Patents by Inventor Takashi Ohashi

Takashi Ohashi 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).

  • Method for preparing polyurethanes using 3,9-bis(2-hydrazidoethyl)-2-4,8,10-tetraoxaspiro-[5,5]-undecane as chain extender
    Patent number: 3940369
    Abstract: Polyurethane is prepared by reacting a prepolymer having terminal isocyanate groups with 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: February 24, 1976
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toshio Yukuta, Takashi Ohashi
  • Method of producing dihalocyclopropane functional multicomponent copolymers
    Patent number: 3933768
    Abstract: A dihalocyclopropane functional multi-component copolymer is produced by reacting olefin bond units contained in the side chain or in the cyclic group in the main chain of a multi-component copolymer with dihalocarbene generated from halogenated hydrocarbon in the presence of a cation surfactant catalyst by using an alkali aqueous solution. The dihalocyclopropane functional multi-component copolymer has an excellent compatibility as a polymer to be blended with the general purpose rubber and as a halogenated rubber series industrial material.
    Type: Grant
    Filed: August 28, 1972
    Date of Patent: January 20, 1976
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toshio Yukuta, Takao Aoki, Kazuo Haga, Takashi Ohashi, Masumi Saito