Expandable earth boring apparatus using impregnated and...

Boring or penetrating the earth – Cutter element laterally shiftable below ground

Reexamination Certificate

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Details

C175S406000, C175S384000, C175S434000

Reexamination Certificate

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07963348

ABSTRACT:
A tool for enlarging a borehole that includes an elongated tubular body; at least one movable arm affixed to the tubular body, the at least one movable arm comprising an outer surface formed of at least one of a matrix material and an abrasive material; and at least one actuating member for expanding at least one movable arm from the collapsed state to an expanded state is disclosed.

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Examination Report under Section 18(3) issued in corresponding United Kingdom Application No. GB0818667.8 dated Feb. 2, 2010.

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