Patents Assigned to Kazuto Nakazawa, General Director Public Works Research Institute Ministry of Construction
  • Collapsable dam
    Patent number: 4279540
    Abstract: A deformable dam made of an impermeable flexible membrane secured in a water tight manner to the bottom and side walls of a river. The flexible membrane is inflatable using either air or water, or a combination to vary the overall effective length of the dam.
    Type: Grant
    Filed: February 9, 1979
    Date of Patent: July 21, 1981
    Assignees: Kazuto Nakazawa, General Director Public Works Research Institute Ministry of Construction, Sumitomo Electric Industries, Ltd.
    Inventors: Kyozo Suga, Jinya Iizuka, Yoshiomi Tsuji