Assignee
SUNSTONE CORP
US11 patents
Top patents by PatentIndex Score
US6666274B2Dec 23, 2003
Tubing containing electrical wiring insert
SUNSTONE CORP155 citations98
US7468173B2Dec 23, 2008
Method for producing nitrogen to use in under balanced drilling, secondary recovery production operations and pipeline maintenance
SUNSTONE CORP68 citations95
US7380590B2Jun 3, 2008
Rotating pressure control head
SUNSTONE CORP56 citations95
US7537062B2May 26, 2009
Flapper valve and actuator
SUNSTONE CORP35 citations92
US7226090B2Jun 5, 2007
Rod and tubing joint of multiple orientations containing electrical wiring
SUNSTONE CORP38 citations92
US8028750B2Oct 4, 2011
Force balanced rotating pressure control device
SUNSTONE CORP21 citations90
US6769498B2Aug 3, 2004
Method and apparatus for inducing under balanced drilling conditions using an injection tool attached to a concentric string of casing
SUNSTONE CORP29 citations90
US6877571B2Apr 12, 2005
Down hole drilling assembly with independent jet pump
SUNSTONE CORP18 citations89
US6899188B2May 31, 2005
Down hole drilling assembly with concentric casing actuated jet pump
SUNSTONE CORP16 citations80
US7137945B2Nov 21, 2006
Underground treatment of biowaste
SUNSTONE CORP7 citations71
US7981379B2Jul 19, 2011
Producing nitrogen to use in under balanced drilling, secondary recovery production operations and pipeline maintenance
SUNSTONE CORP2 citations60