Patents by Inventor Kayoko Usui

Kayoko 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).

  • Method of manufacturing cation exchanger
    Patent number: 4077923
    Abstract: The method of manufacturing a cation exchanger which includes chopping up waste tires and then successively heat treating and then sulfonating the resultant product.
    Type: Grant
    Filed: November 25, 1975
    Date of Patent: March 7, 1978
    Assignee: Nittan Company, Limited
    Inventors: Kiichi Tanaka, Noboru Gomyo, Kayoko Usui, Yasuyo Takahata, Masaaki Tamayama