Patents by Inventor Takuya Onitsuka

Takuya Onitsuka 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).

  • Water purification treatment apparatus with large pore size filter membrane unit
    Publication number: 20020011438
    Abstract: A water purification treatment apparatus with a large pore size filter membrane unit according to the present invention is arranged in which the filter membrane unit has a pore size ranging from 0.8 &mgr;m to 3.0 &mgr;m in the diameter and the filtered water is passed through the filter membrane unit by means of a difference in the water level between a pre-filtered raw water reservoir and the filter membrane unit for removal of pathogenic organisms.
    Type: Application
    Filed: July 17, 2001
    Publication date: January 31, 2002
    Applicant: Suido Kiko Kaisha., Ltd.
    Inventors: Yoshitsugu Jimbo, Takuya Onitsuka
  • Flocculant for water treatment
    Patent number: 5415808
    Abstract: A flocculant for water treatment containing a highly polymerized silicic acid solution having a high concentration of SiO.sub.2 and an extremely low concentration of alkali metal substance, and a method for producing such flocculant. The silicic acid solution is prepared by treating an aqueous solution of an alkali metal silicate such as water glass to remove alkali metal and allowing the solution to liquefy after once gelling. The flocculant may further contain a water soluble metal salt such as ferric chloride or ferric nitrate.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: May 16, 1995
    Assignee: Suido Kiko Kabushiki Kaisha
    Inventors: Takao Hasegawa, Takuya Onitsuka, Yasuhiro Ehara, Katsuhiro Hashimoto, Hiroshi Akazawa
  • Method for producing flocculant for water treatment
    Patent number: 5227089
    Abstract: A flocculant for water treatment containing a highly polymerized silicic acid solution having a high concentration of SiO.sub.2 and an extremely low concentration of alkali metal substance, and a method for producing such flocculant. The silicic acid solution is prepared by treating an aqueous solution of an alkali metal silicate such as water glass to remove alkali metal and allowing the solution to liquefy after once gelling. The flocculant may further contain a water soluble metal salt such as ferric chloride or ferric nitrate.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: July 13, 1993
    Assignee: Suido Kiko Kabushiki Kaisha
    Inventors: Takao Hasegawa, Takuya Onitsuka, Yasuhiro Ehara, Katsuhiro Hashimoto, Hiroshi Akazawa
  • Method and flocculant for water treatment
    Patent number: 4923629
    Abstract: A method and flocculant for water treatment in which the highly polymerized silicic acid and a water-soluble salt of a metal capable of forming a hydroxide in water such as aluminum are added to the water to be treated. The highly polymerized silicic acid can be prepared by polymerizing water glass. In the case where the highly polymerized silicic acid and the water-soluble metal salt are prepared as a flocculant in the form of aqueous solution before adding to the water to be treated, the flocculant is maintained at a pH value of not less than about 2 or not lower than about 11. The flocculant may be a silicic acid solution of which the gel time is prolonged by being added with a substance capable to generate ferrice ion in the solution so that the flocculant can maintain high aggregation ability after being stored for a long time. The silicic acid solution may be polymerized before being added with such ferric ion generating substance.
    Type: Grant
    Filed: May 6, 1988
    Date of Patent: May 8, 1990
    Assignee: Suido Kiko Kabushiki Kaisha
    Inventors: Takao Hasegawa, Takuya Onitsuka, Minoru Suzuki, Yasuhiro Ehara, Katsuhiro Hashimoto, Tadamasa Ozaki