Patents by Inventor Takuji Sumida

Takuji Sumida 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 chloroprene elastomer
    Patent number: 3988506
    Abstract: A process for producing a chloroprene elastomer, which comprises copolymerizing in the presence of a radical catalyst 80 to 95 parts by weight of 2-chlorobutadiene-1,3 containing less than 0.95% by weight of 1-chlorobutadiene-1,3 with 5 to 20 parts by weight of 2,3-dichlorobutadiene-1,3 at a polymerization temperature of not higher than 20.degree. C in the presence of a mercaptan compound and a process for producing a vulcanized chloroprene rubber.
    Type: Grant
    Filed: May 2, 1975
    Date of Patent: October 26, 1976
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Michio Dohi, Takuji Sumida, Katsuichi Yokobori