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).

  • Publication number: 20240029915
    Abstract: 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: Application
    Filed: October 5, 2023
    Publication date: January 25, 2024
    Inventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
  • Patent number: 11817232
    Abstract: 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: Grant
    Filed: March 15, 2022
    Date of Patent: November 14, 2023
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
  • Publication number: 20220199281
    Abstract: 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: Application
    Filed: March 15, 2022
    Publication date: June 23, 2022
    Inventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
  • Patent number: 11309100
    Abstract: 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: Grant
    Filed: September 10, 2020
    Date of Patent: April 19, 2022
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
  • Patent number: 10854351
    Abstract: 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: Grant
    Filed: August 30, 2018
    Date of Patent: December 1, 2020
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventors: Sabyasachi Ganguli, Ajit K Roy, Chenggang Chen
  • Patent number: 9696270
    Abstract: 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: Grant
    Filed: June 9, 2014
    Date of Patent: July 4, 2017
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Ajit K Roy, Robert Wheeler, IV, Sabyashachi Ganguli
  • Patent number: 7226932
    Abstract: 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: Grant
    Filed: April 29, 2003
    Date of Patent: June 5, 2007
    Assignee: G.D. Searle LLC
    Inventors: Rajeev Gokhale, Martin J. Griffin, James E. Truelove, James C. Stolzenbach, Aziz Karim, Ajit K. Roy
  • Publication number: 20040048934
    Abstract: 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: Application
    Filed: April 29, 2003
    Publication date: March 11, 2004
    Applicant: G.D. Searle & Co.
    Inventors: Rajeev Gokhale, Martin J. Griffin, James E. Truelove, James C. Stolzenbach, Aziz Karim, Ajit K. Roy
  • Patent number: 6431007
    Abstract: 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: Grant
    Filed: July 2, 2001
    Date of Patent: August 13, 2002
    Assignee: United States of America as represented by the Secretary of the Air Force
    Inventor: Ajit K. Roy