Patents by Inventor Shigehisa Iwai

Shigehisa Iwai 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 improving bottom and water quality in water areas and a set of agents used in the method
    Patent number: 5387343
    Abstract: A method for improving the quality of bottom and water in water areas where sludge is deposited on the bottom. In a sample water area, lime, activated sludge and anaerobic sludge, diatomaceous earth or zeolite, and photosynthesis bacteria solution are spread. Before spreading, the photosynthesis bacteria solution is infiltrated into at least either one of the activated sludge and anaerobic sludge, and the diatomaceous earth or zeolite. For the above method, four kinds of the above agents are prepared in a predetermined proportion, and they are separately packed.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: February 7, 1995
    Assignee: Biochem Industrial Ltd.
    Inventors: Shigehisa Iwai, Michiharu Kobayashi, Chihiro Uchida, Koji Kuroda, Shigeru Toda