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Casing shoes and methods of reverse-circulation cementing of...

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Casing shoes and methods of reverse-circulation cementing of...

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Casing shut-in valve system

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Casing valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Catcher sub

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Cement control ring

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Cementing tool with protective sleeve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Choke valve assembly for downhole flow control

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
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Closure mechanism with integrated actuator for subsurface...

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
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Constant bottom contact tool

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Control apparatus for oil well production string closing tool

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Curved flapper and seat for a subsurface saftey valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
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Curved flapper valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
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Curved flapper with angle variant seat for a subsurface...

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
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