Patents by Inventor Halie J. Martin

Halie J. Martin 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).

  • Plasticized melt spinning process using ionic liquids for production of polyacrylonitrile fibers
    Patent number: 11795583
    Abstract: A method for producing polyacrylonitrile (PAN) fiber, the method comprising: (i) mixing PAN with an ionic liquid in which the PAN is soluble to produce a PAN composite melt in which the PAN is dissolved in the ionic liquid; (ii) melt spinning the PAN composite melt to produce the PAN fiber; and (iii) washing the PAN fiber with a solvent in which the ionic liquid is soluble to substantially remove the ionic liquid from the PAN fiber. Also described herein is a method for producing carbon fiber from the PAN fiber as produced above, the method comprising oxidatively stabilizing the PAN fiber produced in step (iii), followed by carbonizing the stabilized PAN fiber to produce the carbon fiber. The initially produced PAN fiber, stabilized PAN fiber, resulting carbon fiber, and articles made thereof are also described.
    Type: Grant
    Filed: January 21, 2022
    Date of Patent: October 24, 2023
    Assignees: UT-Battelle, LLC, University of Tennessee Research Foundation
    Inventors: Sheng Dai, Huimin Luo, Halie J. Martin
  • PLASTICIZED MELT SPINNING PROCESS USING IONIC LIQUIDS FOR PRODUCTION OF POLYACRYLONITRILE FIBERS
    Publication number: 20220235493
    Abstract: A method for producing polyacrylonitrile (PAN) fiber, the method comprising: (i) mixing PAN with an ionic liquid in which the PAN is soluble to produce a PAN composite melt in which the PAN is dissolved in the ionic liquid; (ii) melt spinning the PAN composite melt to produce the PAN fiber; and (iii) washing the PAN fiber with a solvent in which the ionic liquid is soluble to substantially remove the ionic liquid from the PAN fiber. Also described herein is a method for producing carbon fiber from the PAN fiber as produced above, the method comprising oxidatively stabilizing the PAN fiber produced in step (iii), followed by carbonizing the stabilized PAN fiber to produce the carbon fiber. The initially produced PAN fiber, stabilized PAN fiber, resulting carbon fiber, and articles made thereof are also described.
    Type: Application
    Filed: January 21, 2022
    Publication date: July 28, 2022
    Inventors: Sheng Dai, Huimin Luo, Halie J. Martin