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Class Information
Number: 166/332.8
Name: Wells > Valves, closures or changeable restrictors > Longitudinally movable operator > Flapper type
Description: Longitudinally moveable operator wherein the flow regulating device comprises a hinged plate allowing flow in one direction.










Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
7314091 Cement-through, tubing retrievable safety valve Jan. 1, 2008
7299880 Surge reduction bypass valve Nov. 27, 2007
7287596 Method and apparatus for stimulating hydrocarbon wells Oct. 30, 2007
7270191 Flapper opening mechanism Sep. 18, 2007
7267177 Tubing fill and testing valve Sep. 11, 2007
7255173 Instrumentation for a downhole deployment valve Aug. 14, 2007
7255174 Cement control ring Aug. 14, 2007
7255178 Drillable bridge plug Aug. 14, 2007
7252153 Bi-directional fluid loss device and method Aug. 7, 2007
7246668 Pressure actuated tubing safety valve Jul. 24, 2007
7231971 Downhole safety valve assembly having sensing capabilities Jun. 19, 2007
7231986 Well tool protection system and method Jun. 19, 2007
7213653 Deep set safety valve May. 8, 2007
7204313 Equalizing flapper for high slam rate applications Apr. 17, 2007
7178599 Subsurface safety valve Feb. 20, 2007
7178600 Apparatus and methods for utilizing a downhole deployment valve Feb. 20, 2007
7168492 Wellbore annulus flushing valve Jan. 30, 2007
7152688 Positioning tool with valved fluid diversion path and method Dec. 26, 2006
7063156 Tubing fill and testing valve Jun. 20, 2006
7021386 Safety valve having extension spring closure mechanism Apr. 4, 2006
6991040 Method and apparatus for locking out a subsurface safety valve Jan. 31, 2006
6988556 Deep set safety valve Jan. 24, 2006
6957703 Closure mechanism with integrated actuator for subsurface valves Oct. 25, 2005
6920930 Drop ball catcher apparatus Jul. 26, 2005
6902006 Lock open and control system access apparatus and method for a downhole safety valve Jun. 7, 2005
6892816 Method and apparatus for selective injection or flow control with through-tubing operation capacity May. 17, 2005
6877564 Flapper closure mechanism Apr. 12, 2005
6854519 Subsurface valve with system and method for sealing Feb. 15, 2005
6851477 Curved flapper with angle variant seat for a subsurface safety valve Feb. 8, 2005
6848509 Pressure equalizing plunger valve for downhole use Feb. 1, 2005
6808023 Disconnect check valve mechanism for coiled tubing Oct. 26, 2004
6808020 Debris-free valve apparatus and method of use Oct. 26, 2004
6799633 Dockable direct mechanical actuator for downhole tools and method Oct. 5, 2004
6789623 Method and apparatus for open hole gravel packing Sep. 14, 2004
6772842 Curved flapper valve Aug. 10, 2004
6732803 Debris free valve apparatus May. 11, 2004
6719057 Downhole subsurface safety valve device Apr. 13, 2004
6712145 Float collar Mar. 30, 2004
6705593 Valve closing device Mar. 16, 2004
6684957 Float collar Feb. 3, 2004
6684950 System for pressure testing tubing Feb. 3, 2004
6684958 Flapper lock open apparatus Feb. 3, 2004
6679336 Multi-purpose float equipment and method Jan. 20, 2004
6666271 Curved flapper and seat for a subsurface saftey valve Dec. 23, 2003
6644411 Tubing hanger with flapper valve Nov. 11, 2003
6644408 Equalizing flapper for down hole safety valves Nov. 11, 2003
6631767 Method and apparatus for selective injection or flow control with through-tubing operation capacity Oct. 14, 2003
6629566 Method and apparatus for removing water from well-bore of gas wells to permit efficient production of gas Oct. 7, 2003
6619388 Fail safe surface controlled subsurface safety valve for use in a well Sep. 16, 2003
6607037 Sand control seal for subsurface safety valve Aug. 19, 2003

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