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

Wells – Valves – closures or changeable restrictors – Fluid operated

Drilling tool with an exchangeable feed helix

Wells – Valves – closures or changeable restrictors – Operated by dropped element

Drop ball catcher apparatus

Wells – Valves – closures or changeable restrictors – Destructible element

Drop ball sub-assembly for a down-hole device

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 – Longitudinally movable operator

Dual flapper safety valve

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

Dual metal seal for a well safety valve

Wells – Valves – closures or changeable restrictors – Destructible element

Dump valve assembly for selective draining of liquid from an...

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

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

Electric-hydraulic power unit

Wells – Valves – closures or changeable restrictors

Enhanced recovery with geopressured water resource

Wells – Valves – closures or changeable restrictors – Fluid operated

Equalizing apparatus for use with wireline-conveyable pumps

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

Equalizing flapper for down hole safety valves

Wells – Valves – closures or changeable restrictors – Fluid operated

Equalizing flapper for high slam rate applications

Wells – Valves – closures or changeable restrictors – Fluid operated

Equalizing means for a subsurface well safety valve