Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – With protection or indication of pipe or trench
Reexamination Certificate
2006-02-21
2006-02-21
Lagman, Frederick L. (Department: 3673)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
With protection or indication of pipe or trench
C405S156000, C405S184100
Reexamination Certificate
active
07001106
ABSTRACT:
A system for installing warning units in a buried pipeline. A small hole is drilled in the ground to the pipeline. A collar is affixed to one of the pipes of the pipeline. A valve with an internal passage is connected to the collar. A hole is drilled in the pipe. A warning unit is installed in the pipe by moving the warning unit through the internal passage, the collar, and the hole in the pipe.
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Burnham Alan K.
Cooper John F.
Lagman Frederick L.
Scott Eddie E.
The Regents of the University of California
Thompson Alan H.
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