Patents by Inventor Yoshihisa Yokota

Yoshihisa Yokota 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: 4242479
    Abstract: A process for polymerizing ethylene or copolymerizing ethylene with an .alpha.-olefin in the presence of a catalyst comprising: (A) a solid catalyst ingredient obtained by contacting (1) a solid reaction product prepared by reacting (a) a reaction product of an aluminum trihalide with an organic compound containing an Si--O bond and/or an ether compound and (b) a magnesium alcoholate with (2) a tetravalent titanium compound containing at least one halogen atom or further (3) an electron donor compound, and (B) an organo-aluminum compound.
    Type: Grant
    Filed: December 22, 1977
    Date of Patent: December 30, 1980
    Assignee: Showa Yuka Kabushiki Kaisha
    Inventors: Yoshihisa Yokota, Teruo Hosokawa, Kiichiro Sakashita