Patents by Inventor Justin T. Vaughn

Justin T. Vaughn 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: 20210324142
    Abstract: A cross-linked polyimide of the reaction product of a crosslinking agent and a polyimide. The cross-linking agent having at least two cross-linking moieties and the polyimide has a plurality of polyimide chains having an aryl constituent with a moiety comprised of a reactive substituent. The polyimide has crosslinks from the reaction of the reactive substituent of the aryl constituents of the polyimide chains and the cross-linking moieties of the cross-linking agent. The cross-linking may be induced by thermally treating a mixture of the polyimide and crosslinking agent above about 150° C. to a temperature where the polyimide begins to decompose under an inert atmosphere. The membrane can be used for separations involving gases such as hydrogen and light hydrocarbons.
    Type: Application
    Filed: August 20, 2019
    Publication date: October 21, 2021
    Applicants: Dow Global Technologies LLC, Georgia Tech Research Corporation
    Inventors: Justin T. Vaughn, Wulin Qiu, William J. Koros, Liren Xu, Mark K. Brayden
  • Publication number: 20210229030
    Abstract: The invention is an improved method of making an improved carbon molecular sieve (CMS) membrane in which a precursor polymer (e.g., polyimide) is pyrolyzed at a pyrolysis temperature to form a CMS membrane that is cooled to ambient temperature (about 40° C. or 30° C. to about 20° C.). The CMS membrane is then reheated to a reheating temperature less than the pyrolysis temperature to form the improved CMS membrane. The improved CMS membranes have shown an improved combination of selectivity and permeance as well as stability for separating hydrogen from gas molecules (e.g., methane, ethane, propane, ethylene, propylene, butane, carbon dioxide, nitrogen, butylene, and combinations thereof).
    Type: Application
    Filed: April 3, 2019
    Publication date: July 29, 2021
    Applicants: Dow Global Technologies LLC, Georgia Tech Research Corporation
    Inventors: Justin T. Vaughn, Wulin Qiu, William J. Koros, Liren Xu, Mark K. Brayden, Marcos V. Martinez
  • Publication number: 20190247806
    Abstract: A polyimide separation membrane is comprised of a polyimide, a halogen compound (e.g., halogenated aromatic epoxide) that is soluble in the polyimide and a hydrocarbon having 2 to 5 carbons (e.g., ethane, ethylene, propane or propylene). The gas separation membrane has improved selectivity for small gas molecules such as hydrogen compared to polyimide membrane not containing the halogen compound or hydrocarbon. The polyimide separation membrane may be made by shaping a dope solution comprised of a polyimide, a halogen containing compound that is soluble in the polyimide, removing the solvent and then exposing the untreated polyimide membrane to a treating atmosphere comprising a hydrocarbon having 2 to 5 carbons for a sufficient time to form the polyimide membrane.
    Type: Application
    Filed: September 25, 2017
    Publication date: August 15, 2019
    Inventors: Liren Xu, Justin T. Vaughn, Wulin Qiu, William J. Koros, Mark K. Brayden, Marcos V. Martinez