Patents by Inventor Herbert G. Hummel

Herbert G. Hummel 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).

  • Efficiency of a pre-polymerized catalyst
    Patent number: 5122583
    Abstract: The invention provides a process for increasing the efficiency of pre-polymerized catalysts used in the polymerization of olefins. The invention includes contacting a pre-polymerized catalyst with a cocatalyst or a mixture of cocatalyst and an electron donor prior to introducing the catalyst into a polymerization reaction zone.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: June 16, 1992
    Assignee: Fina Technology, Inc.
    Inventors: John A. Ewen, Alan H. Bitzer, David L. Gressett, Herbert G. Hummel