Patents by Inventor Kazutoshi Nomiyama

Kazutoshi Nomiyama 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).

  • Process for producing polyethylenes
    Patent number: 5079317
    Abstract: A process for producing polyethylene is disclosed in which ethylene is polymerized in the presence of a composite catalyst. The catalyst is made up of a solid catalyst component typified by a selected chromium compound, a modified aluminum compound typified by a trialkylaluminum and an R.sub.n.sup.1 Al(OR.sup.2).sub.3-n compound wherein R.sup.1 and R.sup.2 are represented by selected hydrocarbon groups and n by 0.ltoreq.n.ltoreq.3. The polymer has improved melt index, flow parameter and melt tension characteristics.
    Type: Grant
    Filed: October 11, 1989
    Date of Patent: January 7, 1992
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Yoshino Tajima, Kazutoshi Nomiyama, Nobuyuki Kuroda, Kazuo Matsuura