Patents by Inventor Yoichi Toyama

Yoichi Toyama 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 of polymerizing .alpha.-olefins
    Patent number: 4057680
    Abstract: In the method of polymerizing .alpha.-olefins by contacting an .alpha.-olefin under polymerization conditions with a stereospecific catalyst comprising a titanium trichloride component and an organoaluminium compound, the improvement wherein said titanium trichloride component is ground during or after contact with a treating agent, said treating agent being selected from at least one ofA. an alkylene oxide, andB. a lactone.
    Type: Grant
    Filed: August 10, 1976
    Date of Patent: November 8, 1977
    Assignee: Showa Denko Kabushiki Kaisha
    Inventors: Isamu Yamazaki, Yoichi Toyama, Kiwami Hirota, Hisashi Takeuchi