Patents by Inventor Tooru Hihara

Tooru Hihara 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 for stabilizing treatment of catalytic activity
    Patent number: 5169823
    Abstract: Disclosed herein is a method for the stabilizing treatment of a catalyst comprising washing the catalyst with hot washing water following the preparation of the catalyst, the catalyst being composed principally of chromium oxide and used in the production of chlorine by the oxidation of hydrogen chloride with an oxygen-containing gas, thereby improving its catalytic activity and prolonging its life.
    Type: Grant
    Filed: July 1, 1991
    Date of Patent: December 8, 1992
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yukihiro Yoshikawa, Tooru Hihara, Teruo Hirayama, Kunihiro Yamada, Shinji Takenaka
  • Chromium oxide catalyst impregnation regeneration method
    Patent number: 5093292
    Abstract: The catalytic activity of a chromium oxide-based catalyst used in the production of chlorine by oxidation of hydrogen chloride gas with an oxygen-containing gas is regenerated by impregnating it with an aqueous solution of chromic acid anhydride or of a chromium salt and then calcining the catalyst at a temperature not higher than 800.degree. C.
    Type: Grant
    Filed: November 20, 1990
    Date of Patent: March 3, 1992
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Yukihiro Yoshikawa, Tooru Hihara, Kunihiro Yamada, Shinji Takenaka, Kazunori Kawahara, Jun Kitagawa