Patents by Inventor Masaru Hirokawa

Masaru Hirokawa 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 of regenerating cation exchange membrane by treatment with strong acid at above 110.degree. C.
    Patent number: 4526904
    Abstract: A method for regenerating a perfluorinated cation exchange polymer membrane which can give only a low current efficiency as a result of being used as a diaphragm in an electrolytic cell or an electrodialyzer, said method comprising maintaining said perfluorinated cation exchange polymer membrane at a temperature of at least 110.degree. C. while keeping it in contact with an aqueous solution of a strong acid having a pH at ordinary temperature of not more than 1.0.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: July 2, 1985
    Assignee: Kabushiki Kaisha Musashino Kagaku Kenkyusho
    Inventors: Konosuke Kishida, Masaru Hirokawa