Patents by Inventor Hideto Kitada

Hideto Kitada 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).

  • Method for operating reactor for polymerizing olefins
    Patent number: 5543478
    Abstract: In the preparation of polyolefin in a vapor phase polymerization using catalysts comprising a solid catalyst component containing titanium and/or vanadium; and magnesium and an organoaluminum compound, when the reaction is stopped for a certain period of time, the restarting of reaction is possible by feeding in the first place an organoaluminum compound into the reaction system with retaining of polymer particles in the reactor.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: August 6, 1996
    Assignee: Nippon Petrochemicals Company, Limited
    Inventors: Masahiro Niwa, Yuji Sugano, Ken-ichi Uenishi, Hideto Kitada, Yoshihisa Yamaguchi, Eiko Kobayashi, Kunimichi Kubo, Akira Sano