Patents Assigned to Gundle Lining Systems, Inc.
  • Method of sealing lateral connections for pipe liners
    Patent number: 5223189
    Abstract: The invention provides an apparatus and method by which an opening into a lateral pipe connection for a pipeline into which a liner is being installed may be sealed and protectively lined. The invention features a bushing which is emplaced in the lateral connection by use of an expandable mandrel and a control means. The bushing includes an integral heating element for softening the thermoplastic material from which the bushing is formed. O-rings are positioned between the bushing and the lateral pipe to form a seal.
    Type: Grant
    Filed: January 7, 1992
    Date of Patent: June 29, 1993
    Assignee: Gundle Lining Systems, Inc.
    Inventor: Struve Friedrich