Patents by Inventor Robert Tan Li

Robert Tan 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).

  • Metallocene compositions
    Patent number: 6376412
    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 John Burkhardt, William T. Haygood, Jr., Robert Tan Li, James Charles Vizzini, Matthew Cornyn Kuchta, Udo M. Stehling, James R. Hart
  • Propylene impact copolymers
    Patent number: 6342566
    Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: January 29, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Jr., Francis C. Rix, Dawn C. Wiser
  • Propylene impact copolymers
    Publication number: 20010034411
    Abstract: This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.
    Type: Application
    Filed: May 21, 2001
    Publication date: October 25, 2001
    Inventors: Terry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Francis C. Rix, Dawn C. Wiser
  • Linear vinylene carbonate/1-olefin copolymer and articles formed therefrom
    Patent number: 6143857
    Abstract: Substantially linear vinylene carbonate/1-olefin copolymers, a process of forming the same, and packaging materials incorporating the same are described. These copolymers are formed by reacting the component monomers in the presence of a single component, non-ionic polymerization catalyst at relatively low temperatures and pressures.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: November 7, 2000
    Assignee: Cryovac, Inc.
    Inventors: Donald Albert Bansleben, Stefan Kilian Friedrich, Robert Howard Grubbs, Robert Tan Li, Chunming Wang, Todd Ross Younkin
  • Cyclopentadienyl transition metal compounds useful as polymerization catalysts
    Patent number: 6100414
    Abstract: Disclosed are novel cyclopentadienyl transition metal compounds that are stable under a wide variety of conditions, particularly under conditions that include exposure to water and oxygen containing media. These novel compounds can be utilized in preparing novel catalyst systems useful in polymerizing olefins. The cyclopentadienyl compound can specifically be [(C5H4CH2CH2N[H]Me2)TiCl3]+B[C6F5]4-. Also disclosed are processes for preparing the novel cyclopentadienyl transition metal compounds.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: August 8, 2000
    Assignee: Eastman Chemical Company
    Inventors: Robert Tan Li, Laughlin Gerard McCullough