Patents by Inventor Kathleen D. Schramm

Kathleen D. Schramm 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).

  • High activity catalyst system for the production of propylene polymers
    Patent number: 5126417
    Abstract: A catalyst system comprising:(i) a catalyst precursor, which includes: magnesium; titanium; a halogen, which is chlorine, bromine, or iodine, or a mixture thereof; one or two inside electron donors; and a cerium (IV) compound;(ii) a hydrocarbylaluminum cocatalyst; and(iii) a selectivity control agent. wherein the atomic ratio of aluminum to titanium is in the range of about 5 to about 300 and the molar ratio of aluminum to selectivity control agent is in the range of about 0.1 to about 100.
    Type: Grant
    Filed: June 11, 1991
    Date of Patent: June 30, 1992
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Kathleen D. Schramm, Frederick J. Karol
  • Novel coimpregnated vanadium-zirconium catalyst for making polyethylene with broad or bimodal MW distribution
    Patent number: 5070055
    Abstract: A supported, electron donor-complexed reduced vanadium.sup.(<3) /zirconium coimpregnated catalyst possessing enhanced activity, the methods of its manufacture and ethylene polymers of broad molecular weight distribution produced therewith.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: December 3, 1991
    Assignee: Union Carbide Chemicals and Plastics Technology Corporation
    Inventors: Kathleen D. Schramm, Frederick J. Karol
  • High activity catalyst system for the production of propylene polymers
    Patent number: 5037909
    Abstract: A catalyst system comprising:(i) a catalyst precursor, which includes: magnesium; titanium; a halogen, which is chlorine, bromine, or iodine, or a mixture thereof; one or two inside electron donors; and a cerium (IV) compound;(ii) a hydrocarbylaluminum cocatalyst; and(iii) a selectivity control agent wherein the atomic ratio of aluminum to titanium is in the range of about 5 to about 300 and the molar ratio of aluminum to selectivity control agent is in the range of about 0.1 to about 100.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: August 6, 1991
    Assignee: Union Carbide Chemicals and Plastics Technology Corporation
    Inventors: Kathleen D. Schramm, Frederick J. Karol
  • High activity catalyst system for the production of propylene polymers
    Patent number: 4983562
    Abstract: A catalyst system comprising:(i) a catalyst precursor, which includes: magnesium; titanium; a halogen, which is chlorine, bromine, or iodine, or a mixture thereof; one or two inside electron donors; and a cerium (IV) compound;(ii) a hydrocarbylaluminum cocatalyst; and(iii) a selectivity control agent wherein the atomic ratio of aluminum to titanium is in the range of about 5 to about 300 and the molar ratio of aluminum to selectivity control agent is in the range of about 0.1 to about 100.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: January 8, 1991
    Assignee: Union Carbide Chemicals and Plastics Company Inc.
    Inventors: Kathleen D. Schramm, Frederick J. Karol