Patents by Inventor Toru Doiuchi

Toru Doiuchi 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).

  • Polyurethanes based on amino-acids or derivatives thereof
    Patent number: 3932359
    Abstract: Amino acid-urethane copolymers improved in elongation, tensile strength and flexing endurance are prepared by polymerizing a prepolymer having terminal isocyanate groups, obtained by reacting a polyether polyol having hydroxyl groups substantially at the terminals thereof with an organic polyisocyanate in a ratio in equivalent of the organic polyisocyanate to the polyether polyol of 1.6 to 2.5, either with an amino acid-N-carboxylic acid anhydride or with a polyamino acid polymer obtained by polymerizing an amino acid-N-carboxylic acid anhydride.
    Type: Grant
    Filed: August 29, 1973
    Date of Patent: January 13, 1976
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Yasuo Fujimoto, Keizo Tatsukawa, Masayuki Teranishi, Shinsuke Koshimoto, Toru Doiuchi