Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Reexamination Certificate
2011-03-29
2011-03-29
Mayo-Pinnock, Tara (Department: 3671)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
C173S091000, C175S019000, C405S184000
Reexamination Certificate
active
07914233
ABSTRACT:
A method for installing an underground pipe using a ground piercing tool comprises the steps of: fitting an expander onto a front nose of the tool, securing the pipe to the expander so that the ground piercing tool is disposed inside of the pipe, operating the tool in forward mode over a run to pull the pipe into the ground, removing the ground piercing tool from the expander and pipe by moving it in a rearward direction through the newly installed pipe, and leaving the expander in the ground, preferably to form the front end of the newly installed pipe. It is not required that each of the foregoing steps be conducted in the order recited. For example, the expander could be secured to the pipe after which the expander and pipe could be fitted over the tool.
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Dorsey & Whitney LLP
Harr Technologies LLC
Mayo-Pinnock Tara
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