Boring or penetrating the earth – Cutter element laterally shiftable below ground
Reexamination Certificate
2011-06-07
2011-06-07
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
C175S284000, C175S384000, C175S406000
Reexamination Certificate
active
07954564
ABSTRACT:
A secondary cutting structure for sure in a drilling assembly, the secondary cutting structure including a tubular body and a block, extendable from the tubular body, the block including a first arrangement of cutting elements disposed on a first blade and a second arrangement of cutting elements disposed on a second blade, wherein the second arrangement is a modified redundant arrangement. Also, a secondary cutting structure for use in a drilling assembly, the secondary cutting structure including a leading blade disposed on a first block and a trailing blade disposed on the first block adjacent the leading blade. Additionally, the secondary cutting structure includes a unique blade disposed on a second block, wherein a gage portion of at least one of the blades has a length between 30% and 45% of a total blade length.
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Search Report for related United Kingdom Application No. GB0912314.2 dated Oct. 12, 2009. (5 pages).
Laird Tommy
Makkar Navish
Nelson Gail
Tang Wei
Whipple Gordon
Osha & Liang LLP
Smith International Inc.
Thompson Kenneth
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