Patents by Inventor Kiyohiko Imai

Kiyohiko Imai 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 producing activated clay for treating aromatic hydrocarbons
    Patent number: 6120595
    Abstract: The present invention provides an activated clay for refining aromatic hydrocarbons such as BTX (benzene, toluene, xylene), etc., satisfying the requirements of both excellent life and excellent side-reaction-preventing property. The activated clay for treating aromatic hydrocarbons is obtained by treating dioctahedral smectite clay minerals with an acid so as to possess a BET specific surface area of not smaller than 250 m.sup.2 /g and to contain iron in an amount of not smaller than 2.5% by weight calculated as Fe.sub.2 O.sub.3.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: September 19, 2000
    Assignee: Mizusawa Industrial Chemicals, Ltd.
    Inventors: Seiji Kojima, Masashi Hatano, Hitoshi Yamamoto, Kiyohiko Imai