment, the nanoparticles have a spherical or pseudo-spherical shape and are incompatible with hydrazine. In another embodiment, the nanoparticles have neither a spherical nor pseudo-spherical shape. The matrix phase lies between the nanoparticles of the nanoparticle phase. An embodiment of a method of making an inorganic nanocomposite of the present invention includes forming a nanoparticle superlattice on a substrate. The nanoparticle superlattice includes nanoparticles. Each nanoparticle has organic ligands attached to a surface of the nanoparticle. The organic ligands separate adjacent nanoparticles within the nanoparticle superlattice. The method also includes forming a solution that includes an inorganic precursor.Type: ApplicationFiled: April 24, 2014Publication date: October 30, 2014Inventors: Ravisubhash Tangirala, Delia J. Milliron, Anna Llordes
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Publication number: 20120273719Abstract: An embodiment of an inorganic nanocomposite includes a nanoparticle phase and a matrix phase. The nanoparticle phase includes nanoparticles that are arranged in a repeating structure. In an embodiment, the nanoparticles have a spherical or pseudo-spherical shape and are incompatible with hydrazine. In another embodiment, the nanoparticles have neither a spherical nor pseudo-spherical shape. The matrix phase lies between the nanoparticles of the nanoparticle phase. An embodiment of a method of making an inorganic nanocomposite of the present invention includes forming a nanoparticle superlattice on a substrate. The nanoparticle superlattice includes nanoparticles. Each nanoparticle has organic ligands attached to a surface of the nanoparticle. The organic ligands separate adjacent nanoparticles within the nanoparticle superlattice. The method also includes forming a solution that includes an inorganic precursor.Type: ApplicationFiled: April 13, 2012Publication date: November 1, 2012Applicant: The Regents of the University of CaliforniaInventors: Ravisubhash Tangirala, Delia J. Milliron, Anna Llordes