Patents by Inventor William Haygood

William Haygood 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).

  • Bridged biscyclopentadienyl ligands and method of preparation
    Publication number: 20050250956
    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: July 13, 2005
    Publication date: November 10, 2005
    Inventors: Francis Rix, Terry Burkhardt, Robert Li, William Haygood
  • Polymerization process and polymer composition
    Publication number: 20050059785
    Abstract: Olefin polymerization processes using catalyst systems based on metallocenes and olefin, in particular, propylene polymers obtainable thereby. The metallocenes may be represented by the formula: wherein M1 preferably is zirconium or hafnium; and R12 is different from hydrogen.
    Type: Application
    Filed: October 27, 2004
    Publication date: March 17, 2005
    Inventors: James Hart, William Haygood, Terry Burkhardt, Robert Li
  • Metallocenes and catalyst compositions derived therefrom
    Publication number: 20050054520
    Abstract: Metallocenes and catalyst systems for olefin polymerization derived therefrom. The metallocenes may be represented by the formula: wherein M1 preferably is zirconium or hafnium; and R12 is different from hydrogen.
    Type: Application
    Filed: June 29, 2001
    Publication date: March 10, 2005
    Inventors: James Hart, William Haygood, Terry Burkhardt, Robert Li
  • Metallocenes and catalyst compositions derived therefrom
    Publication number: 20050037919
    Abstract: Metallocenes and catalyst systems for olefin polymerization derived therefrom.
    Type: Application
    Filed: December 10, 2001
    Publication date: February 17, 2005
    Inventors: Terry Burkhardt, James Hart, William Haygood, Robert Li