Patents Assigned to Groundtech, Inc.
  • Underground work chamber assembly and method for the construction thereof
    Patent number: 5302052
    Abstract: An underground work chamber assembly including a chamber, elevator shaft, air path, utility path, and slotted grout pipes which is assembled as lowered into a drilled hole on dry land or underwater, the slotted grout pipes facilitating a controlled grouting of the space surrounding the underground work chamber assembly when in place.
    Type: Grant
    Filed: April 16, 1993
    Date of Patent: April 12, 1994
    Assignee: Groundtech, Inc.
    Inventors: Agust Agustsson, Richard A. Wallers, Tomas H. Agustsson