Patents by Inventor Kumi Jayaratne

Kumi Jayaratne 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).

  • Catalysts for olefin polymerization
    Publication number: 20060234857
    Abstract: This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a catalyst composition. One aspect of this invention is the formation and use of a catalyst composition comprising a transition metal compound and an activator for olefin polymerization processes.
    Type: Application
    Filed: April 13, 2005
    Publication date: October 19, 2006
    Inventors: Kumi Jayaratne, Michael Jensen, Matthew Thorn, Max McDaniel, Paul Barbee, Qing Yang
  • Catalyst compositions for producing polyolefins in the absence of cocatalysts
    Publication number: 20050113243
    Abstract: This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a supported catalyst composition. One aspect of this invention is the prepraration and use of a catalyst composition comprising a hydrocarbyl-substituted metallocene compound and a chemically-treated solid oxide for olefin polymerization processes. In another aspect, for example, this invention encompasses the preparation of a catalyst composition comprising (?5-cycloalkadienyl)2Zr(hydrocarbyl)2 complexes and sulfated alumina, but containing no organoaluminum or organoboron cocataysts, and further the use of this catalyst composition for polymerizing olefins.
    Type: Application
    Filed: November 21, 2003
    Publication date: May 26, 2005
    Inventors: Matthew Thorn, Qing Yang, Kumi Jayaratne