Patents Assigned to Geodia
  • Process and device for temporarily supporting the walls of a trench
    Patent number: 4806049
    Abstract: In a trench is disposed a closed flexible envelope filled with a fluid having a density or pressure greater than that of the surrounding fluid, movable by itself under the effect of the pressure exerted at its end by said pipe, which envelope is in the form of a cylinder each end of which has been turned in concentrically to its longitudinal axis, in the direction of the opposite end, the two central portions of this turning in being welded together so as to form a central envelope web turned in along its axis.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: February 21, 1989
    Assignee: Geodia
    Inventor: Francis Cour