Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Reexamination Certificate
2007-07-10
2007-07-10
Lagman, Frederick L. (Department: 3673)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
C405S184100, C138S097000
Reexamination Certificate
active
11452530
ABSTRACT:
A method for reinforcing or repairing a pipe pulls a liner assembly with a flexible smooth bore liner and a semi-rigid helix that gives non-collapsible characteristics within the damaged pipe for both linear pipe sections and curved pipe sections. The existing pipe is first cleaned with a specially designed brush with two wooden spheres at each end of the brush to prevent snagging or jamming during brush operations. The liner assembly is then pulled through the total length of the pipe and anchored at each end with retaining sleeves, which are sandwiched and glued within the liner assembly and the inside diameter of the existing pipe.
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patent: 5241993 (1993-09-01), Stephens
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patent: 5427154 (1995-06-01), Stephens
patent: 6062264 (2000-05-01), Dickson
patent: 7137757 (2006-11-01), Cosban
patent: 2088516 (1982-06-01), None
Lagman Frederick L.
Perrone Jr. Mathew R P
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