Patents by Inventor Tatuo Usui

Tatuo Usui 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).

  • Process for producing epihalohydrin copolymer rubber
    Patent number: 4299944
    Abstract: A process for producing an epihalohydrin copolymer rubber, which comprises copolymerizing an epihalohydrin with another epoxy compound using as a catalyst the reaction product of an organoaluminum compound, a phosphoric acid compound and 1,8-diaza-bicyclo(5,4,0)undecene-7 or its salt.
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: November 10, 1981
    Assignee: Nippon Zeon Co. Ltd.
    Inventors: Akio Maeda, Tatuo Usui, Atsushi Yasuda