Patents by Inventor Atuo Kuramoto

Atuo Kuramoto 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 terminating polyphenylene ethers reactions with amino carboxylic acids and reducing agents
    Patent number: 4058504
    Abstract: In the production of polyphenylene ethers by oxidative polycondensation of phenols in the presence of a complex catalyst, an aminocarboxylic acid derivative and a reducing agent are simultaneously added to the reaction mixture when the resulting polyphenylene ether has attained the desired degree of polymerization, thereby to terminate the polymerization and simultaneously purify the reaction mixture. Hence, a stable purified polymer can be obtained.
    Type: Grant
    Filed: April 16, 1976
    Date of Patent: November 15, 1977
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Eiichi Yonemitsu, Akitoshi Sugio, Atuo Kuramoto, Hiroyuki Urabe