Assignee
DARNELL WILLIAM JOHN
US·2 granted patents·12 citations·filing 2009–2011
Technology mixE21B2
Top patents by PatentIndex Score
2 records- 0167US8171998B1System for controlling hydrocarbon bearing zones using a selectively openable and closable downhole toolDARNELL WILLIAM JOHN·Filed 2011·Granted May 8, 2012·4 cites·2 claims
- 0262US8141648B2Multiple-positioning mechanical shifting system and methodDARNELL WILLIAM JOHN·Filed 2009·Granted Mar 27, 2012·8 cites·25 claims
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