Boring or penetrating the earth – Side wall tool fed laterally without rotation from...
Reexamination Certificate
2008-05-13
2008-05-13
Tsay, Frank (Department: 3676)
Boring or penetrating the earth
Side wall tool fed laterally without rotation from...
C175S378000, C175S341000
Reexamination Certificate
active
11203863
ABSTRACT:
A rolling cone drill bit including multiple cones with regions of intermeshing and non-intermeshing cutter elements. In the non-intermeshed regions, an array of cutter elements is disposed about the cone surface in a non-circumferential arrangement with the cutter elements being mounted at differing radial distances from the bit axis. This non-circumferential arrangement, which may be a spiral, multiple spirals, other patterns of offset cutter elements, or a random arrangement, provides a composite cutting profile having substantial width and bottomhole coverage and is free of ridge-producing voids. In certain embodiments, the composite cutting profiles of the arrays at least partially overlap, and may be arranged to cover a portion of or the entire non-intermeshed region on the cones.
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Combined Search and Examination Report for Appl. No. GB0615906.5 dated Dec. 8, 2006; (5 p.).
Smith International Inc.
Tsay Frank
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