Patents by Inventor David C. Rolfing

David C. Rolfing 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).

  • Polymerization catalysts for producing polymers with low levels of long chain branching
    Patent number: 7470758
    Abstract: This invention relates to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene with bridging ?5-cyclopentadienyl-type ligands, in combination with a cocatalyst and an activator-support. The compositions and methods disclosed herein provide ethylene polymers with low levels of long chain branching.
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: December 30, 2008
    Assignee: Chevron Phillips Chemical Company, LP
    Inventors: Michael D. Jensen, Joel L. Martin, Max P. McDaniel, David C. Rolfing, Qing Yang, Matthew G. Thorn, Ashish M. Sukhadia, Youlu Yu, Jerry T. Lanier
  • Polymerization catalysts for producing polymers with low levels of long chain branching
    Patent number: 7148298
    Abstract: This invention relates to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene with bridging ?5-cyclopentadienyl-type ligands, in combination with a cocatalyst and an activator-support. The compositions and methods disclosed herein provide ethylene polymers with low levels of long chain branching.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: December 12, 2006
    Assignee: Chevron Phillips Chemical Company, L.P.
    Inventors: Michael D. Jensen, Joel L. Martin, Max P. McDaniel, David C. Rolfing, Qing Yang, Matthew G. Thorn, Ashish M. Sukhadia, Youlu Yu, Jerry T. Lanier