Patents by Inventor Ajit K. Roy
Ajit K. Roy 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: 20240029915Abstract: An electrically conductive, flexible, strain resilient product is produced by mixing metal coated carbon nanotube networks with a liquid polymeric resin to produce a liquid mixture, and the mixture is cured to produce the product. The networks may include welded junctions between nanotubes formed by depositing and melting metal nanoparticles on the nanotubes to form the metal coating. After the mixing step the liquid mixture may be deposited on a flexible substrate in the form of an electrical circuit. The mixing step may further include mixing the composite with a volatile solvent to produce a selected viscosity. Then, a three-dimensional printer may be used to print the product, such as an electrical circuit, on a substrate. The product is cured in an atmosphere that absorbs the solvent. The conductivity of the mixture may be adjusted by adjusting the weight percentage of the metal coated carbon nanotube networks from 50% to 90%, but a preferred range is between 75% and 85%.Type: ApplicationFiled: October 5, 2023Publication date: January 25, 2024Inventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
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Patent number: 11817232Abstract: An electrically conductive, flexible, strain resilient product is produced by mixing metal coated carbon nanotube networks with a liquid polymeric resin to produce a liquid mixture, and the mixture is cured to produce the product. The networks may include welded junctions between nanotubes formed by depositing and melting metal nanoparticles on the nanotubes to form the metal coating. After the mixing step the liquid mixture may be deposited on a flexible substrate in the form of an electrical circuit. The mixing step may further include mixing the composite with a volatile solvent to produce a selected viscosity. Then, a three-dimensional printer may be used to print the product, such as an electrical circuit, on a substrate. The product is cured in an atmosphere that absorbs the solvent. The conductivity of the mixture may be adjusted by adjusting the weight percentage of the metal coated carbon nanotube networks from 50% to 90%, but a preferred range is between 75% and 85%.Type: GrantFiled: March 15, 2022Date of Patent: November 14, 2023Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
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Publication number: 20220199281Abstract: An electrically conductive, flexible, strain resilient product is produced by mixing metal coated carbon nanotube networks with a liquid polymeric resin to produce a liquid mixture, and the mixture is cured to produce the product. The networks may include welded junctions between nanotubes formed by depositing and melting metal nanoparticles on the nanotubes to form the metal coating. After the mixing step the liquid mixture may be deposited on a flexible substrate in the form of an electrical circuit. The mixing step may further include mixing the composite with a volatile solvent to produce a selected viscosity. Then, a three-dimensional printer may be used to print the product, such as an electrical circuit, on a substrate. The product is cured in an atmosphere that absorbs the solvent. The conductivity of the mixture may be adjusted by adjusting the weight percentage of the metal coated carbon nanotube networks from 50% to 90%, but a preferred range is between 75% and 85%.Type: ApplicationFiled: March 15, 2022Publication date: June 23, 2022Inventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
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Patent number: 11309100Abstract: An electrically conductive, flexible, strain resilient product is produced by mixing metal coated carbon nanotube networks with a liquid polymeric resin to produce a liquid mixture, and the mixture is cured to produce the product. The networks may include welded junctions between nanotubes formed by depositing and melting metal nanoparticles on the nanotubes to form the metal coating. After the mixing step the liquid mixture may be deposited on a flexible substrate in the form of an electrical circuit. The mixing step may further include mixing the composite with a volatile solvent to produce a selected viscosity. Then, a three-dimensional printer may be used to print the product, such as an electrical circuit, on a substrate. The product is cured in an atmosphere that absorbs the solvent. The conductivity of the mixture may be adjusted by adjusting the weight percentage of the metal coated carbon nanotube networks from 50% to 90%, but a preferred range is between 75% and 85%.Type: GrantFiled: September 10, 2020Date of Patent: April 19, 2022Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
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Patent number: 10854351Abstract: An electrically conductive, flexible, strain resilient product is produced by mixing metal coated carbon nanotube networks with a liquid polymeric resin to produce a liquid mixture, and the mixture is cured to produce the product. The networks may include welded junctions between nanotubes formed by depositing and melting metal nanoparticles on the nanotubes to form the metal coating. After the mixing step the liquid mixture may be deposited on a flexible substrate in the form of an electrical circuit. The mixing step may further include mixing the composite with a volatile solvent to produce a selected viscosity. Then, a three-dimensional printer may be used to print the product, such as an electrical circuit, on a substrate. The product is cured in an atmosphere that absorbs the solvent. The conductivity of the mixture may be adjusted by adjusting the weight percentage of the metal coated carbon nanotube networks from 50% to 90%, but a preferred range is between 75% and 85%.Type: GrantFiled: August 30, 2018Date of Patent: December 1, 2020Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
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Patent number: 9696270Abstract: An apparatus for thermal conductance measurement includes a first heater assembly having a beam, a platen disposed at an end of the beam, and a heating element and a Resistance Temperature Device (RDT) disposed on the platen. The embodiment further includes a second heater assembly having a second beam, a second platen disposed at an end of the second beam, and a second heating element and a second Resistance Temperature Device (RDT) disposed on the platen. A test rig is also included, and the first heater and second heater assembly are mated to the test rig and separated by a gap length.Type: GrantFiled: June 9, 2014Date of Patent: July 4, 2017Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Ajit K Roy, Robert Wheeler, IV, Sabyashachi Ganguli
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Patent number: 7226932Abstract: Oral pharmaceutical formulation which improves the bioavailability of pharmaceuticals which are substantially water and oil insoluble is disclosed. In addition to the pharmaceutical, the formulation includes an emulsifier, an oil and an solubilizer. Alternatively, the formulation includes an aqueous solution of solubilizer.Type: GrantFiled: April 29, 2003Date of Patent: June 5, 2007Assignee: G.D. Searle LLCInventors: Rajeev Gokhale, Martin J. Griffin, James E. Truelove, James C. Stolzenbach, Aziz Karim, Ajit K. Roy
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Publication number: 20040048934Abstract: Oral pharmaceutical formulation which improves the bioavailability of pharmaceuticals which are substantially water and oil insoluble is disclosed. In addition to the pharmaceutical, the formulation includes an emulsifier, an oil and an solubilizer. Alternatively, the formulation includes an aqueous solution of solubilizer.Type: ApplicationFiled: April 29, 2003Publication date: March 11, 2004Applicant: G.D. Searle & Co.Inventors: Rajeev Gokhale, Martin J. Griffin, James E. Truelove, James C. Stolzenbach, Aziz Karim, Ajit K. Roy
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Patent number: 6431007Abstract: An accurate, low-cost, non-contact strain measuring method and apparatus for measuring strain in low modulus porous materials using optical microscopy are described wherein, in a preferred embodiment of the invention, fluorescent ink reference lines are applied to a surface of a specimen, the specimen is mounted on the stage of an optical microscope having an attached x-y digital micrometer, and a load is applied to the specimen. The surface is viewed using a light source that renders the reference lines visible, and changes in displacement of selected points on the reference lines are measured for each incremental loading. Poisson's ratio may be calculated from the strain measurements in two orthogonal directions.Type: GrantFiled: July 2, 2001Date of Patent: August 13, 2002Assignee: United States of America as represented by the Secretary of the Air ForceInventor: Ajit K. Roy