Patents Assigned to ECW, Inc.
  • Pipe joint
    Patent number: 4746147
    Abstract: Bell and spigot pipes are joined coaxially with a compressed gasket and are largely surrounded by a layer of insulation. A sleeve surrounds the joint so made and is sealed to the respective pipes and is filled with a foam insulator.
    Type: Grant
    Filed: April 9, 1987
    Date of Patent: May 24, 1988
    Assignee: ECW, Inc.
    Inventor: Grant W. Walker