Patent ID: 6899832

Claim:
A method of lining a lateral pipe leading into a main pipe from the main pipe out, comprising providing a resin impregnated lateral lining tube of finite length and open ended having at one end a collar of resin impregnated material with a central opening, the collar at the end of the lateral adapted to extend into the main pipe and contact the interior surface of the main pipe at the location where the lateral meets the main pipe with the opposite end of the lateral lining extending into the lateral, positioning the collar in the main pipe at the entrance to the lateral with the opening in the collar aligned with the lateral; inserting the lateral lining into the lateral pipe using a fluid medium under pressure to evert the liner through the opening in the collar, applying pressure to the lateral lining tube, and applying fluid pressure to the collar on the surface of the main pipe to cure the collar against the main pipe and form a seal at the location where the lateral meets the main pipe as curing of the resin takes place.