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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
7954545 Plunger lift system for well Jun. 7, 2011
7896082 Methods and apparatus for negating mineral scale buildup in flapper valves Mar. 1, 2011
7891428 Safety valve Feb. 22, 2011
7866401 Safety valve for use in an injection well Jan. 11, 2011
7861790 Injection valve and method Jan. 4, 2011
7861786 Method and apparatus for fluid bypass of a well tool Jan. 4, 2011
7798229 Dual flapper safety valve Sep. 21, 2010
7798235 Safety valve torsional spring assembly and method Sep. 21, 2010
7789156 Flapper valve for use in downhole applications Sep. 7, 2010
7779919 Flapper valve retention method and system Aug. 24, 2010
7775291 Retrievable surface controlled subsurface safety valve Aug. 17, 2010
7743833 Pressure balanced piston for subsurface safety valves Jun. 29, 2010
7717185 Lock open and control system access apparatus for a downhole safety valve May. 18, 2010
7708066 Full bore valve for downhole use May. 4, 2010
7703532 Tubing retrievable injection valve Apr. 27, 2010
7690432 Apparatus and methods for utilizing a downhole deployment valve Apr. 6, 2010
7673689 Dual flapper barrier valve Mar. 9, 2010
7665536 System and method for preventing cross-flow between formations of a well Feb. 23, 2010
7654333 Downhole safety valve Feb. 2, 2010
7644767 Safety valve with flapper/flow tube friction reducer Jan. 12, 2010
7640989 Electrically operated well tools Jan. 5, 2010
7624792 Shear activated safety valve system Dec. 1, 2009
7624807 Deep set safety valve Dec. 1, 2009
7624809 Method and apparatus for stimulating hydrocarbon wells Dec. 1, 2009
7621336 Casing shoes and methods of reverse-circulation cementing of casing Nov. 24, 2009
7621337 Casing shoes and methods of reverse-circulation cementing of casing Nov. 24, 2009
7614452 Flow reversing apparatus and methods of use Nov. 10, 2009
7604056 Downhole valve and method of making Oct. 20, 2009
7600534 Valve closing device Oct. 13, 2009
7600572 Drillable bridge plug Oct. 13, 2009
7597149 Safety valve with extension springs Oct. 6, 2009
7543651 Non-elastomer cement through tubing retrievable safety valve Jun. 9, 2009
7537062 Flapper valve and actuator May. 26, 2009
7533729 Reverse cementing float equipment May. 19, 2009
7530401 Tool trap assembly and method May. 12, 2009
7510010 System and method for cementing through a safety valve Mar. 31, 2009
7487829 Wellbore valve having linear magnetically geared valve actuator Feb. 10, 2009
7464763 Method of injecting lift gas and gas lift flow control device Dec. 16, 2008
7455116 Injection valve and method Nov. 25, 2008
7451809 Apparatus and methods for utilizing a downhole deployment valve Nov. 18, 2008
7431093 Protection scheme and method for deployment of artificial lift devices in a wellbore Oct. 7, 2008
7409996 Control system communication and lock open tool and method for locking open a safety valve and communicating with surface Aug. 12, 2008
7404446 Well tool protection system and method Jul. 29, 2008
7392849 Balance line safety valve with tubing pressure assist Jul. 1, 2008
7363980 Downhole flow control apparatus, operable via surface applied pressure Apr. 29, 2008
7360600 Subsurface safety valves and methods of use Apr. 22, 2008
7360602 Barrier orifice valve for gas lift Apr. 22, 2008
7357181 Apparatus for autofill deactivation of float equipment and method of reverse cementing Apr. 15, 2008
7350590 Instrumentation for a downhole deployment valve Apr. 1, 2008
7347270 Redundant hydraulic system for safety valve Mar. 25, 2008

1 2 3 4 5










 
 
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