Inventor
LEISMER DWAYNE D
US21 patents
⚠️ This page may combine multiple inventors who share the name “LEISMER DWAYNE D”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CAMCO INT
13 patentsUS6247536B1Jun 19, 2001
Downhole multiplexer and related methods
CAMCO INT148 citations99
US6296061B1Oct 2, 2001
Pilot-operated pressure-equalizing mechanism for subsurface valve
CAMCO INT86 citations98
US6491102B2Dec 10, 2002
Downhole multiplexer and related methods
CAMCO INT53 citations96
US6237683B1May 29, 2001
Wellbore flow control device
CAMCO INT41 citations96
US5310004AMay 10, 1994
Fail safe gas bias safety valve
CAMCO INT66 citations96
US5167284ADec 1, 1992
Selective hydraulic lock-out well safety valve and method
CAMCO INT65 citations96
US5984006ANov 16, 1999
Emergency release tool
CAMCO INT60 citations95
US6241015B1Jun 5, 2001
Apparatus for remote control of wellbore fluid flow
CAMCO INT43 citations92
US5101897AApr 7, 1992
Slip mechanism for a well tool
CAMCO INT43 citations92
US4976317ADec 11, 1990
Well tool hydrostatic release means
CAMCO INT36 citations92
US5323853AJun 28, 1994
Emergency downhole disconnect tool
CAMCO INT66 citations91
US5348090ASep 20, 1994
Expanded slip well anchor
CAMCO INT17 citations74
US6209649B1Apr 3, 2001
Selective re-entry tool for multiple tubing completions and method of using
CAMCO INT6 citations73
SCHLUMBERGER TECHNOLOGY CORP
7 patentsUS6433991B1Aug 13, 2002
Controlling activation of devices
SCHLUMBERGER TECHNOLOGY CORP130 citations97
US6308783B2Oct 30, 2001
Wellbore flow control device
SCHLUMBERGER TECHNOLOGY CORP56 citations96
US6789627B2Sep 14, 2004
Control line cutting tool and method
SCHLUMBERGER TECHNOLOGY CORP36 citations92
US6732801B2May 11, 2004
Apparatus and method for completing a junction of plural wellbores
SCHLUMBERGER TECHNOLOGY CORP31 citations92
US6712149B2Mar 30, 2004
Apparatus and method for spacing out of offshore wells
SCHLUMBERGER TECHNOLOGY CORP21 citations92
US7543652B2Jun 9, 2009
Subsurface annular safety barrier
SCHLUMBERGER TECHNOLOGY CORP4 citations57
US7140447B2Nov 28, 2006
Subsurface annular safety barrier
SCHLUMBERGER TECHNOLOGY CORP1 citations47