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DOUBLE E INC

US12 patents

Top patents by PatentIndex Score

US4907650AMar 13, 1990

Wellhead with safety valve for pumping well

DOUBLE E INC62 citations94

US4844406AJul 4, 1989

Blowout preventer

DOUBLE E INC46 citations92

US6223819B1May 1, 2001

Wellhead for providing structure when utilizing a well pumping system

DOUBLE E INC50 citations90

US5044602ASep 3, 1991

Blowout preventer

DOUBLE E INC41 citations90

US5246067ASep 21, 1993

Well leak catcher

DOUBLE E INC36 citations88

US5435385AJul 25, 1995

Integrated wellhead tubing string

DOUBLE E INC7 citations74

US4289294ASep 15, 1981

Wellhead flow control devices

DOUBLE E INC28 citations74

US5878812AMar 9, 1999

Misaligning wellhead system

DOUBLE E INC16 citations73

US4286791ASep 1, 1981

Packing assembly for a movable shaft

DOUBLE E INC7 citations65

US4632468ADec 30, 1986

Guide for well pump sucker rod

DOUBLE E INC4 citations62

US7363985B2Apr 29, 2008

Hydraulic latch for capillary tubing string

DOUBLE E INC4 citations61

US6955225B2Oct 18, 2005

Method of and apparatus for securing capillary tubing in a wellhead

DOUBLE E INC0 citations50