Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Reexamination Certificate
2008-06-17
2009-10-06
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
C175S053000, C175S263000, C175S265000, C175S271000, C175S284000
Reexamination Certificate
active
07597158
ABSTRACT:
An expandable drilling apparatus is deployed upon a distal end of a drillstring and includes a cutting head and a substantially tubular main body adjacent the cutting head providing a plurality of axial recesses configured to receive arm assemblies configured to translate between a retracted and an extended position. A flow switch actuates the arm assemblies when a drilling fluid pressure exceeds an activation value and the drilling apparatus includes a biasing member to reset the arm assemblies when the drilling fluid pressure falls below a reset value.
REFERENCES:
patent: 6289999 (2001-09-01), Dewey et al.
patent: 2004/0206549 (2004-10-01), Dewey et al.
patent: 2004/0222022 (2004-11-01), Nevlud et al.
patent: 2006/0283636 (2006-12-01), Reagan
patent: 2007/0007043 (2007-01-01), Dewey et al.
Office Action dated Sep. 24, 2008 issued by the PTO in U.S. Appl. No. 11/669,593, 12 pages.
Office Action dated Jul. 7, 2008 issued by the Canadian Intellectual Property Office in Application No. 2,573,891, 3 pages.
Office Action dated Jun. 16, 2009 issued by the Canadian Intellectual Property Office in Application No. 2,573,891, 2 pages.
Campbell John E.
Dewey Charles H.
Schmidt Ronald G.
Underwood Lance D.
Gay Jennifer H
Harcourt Brad
Osha • Liang LLP
Smith International Inc.
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