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| Number | Title | Issue Date |
| 3951173 | Method and apparatus for sealing large diameter pipes An inflatable packer positionable in the interior of pipes for packing a sealant material into a void or joint in the pipe wall. Inflatable outer casings mounted on a support rim are utilized to seal off the area surrounding the void or joint. The support... | 04/20/1976 |
| 3950461 | Pipe repair apparatus and method Disclosed is a method and apparatus for repairing a buried main having connected lateral service conduits. In the method, a main is opened and cleaned of debris. Thereafter, an elongated conduit liner is axially inserted into a length of the buried main. ... | 04/13/1976 |
| 3946125 | Method for internally coating ducts with synthetic resin A method of and an apparatus for the internal coating of ducts with a synthetic resin, especially long steel pipes or tubes, in which gas-entrained synthetic-resin particles are passed through the tube while the latter is heated progressively by displacin... | 03/23/1976 |
| 3933519 | Sub-sea pipe cleaning apparatus and method Apparatus and method for cleaning the exterior surface of a pipe such as a pipe located in a sub-sea location having a coating of concrete or the like thereabout. The apparatus includes a generally longitudinal frame which supports a carriage for longitud... | 01/20/1976 |
