Patents by Inventor Lenore H. Crawford

Lenore H. Crawford 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).

  • Titanium (II) or zirconium (II) complexes and addition polymerization catalysts therefrom
    Patent number: 5624878
    Abstract: Novel catalytic derivatives of titanium or zirconium complexes containing one and only one cyclic delocalized, anionic, .PI.-bonded group wherein the metal is in the +2 formal oxidation state and having a bridged ligand structure and an activating cocatalyst are useful as catalysts for polymerizing olefins, diolefins and/or acetylenically unsaturated monomers.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: April 29, 1997
    Assignee: The Dow Chemical Company
    Inventors: David D. Devore, Francis J. Timmers, James C. Stevens, Robert D. Mussell, Lenore H. Crawford
  • Titanium (II) or Zirconium (II) complexes and addition polymerization catalysts therefrom
    Patent number: 5556928
    Abstract: A process for polymerizing olefins, diolefins and/or acetylenically unsaturated monomers using novel catalyst compositions comprising titanium or zirconium complexes containing one and only one cyclic delocalized, anionic, .pi.-bonded group wherein the metal is in the +2 formal oxidation state and having a bridged ligand structure, also referred to as constrained geometry complexes, and an activating cocatalyst.
    Type: Grant
    Filed: August 15, 1995
    Date of Patent: September 17, 1996
    Assignee: The Dow Chemical Company
    Inventors: David D. Devore, Francis J. Timmers, James C. Stevens, Robert D. Mussell, Lenore H. Crawford, David R. Wilson