Patents by Inventor Alan H. Bitzer

Alan H. Bitzer 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
  • Catalyst pretreatment process
    Patent number: 4767735
    Abstract: A process for pretreating a Ziegler-type catalyst for use in olefin polymerization reactions. An olefin monomer is aded to a fluid carrier stream containing a Ziegler-type catalyst. The carrier stream containing the monomer and the catalyst is passed through an elongated tubular reactor at a flow rate sufficient to provide a residence time in the tubular reactor of less than 1 minute and under temperature conditions to prepolymerize the catalyst within the tubular reactor without plugging of the reactor. In a specific embodiment the residence time within the reactor is no more than 10 seconds, and more particularly, no more than 2 seconds.
    Type: Grant
    Filed: February 2, 1987
    Date of Patent: August 30, 1988
    Assignee: Cosden Technology, Inc.
    Inventors: John A. Ewen, Alan H. Bitzer