Patents by Inventor Katsufumi Tsuboi

Katsufumi Tsuboi 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).

  • Olefin polymerization catalyst and a polyolefin production method
    Patent number: 6071846
    Abstract: An olefin polymerization catalyst comprising (A) a solid titanium catalyst component containing a magnesium atom, titanium atom, halogen atom and electron donor, in which divalent titanium atom account for not more than 25 atomic % of the whole titanium atom and trivalent titanium atom account for at least 30 atomic % of the whole titanium atom and (B) an organoaluminum compound component having no halogen atom; and an olefin production method which comprises polymerizing an olefin in the presence of the above olefin polymerization catalyst.
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: June 6, 2000
    Assignee: Tokuyama Corporation
    Inventors: Yoshiyuki Kitajima, Katsufumi Tsuboi, Junichi Ito