Patents by Inventor Seiji Onogi

Seiji Onogi 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).

  • Patent number: 4029877
    Abstract: In a process for preparing a polyolefin without separation of catalyst residues by polymerizing an olefin in the pres ence of a Ziegler catalyst having high catalytic activity, in an inert gas sealing system; an improvement comprises separating the polyolefin containing the catalyst residue from the polymerization mixture, and contacting the polyolefin containing the catalyst residue with a weak reactive gas of oxygen and/or steam diluted with an inert gas.
    Type: Grant
    Filed: June 10, 1975
    Date of Patent: June 14, 1977
    Assignee: Mitsubishi Chemical Industries Ltd.
    Inventors: Hirohisa Yoshiura, Toshiharu Arai, Masao Miyake, Yoshikane Furuya, Seiji Onogi, Tetsushi Kamizono