Patents by Inventor Atushi Kitagawa

Atushi Kitagawa 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).

  • Pre-foamed particles of polypropylene-base resin
    Patent number: 4568608
    Abstract: In pre-foamed particles of a propylene-base resin obtained by foaming raw particles of the propylene-base resin, the relation, G.sub.1 -G.sub.2 .gtoreq.10%, exists between the content G.sub.1 (%) of matter, which is contained in the pre-foamed particles and is insoluble in boiling n-heptane, and the content G.sub.2 (%) of matter contained in the raw particles and insoluble in boiling n-heptane. The pre-foamed particles have excellent moldability and can hence provide with ease low-density (highly-expanded) molded articles, which enjoy superb dimensional accuracy, good surface conditions, low percent water absorption, excellent impact and chemical resistance.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: February 4, 1986
    Assignee: Japan Styrene Paper Corporation
    Inventors: Hideki Kuwabara, Toru Yamaguchi, Atushi Kitagawa