Patents by Inventor Akira Iimura

Akira Iimura 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).

  • Bactericidal/algicidal method
    Patent number: 10421676
    Abstract: The invention provides a bactericidal/algicidal method including adding an oxidant-based bactericidal/algicidal agent and a stabilizer therefor to a target water system, characterized in that the amount of combined chlorine or the stabilizer in the water system is controlled by generating free residual chlorine in the water system, and a bactericidal/algicidal method including adding an oxidant-based bactericidal/algicidal agent and a stabilizer therefor to a target water system, characterized in that the amount of the oxidant-based bactericidal/algicidal agent added is controlled so that the concentration of total residual chlorine in the water system falls within a predetermined range, and the amount of combined chlorine or the stabilizer is controlled so that the concentration of free residual chlorine in the water system falls within a predetermined range.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: September 24, 2019
    Assignee: KURITA WATER INDUSTRIES LTD.
    Inventors: Yutaka Yoneda, Hideo Otaka, Kouichi Tanaka, Kazuhiko Tsunoda, Naohiro Nagai, Akira Iimura
  • BACTERICIDAL/ALGICIDAL METHOD
    Publication number: 20100240535
    Abstract: The invention provides a bactericidal/algicidal method including adding an oxidant-based bactericidal/algicidal agent and a stabilizer therefor to a target water system, characterized in that the amount of combined chlorine or the stabilizer in the water system is controlled by generating free residual chlorine in the water system, and a bactericidal/algicidal method including adding an oxidant-based bactericidal/algicidal agent and a stabilizer therefor to a target water system, characterized in that the amount of the oxidant-based bactericidal/algicidal agent added is controlled so that the concentration of total residual chlorine in the water system falls within a predetermined range, and the amount of combined chlorine or the stabilizer is controlled so that the concentration of free residual chlorine in the water system falls within a predetermined range.
    Type: Application
    Filed: September 10, 2008
    Publication date: September 23, 2010
    Applicant: Kurita Water Industries Ltd
    Inventors: Yutaka Yoneda, Hideo Otaka, Kouichi Tanaka, Kazuhiko Tsunoda, Naohiro Nagai, Akira Iimura
  • Scale inhibition agent and method for using same
    Patent number: 6162391
    Abstract: An agent for preventing scale formation and a method for preventing scale formation include a polymer which has at least 50% of N-vinyl formamide units or N-vinyl acetamide units and a phosphorus compound added to water in a cooling water system, a boiler water system, or the like. The scale preventing agent and scale preventing method of the present invention are effective in preventing the adherence of various types of scales which are generated in cooling water systems, boiler water systems, and the like. In particular, the present invention is effective in preventing the adherence of silica and calcium scale.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: December 19, 2000
    Assignee: Kurita Water Industries Ltd.
    Inventors: Kenji Kowata, Akira Iimura, Shigeru Sato, Urara Usui, Aya Sakaguchi