Patents by Inventor Kiyotaka Ishida

Kiyotaka Ishida 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).

  • Catalyst component for olefin polymerization catalyst for olefin polymerization, and process for preparing polyolefin
    Patent number: 6303714
    Abstract: The present invention provides an olefin polymerization catalyst component comprising a transition metal compound represented by general formula (1) LmCpnMX1X2  (1) an olefin polymerization catalyst containing the catalyst component as a transition metal component, and a method of producing a polyolefin using the catalyst. According to the present invention, polyolefins having a wide molecular weight distribution and excellent moldability and containing small amounts of low molecular weight components can be produced with high activity.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: October 16, 2001
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Nobuyuki Kibino, Kiyotaka Ishida, Tsugihiko Hakozaki, Tsutomu Sakuragi, Shigenobu Miyake, Shintaro Inazawa
  • Catalyst component for producing polyolefin, catalyst for producing polyolefin comprising the catalyst component, and process for producing polyolefin in the presence of the catalyst
    Patent number: 5770664
    Abstract: A catalyst component for producing polyolefin, a catalyst for producing polyolefin using the catalyst component, and a process for producing polyolefin in the presence of the catalyst. The catalyst component comprises a metallocene compound represented by formula (1): ##STR1## All the symbols in formula (1) are defined in the description.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: June 23, 1998
    Assignee: Japan Polyolefins Co., Ltd.
    Inventors: Yoshikuni Okumura, Nobuyuki Kibino, Tetsuya Maki, Akihiro Hori, Kiyotaka Ishida, Shigenobu Miyake, Shintaro Inazawa