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

Wells – Valves – closures or changeable restrictors – Fluid operated

Blowout preventer

Wells – Valves – closures or changeable restrictors – Fluid operated

Bottom hole sampler and safety valve and valve therefor

Wells – Valves – closures or changeable restrictors – Fluid operated

Bottom-hole gas-liquid separator

Wells – Valves – closures or changeable restrictors – Fluid operated

By-pass valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Bypass device for wellbores

Wells – Valves – closures or changeable restrictors – Fluid operated

Bypass valve for downhole motor

Wells – Valves – closures or changeable restrictors – Fluid operated

Casing structures having core members under radial compressive f

Wells – Valves – closures or changeable restrictors – Fluid operated

Casing valves system for selective well stimulation and control

Wells – Valves – closures or changeable restrictors – Fluid operated

Chemical injection valve with openable bypass

Wells – Valves – closures or changeable restrictors – Fluid operated

Choke for enhanced gas and oil well production

Wells – Valves – closures or changeable restrictors – Fluid operated

Circulating valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Circulating valve for wells

Wells – Valves – closures or changeable restrictors – Fluid operated

Coiled tubing apparatus

Wells – Valves – closures or changeable restrictors – Fluid operated

Coiled tubing safety valve and assembly

Wells – Valves – closures or changeable restrictors – Fluid operated

Control line hydrostatic minimally sensitive control system

Wells – Valves – closures or changeable restrictors – Fluid operated

Control system communication and lock open tool and method...

Wells – Valves – closures or changeable restrictors – Fluid operated

Control system for deep set subsurface valves

Wells – Valves – closures or changeable restrictors – Fluid operated

Cyclic check valve for coiled tubing

Wells – Valves – closures or changeable restrictors – Fluid operated

Deep set piston actuated well safety valve