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

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

Curved flapper valve

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

Curved flapper with angle variant seat for a subsurface...

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

Debris protection for sliding sleeve

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

Downhole apparatus

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

Downhole ball circulation tool

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

Downhole flapper valve

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

Downhole fluid pressure signal generation and transmission

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

Downhole lubricator valve

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

Downhole subsurface safety valve device

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

Downhole tool

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

Downhole tool with ratchet

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

Downhole valve and method of making

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

Drill pipe tester and safety valve

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

Drill pipe tester and safety valve

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

Drill string diverter apparatus and method

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 – Longitudinally movable operator

Equalizing flapper for down hole safety valves

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

Flapper closure mechanism