Patents by Inventor Akinori Nishii

Akinori Nishii 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 aerobically treating wastewater and a treatment tank for such method
    Patent number: 6077424
    Abstract: A method for treating liquid-waste utilizing carriers having microorganisms immobilized thereon employs an aerobic treatment tank. At least one underwater agitation type aeration apparatus having an air-diffusing mechanism on a discharge side of an impeller is provided in the treatment tank. While supplying atomized air into the liquid-waste, the carriers and the liquid-waste are circulated through the treatment tank by the underwater agitation type aeration apparatus, to thereby substantially uniformly distribute the carriers in a floating state in the treatment tank. The discharge opening of the underwater agitation type aeration apparatus is provided in the vicinity of a bottom surface of the treatment tank or at an intermediate position with respect to the depth of liquid in the treatment tank.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: June 20, 2000
    Assignee: Ebara Corporation
    Inventors: Noboru Katsukura, Takehiko Yamada, Koji Mishima, Akinori Nishii, Sota Nakagawa, Eiji Tochikubo