Patents by Inventor Longgui Tang

Longgui Tang 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).

  • Manufacture of intermediate modulus carbon fiber
    Patent number: 11479881
    Abstract: The present disclosure relates generally to carbon fibers having high tensile strength and modulus of elasticity, as well as a process for the manufacture of such carbon fiber. The process comprises spinning a polymer/solvent solution into a solvent/water bath in the range of 78%-85% solvent, thereby producing a dense fiber structure, and subsequently carbonizing the polymer precursor fiber at a lower than typical carbonization temperature to form carbon fibers.
    Type: Grant
    Filed: February 15, 2016
    Date of Patent: October 25, 2022
    Assignee: Cytec Industries Inc.
    Inventors: John Desmond Cook, Thomas Taylor, Girish Vishnukant Deshpande, Longgui Tang, Barry DeWayne Meece, Suzanne Crawford, Shao C. Chiu, Billy D. Harmon, Alan Thomas
  • Polyacrylonitrile (PAN) polymers with low polydispersity index (PDI) and carbon fibers made therefrom
    Patent number: 10647844
    Abstract: A method for synthesizing polyacrylonitrile (PAN) polymer with a narrow molecular weight distribution is disclosed. The preferred PAN polymer has a PDI (Mw/Mn) of about 2 or less. Such PAN polymer is synthesized by controlled/living radical polymerization using a special RAFT (Reversible Addition-Fragmentation Chain Transfer) agent. Also disclosed is a method for producing carbon fibers from PAN polymer with low PDI.
    Type: Grant
    Filed: January 25, 2019
    Date of Patent: May 12, 2020
    Assignee: Cytec Industries Inc.
    Inventors: Longgui Tang, Alan D. Thomas, Billy D. Harmon
  • POLYACRYLONITRILE (PAN) POLYMERS WITH LOW POLYDISPERSITY INDEX (PDI) AND CARBON FIBERS MADE THEREFROM
    Publication number: 20190153211
    Abstract: A method for synthesizing polyacrylonitrile (PAN) polymer with a narrow molecular weight distribution is disclosed. The preferred PAN polymer has a PDI (Mw/Mn) of about 2 or less. Such PAN polymer is synthesized by controlled/living radical polymerization using a special RAFT (Reversible Addition-Fragmentation Chain Transfer) agent. Also disclosed is a method for producing carbon fibers from PAN polymer with low PDI.
    Type: Application
    Filed: January 25, 2019
    Publication date: May 23, 2019
    Applicant: Cytec Industries Inc.
    Inventors: Longgui TANG, Alan D. THOMAS, Billy D. HARMON
  • Polyacrylonitrile (PAN) polymers with low polydispersity index (PDI) and carbon fibers made therefrom
    Patent number: 10189985
    Abstract: A method for synthesizing polyacrylonitrile (PAN) polymer with a narrow molecular weight distribution is disclosed. The preferred PAN polymer has a PDI (Mw/Mn) of about 2 or less. Such PAN polymer is synthesized by controlled/living radical polymerization using a special RAFT (Reversible Addition-Fragmentation Chain Transfer) agent. Also disclosed is a method for producing carbon fibers from PAN polymer with low PDI.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: January 29, 2019
    Assignee: CYTEC INDUSTRIES INC.
    Inventors: Longgui Tang, Alan D. Thomas, Billy D. Harmon
  • POLYACRYLONITRILE (PAN) POLYMERS WITH LOW POLYDISPERSITY INDEX (PDI) AND CARBON FIBERS MADE THEREFROM
    Publication number: 20180207849
    Abstract: A method for synthesizing polyacrylonitrile (PAN) polymer with a narrow molecular weight distribution is disclosed. The preferred PAN polymer has a PDI (Mw/Mn) of about 2 or less. Such PAN polymer is synthesized by controlled/living radical polymerization using a special RAFT (Reversible Addition-Fragmentation Chain Transfer) agent. Also disclosed is a method for producing carbon fibers from PAN polymer with low PDI.
    Type: Application
    Filed: March 16, 2018
    Publication date: July 26, 2018
    Inventors: Longgui Tang, Alan D. Thomas, Billy D. Harmon
  • Method for producing carbon fibers from polyacrylonitrile (PAN) polymers with low polydispersity index (PDI)
    Patent number: 9957645
    Abstract: A method for synthesizing polyacrylonitrile (PAN) polymer with a narrow molecular weight distribution is disclosed. The preferred PAN polymer has a PDI (Mw/Mn) of about 2 or less. Such PAN polymer is synthesized by controlled/living radical polymerization using a special RAFT (Reversible Addition-Fragmentation Chain Transfer) agent. Also disclosed is a method for producing carbon fibers from PAN polymer with low PDI.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: May 1, 2018
    Assignee: CYTEC INDUSTRIES INC.
    Inventors: Longgui Tang, Alan D. Thomas, Billy D. Harmon
  • MANUFACTURE OF INTERMEDIATE MODULUS CARBON FIBER
    Publication number: 20170362742
    Abstract: The present disclosure relates generally to carbon fibers having high tensile strength and modulus of elasticity, as well as a process for the manufacture of such carbon fiber. The process comprises spinning a polymer/solvent solution into a solvent/water bath in the range of 78%-85% solvent, thereby producing a dense fiber structure, and subsequently carbonizing the polymer precursor fiber at a lower than typical carbonization temperature to form carbon fibers.
    Type: Application
    Filed: February 15, 2016
    Publication date: December 21, 2017
    Applicant: Cytec Industries Inc.
    Inventors: John Desmond COOK, Thomas TAYLOR, Girish Vishnukant DESHPANDE, Longgui TANG, Barry DeWayne MEECE, Suzanne CRAWFORD, Shao C. CHIU, Billy D. Harmon, Alan THOMAS
  • Method for manufacturing sized carbon fibers for composite applications
    Patent number: 9757768
    Abstract: Various embodiments directed towards methods of applying sizing to fibers are disclosed herein. In some embodiments, solvent can be used to dissolve a sizing material into a solution, which can then be used to coat the fibers. In some embodiments, a water bath is used to coagulate a sizing on the fiber surface and to remove the remove solvent after coating the fibers, so that water vapor can be created during a subsequent drying step as opposed to solvent vapors. In some embodiments, strong acids or strong bases can be used as the solvent.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: September 12, 2017
    Assignee: CYTEC INDUSTRIES INC.
    Inventors: Shao C. Chiu, Longgui Tang, Billy D. Harmon
  • MANUFACTURE OF INTERMEDIATE MODULUS CARBON FIBER
    Publication number: 20160263803
    Abstract: The present disclosure relates generally to carbon fibers having high tensile strength and modulus of elasticity, as well as a process for the manufacture of such carbon fiber. The process comprises spinning a polymer/solvent solution into a solvent/water bath in the range of 78%-85% solvent, thereby producing a dense fiber structure, and subsequently carbonizing the polymer precursor fiber at a lower than typical carbonization temperature to form carbon fibers.
    Type: Application
    Filed: February 15, 2016
    Publication date: September 15, 2016
    Applicant: Cytec Industries Inc.
    Inventors: John Desmond Cook, Thomas Taylor, Girish Vishnukant Deshpande, Longgui Tang, Barry DeWayne Meece, Suzanne Crawford, Shao C. Chiu, Billy D. Harmon, Alan Thomas
  • CARBON FIBERS AND HIGH PERFORMANCE FIBERS FOR COMPOSITE APPLICATIONS
    Publication number: 20160221034
    Abstract: Various embodiments directed towards methods of applying sizing to fibers are disclosed herein. In some embodiments, solvent can be used to dissolve a sizing material into a solution, which can then be used to coat the fibers. In some embodiments, a water bath is used to coagulate a sizing on the fiber surface and to remove the remove solvent after coating the fibers, so that water vapor can be created during a subsequent drying step as opposed to solvent vapors. In some embodiments, strong acids or strong bases can be used as the solvent.
    Type: Application
    Filed: November 24, 2014
    Publication date: August 4, 2016
    Applicant: CYTEC INDUSTRIES INC.
    Inventors: Shao C. Chiu, Longgui Tang, Billy D. Harmon
  • POLYACRYLONITRILE (PAN) POLYMERS WITH LOW POLYDISPERSITY INDEX (PDI) AND CARBON FIBERS MADE THEREFROM
    Publication number: 20150174807
    Abstract: A method for synthesizing polyacrylonitrile (PAN) polymer with a narrow molecular weight distribution is disclosed. The preferred PAN polymer has a PDI (Mw/Mn) of about 2 or less. Such PAN polymer is synthesized by controlled/living radical polymerization using a special RAFT (Reversible Addition-Fragmentation Chain Transfer) agent. Also disclosed is a method for producing carbon fibers from PAN polymer with low PDI.
    Type: Application
    Filed: November 21, 2014
    Publication date: June 25, 2015
    Applicant: CYTEC INDUSTRIES INC.
    Inventors: Longgui Tang, Alan D. Thomas, Billy D. Harmon