Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
John E. Campbell0
Ronald G. Schmidt0
Charles H. Dewey0
Lance D. Underwood0
Date of Patent
October 6, 2009
Patent Application Number
12140833
Date Filed
June 17, 2008
Patent Citations Received
Patent Primary Examiner
Patent 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.
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