Inventor
JOHNSTON RUSSELL A
US16 patents
⚠️ This page may combine multiple inventors who share the name “JOHNSTON RUSSELL A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CAMCO INC
5 patentsUS4616704AOct 14, 1986
Control line protector for use on a well tubular member
CAMCO INC17 citations73
US4541482ASep 17, 1985
Offset open bore sidepocket mandrel
CAMCO INC10 citations73
US4538681ASep 3, 1985
Soft set and pull latch and setting tool for a well measuring instrument
CAMCO INC8 citations73
US4498533AFeb 12, 1985
Keyhole mandrel with insert pocket
CAMCO INC12 citations73
US4651822AMar 24, 1987
Dump and kill valve for a sidepocket mandrel
CAMCO INC12 citations71
CAMCO INT
4 patentsUS6079497AJun 27, 2000
Pressure equalizing safety valve for subterranean wells
CAMCO INT67 citations96
US5598864AFeb 4, 1997
Subsurface safety valve
CAMCO INT54 citations94
US5190106AMar 2, 1993
Well injection valve retrievable choke
CAMCO INT30 citations92
US5975212ANov 2, 1999
Surface controlled subsurface safety valve downstop seal
CAMCO INT13 citations73
OTIS ENG CO
4 patentsUS4399871AAug 23, 1983
Chemical injection valve with openable bypass
OTIS ENG CO123 citations94
US4407364AOct 4, 1983
Landing nipple for pumpdown well completion system
OTIS ENG CO16 citations73
US4142597AMar 6, 1979
Mechanical detent jars
OTIS ENG CO11 citations73
US4119147AOct 10, 1978
Pumpdown safety valve
OTIS ENG CO3 citations62
SCHLUMBERGER TECHNOLOGY CORP
3 patentsUS6973970B2Dec 13, 2005
Apparatus and methods for establishing secondary hydraulics in a downhole tool
SCHLUMBERGER TECHNOLOGY CORP72 citations96
US7740075B2Jun 22, 2010
Pressure relief actuated valves
SCHLUMBERGER TECHNOLOGY CORP2 citations58
US7621331B2Nov 24, 2009
Fluid communication nipple having an interior passageway with an interior wall section that may be opened to establish fluid communication with the passageway
SCHLUMBERGER TECHNOLOGY CORP1 citations45