Patents by Inventor Lee Daniel Cremar

Lee Daniel Cremar 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).

  • Method of preparing doped and/or composite carbon fibers
    Patent number: 10422054
    Abstract: A method of producing doped carbon fibers, doped systems to prepare graphene-fiber hybrid structures, or doped carbon nanostructures, includes forming doped polymer precursors and decomposing at least a portion of the polymeric precursors to form carbon fibers. The decomposition may be accomplished by treating the doped polymer precursors with acid vapor from an aqueous acid solution at a temperature of less than 250° C.
    Type: Grant
    Filed: September 22, 2016
    Date of Patent: September 24, 2019
    Assignee: Board of Regents of the University of Texas System
    Inventors: Karen Lozano, Lee Daniel Cremar, Maria del Rocio Nava Lara, Mandana Akia
  • Method of preparing carbon fibers
    Patent number: 9988271
    Abstract: A method of producing carbon fiber, yarns, and nonwoven carbon fiber cloths, includes forming suitable polymeric precursor microfibers and/or nanofibers using a centrifugal spinning process and decomposing at least a portion of the polymeric precursor fibers to form carbon fibers. The decomposition may be accomplished by treating the polymeric precursor fibers with acid vapor from an aqueous acid solution at a temperature of less than 250° C.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: June 5, 2018
    Assignee: Board of Regents of the University of Texas System
    Inventors: Karen Lozano, Lee Daniel Cremar
  • METHOD OF PREPARING DOPED AND/OR COMPOSITE CARBON FIBERS
    Publication number: 20170081786
    Abstract: A method of producing doped carbon fibers, doped systems to prepare graphene-fiber hybrid structures, or doped carbon nanostructures, includes forming doped polymer precursors and decomposing at least a portion of the polymeric precursors to form carbon fibers. The decomposition may be accomplished by treating the doped polymer precursors with acid vapor from an aqueous acid solution at a temperature of less than 250° C.
    Type: Application
    Filed: September 22, 2016
    Publication date: March 23, 2017
    Inventors: Karen Lozano, Lee Daniel Cremar, Maria del Rocio Nava Lara, Mandana Akia
  • METHOD OF PREPARING CARBON FIBERS
    Publication number: 20150184317
    Abstract: A method of producing carbon fiber, yarns, and nonwoven carbon fiber cloths, includes forming suitable polymeric precursor microfibers and/or nanofibers using a centrifugal spinning process and decomposing at least a portion of the polymeric precursor fibers to form carbon fibers. The decomposition may be accomplished by treating the polymeric precursor fibers with acid vapor from an aqueous acid solution at a temperature of less than 250° C.
    Type: Application
    Filed: December 1, 2014
    Publication date: July 2, 2015
    Inventors: Karen Lozano, Lee Daniel Cremar