Patents by Inventor Hirofumi Izumikawa

Hirofumi Izumikawa 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 decomposing dioxins
    Patent number: 6291737
    Abstract: A method for decomposing and eliminating dioxins contained in flyash at a lower temperature and in a shorter time is provided, in which dioxides or dioxins-containing materials are brought into contact with amine compounds and/or ammonium compounds at a temperature lower than 300 ° C. Chlorine in dioxines reacts with amine compounds and/or ammonium compounds and thus the dechlorination or replacement reaction of dioxin quickly proceeds under lower temperature. The method makes it possible to decompose dioxins under low temperature range in which dioxins have been thought to be undecomposable.
    Type: Grant
    Filed: December 30, 1999
    Date of Patent: September 18, 2001
    Assignee: Kurita Water Industries Ltd.
    Inventors: Hiroshi Miyata, Naoaki Fujiyoshi, Hirofumi Izumikawa, Mitsuhiro Mashiko, Noboru Fujiwara
  • Method of decomposing dioxins
    Patent number: 6063979
    Abstract: A method for decomposing and eliminating dioxins contained in flyash at a lower temperature and in a shorter time is provided, in which dioxins or dioxins-containing materials are brought into contact with amine compounds and/or ammonium compounds at a temperature lower than 300.degree. C. Chlorine in dioxins reacts with amine compounds and/or ammonium compounds and thus the dechlorination or replacement reaction of dioxin quickly proceeds under lower temperature. The method makes it possible to decompose dioxins under low temperature range in which dioxins have been thought to be undecomposable.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: May 16, 2000
    Assignee: Kurita Water Industries Ltd.
    Inventors: Hiroshi Miyata, Naoaki Fujiyoshi, Hirofumi Izumikawa, Mitsuhiro Mashiko, Noboru Fujiwara