Patents by Inventor Kingo Chu

Kingo Chu 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 preventing activated sludge from losing its settling ability
    Patent number: 5536410
    Abstract: A method for preventing activated sludge from losing its settling ability, which sometimes happens in solid/liquid separation in an activated sludge treatment of an aqueous organic waste and causes the so-called bulking and scumming of the sludge. This method involves adding either (a) a nonionic and/or an anionic surfactant, (b) a combination of a nonionic surfactant with a cationic surfactant of a form of quaternary ammonium salt or (c) a combination of a nonionic surfactant and a cationic surfactant of a form of a quaternary ammonium salt with a cationic organic flocculant, to the activated sludge treatment system.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: July 16, 1996
    Assignee: Kurita Water Industries Ltd.
    Inventors: Katsura Kitatsuji, Tetsuro Fukase, Kingo Chu