Patents by Inventor Fumihiko Ishizuka

Fumihiko Ishizuka 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 oxidizing malodorous sulfur compounds in kraft cooking liquor
    Patent number: 4242177
    Abstract: A method for oxidizing and removing remaining sodium sulfide as well as generated sulfur compounds by introducing oxygen into cooking liquor at high temperature and high pressure in the end stage of kraft cooking.
    Type: Grant
    Filed: August 9, 1978
    Date of Patent: December 30, 1980
    Assignees: Mitsubishi Paper Mills, Ltd., Mitsubishi Heavy Industries, Ltd.
    Inventors: Masayuki Suzuki, Nobuo Onuma, Fumihiko Ishizuka, Shinichi Hara, Akira Osawa, Akira Fukuzawa