Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 9, 2008
Patent Application Number
11691151
Date Filed
March 26, 2007
Patent Primary Examiner
Patent abstract
A drilling apparatus includes a cutting structure defined by a percussive action cutter and at least one other cutter. The percussive action cutter is adapted to be urged in a drilling direction by hydraulic pressure force, while the other cutter is urged in a drilling direction by mechanical force.
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