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

Wells – Valves – closures or changeable restrictors – Fluid operated

Deep set piston actuated well safety valve

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 – Destructible element

Delayed opening ball seat

Wells – Valves – closures or changeable restrictors

Device for an opening in an outer sleeve of a sleeve valve...

Wells – Valves – closures or changeable restrictors – Fluid operated

Dewaxing valve for use in oil wells

Wells – Valves – closures or changeable restrictors – Destructible element

Differential fill valve assembly

Wells – Valves – closures or changeable restrictors – Fluid operated

Differential pressure operated circulating and deflation valve

Wells – Valves – closures or changeable restrictors – Destructible element

Differential valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Distortion compensation for rod piston bore in subsurface...

Wells – Valves – closures or changeable restrictors

Distributed load liner hanger and method of use thereof

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

Down hold packing gland and method for long stroke pumper

Wells – Valves – closures or changeable restrictors – Fluid operated

Down hole bypass valve

Wells – Valves – closures or changeable restrictors

Down-hole decelerators

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole actuating apparatus and method