Patents by Inventor Yuzo Saitoh

Yuzo Saitoh 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).

  • Gas distribution plate for use with fluidized-bed gas-phase polymerizer
    Patent number: 5599513
    Abstract: A gas distribution plate for use with a fluidized-bed gas-phase polymerizer comprising a flat plate and a plurality of cylindrical or frustoconical pieces each having an oblique hole or a spiral groove cut in its surface. Each piece fits into a hole in the flat plate.
    Type: Grant
    Filed: May 7, 1991
    Date of Patent: February 4, 1997
    Assignee: Showa Denko K.K.
    Inventors: Toru Masaki, Setuo Kawano, Yuzo Saitoh, Hirozo Ijiri
  • Process for producing olefin polymer
    Patent number: 5219960
    Abstract: A process of producing an olefin polymer by polymerizing an olefin in a multi-stage polymerization in the presence of a catalyst composed of a solid catalyst component containing a halogen and titanium, and an organoaluminum compound, while adding, to a reaction vessel for conducting a second-stage or later polymerization or a portion connecting a former part to a latter part, of the multi-stage polymerization reaction vessels,(a) a polyfunctional electron donor compound in an amount, based on the organoaluminum compound, of 0.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: June 15, 1993
    Assignee: Showa Denko K.K.
    Inventors: Hideki Tamano, Yuzo Saitoh