Patents by Inventor Yukio Ohbuchi

Yukio Ohbuchi 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
  • Thermoplastic polyurethane resin from p-phenylene diisocyanate, a poly(hexamethylene carbonate) polyol, and a short chain polyol
    Patent number: 5066762
    Abstract: A thermoplastic polyurethane resin is prepared by the reaction of(A) p-phenylene diisocyanate,(B) a hydroxyl terminated poly(hexamethylene carbonate) polyol having a molecular weight of 850 to 5000 and(C) a short chain polyol having 2 to 10 carbon atoms as the chain extending agent,the molar ratio of (B) : (C) being 1:2 to 1:0.05, and the molar ratio of isocyanate groups : total active hydrogen groups being 0.93:1 to 1.20:1.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: November 19, 1991
    Assignee: Nippon Polyurethane Industry Co., Ltd.
    Inventors: Yukio Ohbuchi, Yoshiaki Maeda, Masahiro Kawasaki, Susumu Sato, Mamoru Akimoto
  • Thermosetting urethane elastomer
    Patent number: 5021534
    Abstract: A thermosetting urethane elastomer is prepared from:(a) a prepolymer having isocyanate groups at terminal ends obtained by allowing p-phenylene diisocyanate to react with a compound having 2 or more active hydrogens, and(b) curing agents of 1,4-bis(2-hydroxyethoxy)benzene and trimethylolpropane or 1,4-bis(2-hydroxyethoxy)benzene and a polyol having isocyanurate ring.
    Type: Grant
    Filed: June 27, 1990
    Date of Patent: June 4, 1991
    Assignee: Nippon Polyurethane Industry Co., Ltd.
    Inventors: Masahiro Kawasaki, Yukio Ohbuchi, Yoshiaki Maeda, Susumu Sato