Patents Assigned to Nu-Pipe, Inc.
  • Process for installing a new pipe inside an existing pipeline
    Patent number: 4867921
    Abstract: A thermoplastic pipe in a flattened and folded shape and of selected characteristics is formed by manufacturing it in this reduced shape. It is inserted in the flattened and folded shape and in a pliable state into a pipeline to be lined. It is then expanded and when set serves as a rigid or semi-rigid pipe within a pipeline capable of withstanding external hydrostatic and earth pressures. The thermoplastic pipe is heated during its installation for installing it into an existing pipeline and for expanding it.
    Type: Grant
    Filed: July 28, 1987
    Date of Patent: September 19, 1989
    Assignee: Nu-Pipe, Inc.
    Inventor: Campbell H. Steketee, Jr.