Patents by Inventor Michele Lynn Grief-Rust

Michele Lynn Grief-Rust 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).

  • Methods of polymerizing olefin monomers with mixed catalyst systems
    Patent number: 6833416
    Abstract: A method of transitioning catalysts for polyolefin polymerization is provided. In one aspect, the process includes providing a polymerization reactor that includes a first catalyst system, contacting olefin monomers with the first catalyst system to form polyolefin in a first polymerization reaction and introducing a catalyst killer to the polymerization reactor in an amount sufficient to terminate the first polymerization reaction. The method further includes introducing a second catalyst system to the polymerization reactor in the presence of at least a portion of the catalyst killer, wherein the at least a portion of the catalyst killer is an amount sufficient to activate the second catalyst system and contacting olefin monomers with the second catalyst system to form polyolefin in a second polymerization reaction.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: December 21, 2004
    Assignee: Univation Technologies, LLC
    Inventors: Michael Allen Kinnan, Fred David Ehrman, Pradeep Pandurang Shirodkar, Mark Bradley Davis, Michele Lynn Grief-Rust
  • Methods of polymerizing olefin monomers with mixed catalyst systems
    Publication number: 20040186250
    Abstract: A method of transitioning catalysts for polyolefin polymerization is provided. In one aspect, the process includes providing a polymerization reactor that includes a first catalyst system, contacting olefin monomers with the first catalyst system to form polyolefin in a first polymerization reaction and introducing a catalyst killer to the polymerization reactor in an amount sufficient to terminate the first polymerization reaction. The method further includes introducing a second catalyst system to the polymerization reactor in the presence of at least a portion of the catalyst killer, wherein the at least a portion of the catalyst killer is an amount sufficient to activate the second catalyst system and contacting olefin monomers with the second catalyst system to form polyolefin in a second polymerization reaction.
    Type: Application
    Filed: February 27, 2004
    Publication date: September 23, 2004
    Inventors: Michael Allen Kinnan, Fred David Ehrman, Pradeep Pandurang Shirodkar, Mark Bradley Davis, Michele Lynn Grief-Rust