Patents by Inventor Yamagata Tomoyuki

Yamagata Tomoyuki 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).

  • Polyurethane elastomer
    Patent number: 5071887
    Abstract: A polyurethane elastomer produced by reaction of a polyisocyanate with an amine-type polyol and another type polyol, the polyisocyanate being an isocyanurate-modified hexamethyelene diisocyanate; and the equivalent ratio of active hydrogen to isocyanate group to be reacted being in a range of from 0.8 to 1.6; and the ratio of the amine-type polyol to the another type polyol being in a range of from 10/90 to 100/0 by weight.
    Type: Grant
    Filed: February 15, 1990
    Date of Patent: December 10, 1991
    Assignee: Nippon Polyurethane Industry Co., Ltd.
    Inventors: Shigeru Nakagawa, Kiyofumi Murayama, Yukio Ohbuchi, Yamagata Tomoyuki