Patents by Inventor Takusaburo Ohnishi

Takusaburo Ohnishi 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 treating muddy water
    Patent number: 5034137
    Abstract: A method for treating muddy water which comprises adding a first chemical containing an alkali metal or alkaline earth metal oxide or hydroxide to muddy water to be treated, thereby rendering muddy water alkaline, adding a second chemical containing an anionic polymer coagulant to muddy water simultaneously with or after the addition of the chemical, further adding a third chemical containing a sulfate thereby rendering the muddy water weakly alkaline, and then adding a fourth chemical containing an anionic polymer coagulant to muddy water. As a result, large-sized and hard flocs are produced.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: July 23, 1991
    Assignee: Kabushiki Kaisha Iseki Kaihatsu Koki
    Inventors: Sohei Okamoto, Jiro Hirano, Takusaburo Ohnishi