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

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole tool

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole tool actuator

Wells – Valves – closures or changeable restrictors – Fluid operated

Downhole water flow controller for aquifer storage recovery well

Wells – Valves – closures or changeable restrictors – Fluid operated

Drill collar

Wells – Valves – closures or changeable restrictors – Fluid operated

Drill pipe float valve and method of manufacture

Wells – Valves – closures or changeable restrictors – Fluid operated

Drill pipe float valve and method of manufacture

Wells – Valves – closures or changeable restrictors – Fluid operated

Drill pipe tester - pressure balanced

Wells – Valves – closures or changeable restrictors – Fluid operated

Drill stem test tools

Wells – Valves – closures or changeable restrictors – Fluid operated

Drill string safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Drilling tool with an exchangeable feed helix

Wells – Valves – closures or changeable restrictors – Fluid operated

Dual energized hydroseal

Wells – Valves – closures or changeable restrictors – Fluid operated

Dual energized hydroseal

Wells – Valves – closures or changeable restrictors – Fluid operated

Dynamic seal for well tools

Wells – Valves – closures or changeable restrictors – Fluid operated

Eccentric subsurface safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated

Electric-hydraulic power unit

Wells – Valves – closures or changeable restrictors – Fluid operated

Electric-hydraulic power unit

Wells – Valves – closures or changeable restrictors – Fluid operated

Electric-hydraulic power unit

Wells – Valves – closures or changeable restrictors – Fluid operated

Equalizing apparatus for use with wireline-conveyable pumps

Wells – Valves – closures or changeable restrictors – Fluid operated

Equalizing flapper for high slam rate applications