Patents by Inventor Robert T. Li

Robert T. Li 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 group 14 bridged biscyclopentadienyl ligands
    Publication number: 20030220190
    Abstract: The present invention relates to ligands and the synthesis of those ligands for use in metallocene complexes. More particularly, the present invention relates to the synthesis of diarylsilyl bridged biscyclopentadienes using diarylsilyldisulfonates. Even more particularly, the present invention describes Group IV metallocenes containing diarylsilyl bridged bis-cyclopentadienyl ligands prepared from contacting a diarylsilyldisulfonate with an organometallic indenyl reagent.
    Type: Application
    Filed: October 16, 2002
    Publication date: November 27, 2003
    Inventors: Francis C Rix, Terry J Burkhardt, Robert T Li, William T Haygood
  • Metallocene compositions
    Publication number: 20030073568
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Application
    Filed: January 31, 2002
    Publication date: April 17, 2003
    Inventors: Matthew C. Kuchta, Udo M. Stehling, Robert T. Li, William T. Haygood, Terry J. Burkhardt
  • Metallocene compositions
    Publication number: 20030008767
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Application
    Filed: February 5, 2002
    Publication date: January 9, 2003
    Inventors: Terry J. Burkhardt, Udo M. Stehling, James R. Hart, William T. Haygood, Robert T. Li, James C. Vizzini, Matthew C. Kuchta
  • Metallocene compositions
    Publication number: 20020161143
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Application
    Filed: January 31, 2002
    Publication date: October 31, 2002
    Inventors: Terry J. Burkhardt, Udo M. Stehling, James R. Hart, William T. Haygood, Robert T. Li, James C. Vizzini, Matthew C. Kuchta
  • Metallocene compositions
    Patent number: 6380334
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 30, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew C. Kuchta, Udo M. Stehling, Robert T. Li, William T. Haygood, Terry J. Burkhardt
  • Metallocene compositions
    Patent number: 6380121
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 30, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew C. Kuchta, Udo M. Stehling, Robert T. Li, William T. Haygood, Jr., Terry J. Burkhardt
  • Metallocene compositions
    Patent number: 6380123
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 30, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew C. Kuchta, Udo M. Stehling, Robert T. Li, William T. Haygood, Jr., Terry J. Burkhardt
  • Metallocene compositions
    Patent number: 6380331
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 30, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew C. Kuchta, Udo M. Stehling, Robert T. Li, William T. Haygood, Terry J. Burkhardt
  • Metallocene compositions
    Patent number: 6380122
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 30, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew C. Kuchta, Udo M. Stehling, Robert T. Li, William T. Haygood, Jr., Terry J. Burkhardt
  • Metallocene compositions
    Patent number: 6376410
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 23, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Terry J. Burkhardt, Udo M. Stehling, James R. Hart, William T. Haygood, Jr., Robert T. Li, James C. Vizzini, Matthew C. Kuchta
  • Metallocene compositions
    Patent number: 6376413
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 23, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Matthew C. Kuchta, Udo M. Stehling, Robert T. Li, William T. Haygood, Jr., Terry J. Burkhardt
  • Metallocene compositions
    Patent number: 6376627
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 23, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Terry J. Burkhardt, Udo M. Stehling, James R. Hart, William T. Haygood, Jr., Robert T. Li, James C. Vizzini, Matthew C. Kuchta
  • Metallocene compositions
    Patent number: 6376408
    Abstract: This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: April 23, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Terry J. Burkhardt, Udo M. Stehling, James R. Hart, William T. Haygood, Jr., Robert T. Li, James C. Vizzini, Matthew C. Kuchta