Boring or penetrating the earth – Bit or bit element – Casing shoe type
Reexamination Certificate
2007-05-15
2007-05-15
Gay, Jennifer H. (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Casing shoe type
C175S425000, C166S242800
Reexamination Certificate
active
10168676
ABSTRACT:
A drill bit for drilling casing in a well bore. The drill bit is constructed from a combination of relatively soft and relatively hard materials. The proportions of the materials are selected such that the drill bit provides suitable cutting and boring of the well bore while being able to be drilled through by a subsequent drill bit. Methods of applying hard materials to a soft material body are provided.
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Patterson & Sheridan L.L.P.
Stephenson Daniel P
Weatherford / Lamb, Inc.
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