LandOfFree - US Patents - Listing for Wells,Valves, closures or changeable restrictors,Fluid operated

Wells – Valves – closures or changeable restrictors – Fluid operated

Deep well safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Deep well safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Deep-set annulus vent valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Deepwater drill string shut-off

Wells – Valves – closures or changeable restrictors – Fluid operated

Dewaxing valve for use in oil wells

Wells – Valves – closures or changeable restrictors – Fluid operated

Differential pressure operated circulating and deflation valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Distortion compensation for rod piston bore in subsurface...

Wells – Valves – closures or changeable restrictors – Fluid operated

Double bellows gas lift valve “faustoval”

Wells – Valves – closures or changeable restrictors – Fluid operated

Double seated well valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Down hole bypass valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole actuating apparatus and method

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole actuating apparatus and method

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole apparatus

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole bypass valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole flow control apparatus, operable via surface...

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole flow control apparatus, operable via surface...

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole flow control tool

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole injection system

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole mixing valve