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

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

Downhole surge tools

Wells – Valves – closures or changeable restrictors – Rotated operator

Downhole tester valve with resilient seals

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

Downhole tool

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 – Longitudinally movable operator

Downhole tool with ratchet

Wells – Valves – closures or changeable restrictors – Rotated operator

Downhole valve

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

Downhole valve and method of making

Wells – Valves – closures or changeable restrictors

Downhole valve which may be installed or removed by a wireline r

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 – 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 – Fluid operated

Drill stem test tools

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

Drill string diverter apparatus and method

Wells – Valves – closures or changeable restrictors – Fluid operated

Drill string safety valve