Patents by Inventor Chakkaravarthy Chidambareswarapattar
Chakkaravarthy Chidambareswarapattar 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: 20210206940Abstract: Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties.Type: ApplicationFiled: September 25, 2020Publication date: July 8, 2021Applicant: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Patent number: 10822466Abstract: Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties.Type: GrantFiled: December 14, 2018Date of Patent: November 3, 2020Assignee: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Publication number: 20200239319Abstract: Porous three-dimensional networks of polyimide and porous three-dimensional networks of carbon and methods of their manufacture are described. For example, polyimide aerogels are prepared by mixing a dianhydride and a diisocyanate in a solvent comprising a pyrrolidone and acetonitrile at room temperature to form a sol-gel material and supercritically drying the sol-gel material to form the polyimide aerogel. Porous three-dimensional polyimide networks, such as polyimide aerogels, may also exhibit a fibrous morphology. Having a porous three-dimensional polyimide network undergo an additional step of pyrolysis may result in the three dimensional network being converted to a purely carbon skeleton, yielding a porous three-dimensional carbon network. The carbon network, having been derived from a fibrous polyimide network, may also exhibit a fibrous morphology.Type: ApplicationFiled: September 6, 2019Publication date: July 30, 2020Applicant: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Publication number: 20190359787Abstract: Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties.Type: ApplicationFiled: December 14, 2018Publication date: November 28, 2019Applicant: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Patent number: 10442693Abstract: Porous three-dimensional networks of polyimide and porous three-dimensional networks of carbon and methods of their manufacture are described. For example, polyimide aerogels are prepared by mixing a dianhydride and a diisocyanate in a solvent comprising a pyrrolidone and acetonitrile at room temperature to form a sol-gel material and supercritically drying the sol-gel material to form the polyimide aerogel. Porous three-dimensional polyimide networks, such as polyimide aerogels, may also exhibit a fibrous morphology. Having a porous three-dimensional polyimide network undergo an additional step of pyrolysis may result in the three dimensional network being converted to a purely carbon skeleton, yielding a porous three-dimensional carbon network. The carbon network, having been derived from a fibrous polyimide network, may also exhibit a fibrous morphology.Type: GrantFiled: July 19, 2017Date of Patent: October 15, 2019Assignee: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Publication number: 20180251623Abstract: Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties.Type: ApplicationFiled: October 6, 2017Publication date: September 6, 2018Applicant: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Publication number: 20180162736Abstract: Porous three-dimensional networks of polyimide and porous three-dimensional networks of carbon and methods of their manufacture are described. For example, polyimide aerogels are prepared by mixing a dianhydride and a diisocyanate in a solvent comprising a pyrrolidone and acetonitrile at room temperature to form a sol-gel material and supercritically drying the sol-gel material to form the polyimide aerogel. Porous three-dimensional polyimide networks, such as polyimide aerogels, may also exhibit a fibrous morphology. Having a porous three-dimensional polyimide network undergo an additional step of pyrolysis may result in the three dimensional network being converted to a purely carbon skeleton, yielding a porous three-dimensional carbon network. The carbon network, having been derived from a fibrous polyimide network, may also exhibit a fibrous morphology.Type: ApplicationFiled: July 19, 2017Publication date: June 14, 2018Applicant: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Patent number: 9809694Abstract: Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties.Type: GrantFiled: November 26, 2014Date of Patent: November 7, 2017Assignee: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Patent number: 9745198Abstract: Porous three-dimensional networks of polyimide and porous three-dimensional networks of carbon and methods of their manufacture are described. For example, polyimide aerogels are prepared by mixing a dianhydride and a diisocyanate in a solvent comprising a pyrrolidone and acetonitrile at room temperature to form a sol-gel material and supercritically drying the sol-gel material to form the polyimide aerogel. Porous three-dimensional polyimide networks, such as polyimide aerogels, may also exhibit a fibrous morphology. Having a porous three-dimensional polyimide network undergo an additional step of pyrolysis may result in the three dimensional network being converted to a purely carbon skeleton, yielding a porous three-dimensional carbon network. The carbon network, having been derived from a fibrous polyimide network, may also exhibit a fibrous morphology.Type: GrantFiled: April 24, 2014Date of Patent: August 29, 2017Assignee: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Patent number: 9233533Abstract: An inkjet printhead includes a front face having a polymer coating, the polymer coating including an oleophobic grafted polymer having a crosslinked fluoroelastomer and a perfluorinated polyether grafted to the crosslinked fluoroelastomer.Type: GrantFiled: September 4, 2013Date of Patent: January 12, 2016Assignee: XEROX CORPORATIONInventors: Mandakini Kanungo, Matthew M. Kelly, Varun Sambhy, David J. Gervasi, Santokh S. Badesha, Chakkaravarthy Chidambareswarapattar, Michael S. Roetker
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Patent number: 9206269Abstract: An oleophobic grafted polymer includes a crosslinked fluoroelastomer and a perfluorinated polyether grafted to the crosslinked fluoroelastomer. A process for making an oleophobic grafted polymer includes crosslinking a fluoroelastomer with an aminofunctionalized silane and grafting an alkoxysilane-terminated perfluorinated polyether to the crosslinked fluoroelastomer.Type: GrantFiled: September 4, 2013Date of Patent: December 8, 2015Assignee: XEROX CORPORATIONInventors: Mandakini Kanungo, Matthew M. Kelly, Varun Sambhy, David J. Gervasi, Santokh S. Badesha, Chakkaravarthy Chidambareswarapattar, Michael S. Roetker
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Patent number: 9187587Abstract: A marking system surface material includes a fluoroelastomer including grafted fluorinated polymers. The fluoroelastomer is a perfluoropolyether-grafted fluoroelastomer formed using an alkoxy-terminated fluorosilicone component, and exhibiting high contact angle and low sliding angle.Type: GrantFiled: June 30, 2013Date of Patent: November 17, 2015Assignee: Xerox CorporationInventors: Mandakini Kanungo, Chakkaravarthy Chidambareswarapattar, David J. Gervasi, Santokh S. Badesha, Matthew M. Kelly, Akshat Sharma
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Publication number: 20150267026Abstract: Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties.Type: ApplicationFiled: November 26, 2014Publication date: September 24, 2015Applicant: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Patent number: 8927079Abstract: Nanoporous three-dimensional networks of polyurethane particles, e.g., polyurethane aerogels, and methods of preparation are presented herein. Such nanoporous networks may include polyurethane particles made up of linked polyisocyanate and polyol monomers. In some cases, greater than about 95% of the linkages between the polyisocyanate monomers and the polyol monomers are urethane linkages. To prepare such networks, a mixture including polyisocyanate monomers (e.g., diisocyanates, triisocyanates), polyol monomers (diols, triols), and a solvent is provided. The polyisocyanate and polyol monomers may be aliphatic or aromatic. A polyurethane catalyst is added to the mixture causing formation of linkages between the polyisocyanate monomers and the polyol monomers. Phase separation of particles from the reaction medium can be controlled to enable formation of polyurethane networks with desirable nanomorphologies, specific surface area, and mechanical properties.Type: GrantFiled: November 28, 2012Date of Patent: January 6, 2015Inventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Publication number: 20150005454Abstract: An oleophobic grafted polymer includes a crosslinked fluoroelastomer and a perfluorinated polyether grafted to the crosslinked fluoroelastomer. A process for making an oleophobic grafted polymer includes crosslinking a fluoroelastomer with an aminofunctionalized silane and grafting an alkoxysilane-terminated perfluorinated polyether to the crosslinked fluoroelastomer.Type: ApplicationFiled: September 4, 2013Publication date: January 1, 2015Applicant: XEROX CORPORATIONInventors: Mandakini Kanungo, Matthew M. Kelly, Varun Sambhy, David J. Gervasi, Santokh S. Badesha, Chakkaravarthy Chidambareswarapattar, Michael S. Roetker
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Publication number: 20150002592Abstract: A marking system surface material includes a fluoroelastomer including grafted fluorinated polymers. The fluoroelastomer is a perfluoropolyether-grafted fluoroelastomer formed using an alkoxy-terminated fluorosilicone component, and exhibiting high contact angle and low sliding angle.Type: ApplicationFiled: June 30, 2013Publication date: January 1, 2015Applicant: XEROX CORPORATIONInventors: Mandakini KANUNGO, Chakkaravarthy CHIDAMBARESWARAPATTAR, David J. GERVASI, Santokh S. BADESHA, Matthew M. KELLY, Akshat SHARMA
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Publication number: 20150002581Abstract: An inkjet printhead includes a front face having a polymer coating, the polymer coating including an oleophobic grafted polymer having a crosslinked fluoroelastomer and a perfluorinated polyether grafted to the crosslinked fluoroelastomer.Type: ApplicationFiled: September 4, 2013Publication date: January 1, 2015Applicant: XEROX CORPORATIONInventors: Mandakini Kanungo, Matthew M. Kelly, Varun Sambhy, David J. Gervasi, Santokh S. Badesha, Chakkaravarthy Chidambareswarapattar, Michael S. Roetker
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Patent number: 8877824Abstract: The present disclosure provides a series of new and improved porous polyamide aerogels derived from multifunctional aromatics that combine the high mechanical strength of aramids with the pore structure of aerogels. The polyamide aerogels have a hyperbranched structure, relatively low density, high porosity and are derived from functionalized monomers having more aromatic groups than functional groups. The present disclosure also provides a new method for producing the porous polyamide aerogels by polymerizing an aromatic multifunctional carboxylic acid with an isocyanate at moderate reaction condition followed by drying with liquid CO2.Type: GrantFiled: June 4, 2013Date of Patent: November 4, 2014Inventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Publication number: 20140322122Abstract: Porous three-dimensional networks of polyimide and porous three-dimensional networks of carbon and methods of their manufacture are described. For example, polyimide aerogels are prepared by mixing a dianhydride and a diisocyanate in a solvent comprising a pyrrolidone and acetonitrile at room temperature to form a sol-gel material and supercritically drying the sol-gel material to form the polyimide aerogel. Porous three-dimensional polyimide networks, such as polyimide aerogels, may also exhibit a fibrous morphology. Having a porous three-dimensional polyimide network undergo an additional step of pyrolysis may result in the three dimensional network being converted to a purely carbon skeleton, yielding a porous three-dimensional carbon network. The carbon network, having been derived from a fibrous polyimide network, may also exhibit a fibrous morphology.Type: ApplicationFiled: April 24, 2014Publication date: October 30, 2014Applicant: Aerogel Technologies, LLCInventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar
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Publication number: 20130338247Abstract: The present disclosure provides a series of new and improved porous polyamide aerogels derived from multifunctional aromatics that combine the high mechanical strength of aramids with the pore structure of aerogels. The polyamide aerogels have a hyperbranched structure, relatively low density, high porosity and are derived from functionalized monomers having more aromatic groups than functional groups. The present disclosure also provides a new method for producing the porous polyamide aerogels by polymerizing an aromatic multifunctional carboxylic acid with an isocyanate at moderate reaction condition followed by drying with liquid CO2.Type: ApplicationFiled: June 4, 2013Publication date: December 19, 2013Inventors: Nicholas Leventis, Chariklia Sotiriou-Leventis, Chakkaravarthy Chidambareswarapattar