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

Wells – Valves – closures or changeable restrictors – Fluid operated

Low pressure responsive tester valve with ratchet

Wells – Valves – closures or changeable restrictors – Fluid operated

Low pressure responsive tester valve with spring retaining means

Wells – Valves – closures or changeable restrictors

Low well yield control system and method

Wells – Valves – closures or changeable restrictors – Fluid operated

Lubricator valve apparatus

Wells – Valves – closures or changeable restrictors – Fluid operated

Mechanical lockout for pressure responsive downhole tool

Wells – Valves – closures or changeable restrictors – Rotated operator

Mechanically actuated subsurface injection tool

Wells – Valves – closures or changeable restrictors

Mechanically opened ball seat and expandable ball seat

Wells – Valves – closures or changeable restrictors

Mechanically set liner hanger and running tool

Wells – Valves – closures or changeable restrictors – Fluid operated

Metal-to-metal high/low pressure seal

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

Metal-to-metal non-elastomeric seal stack

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

Metal-to-metal sliding side door for wells

Wells – Valves – closures or changeable restrictors

Method and apparatus for a surface control system for: subsurfac

Wells – Valves – closures or changeable restrictors

Method and apparatus for artificial lift from multiple productio

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for catching a pump-down plug or ball

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

Method and apparatus for cementing a well

Wells – Valves – closures or changeable restrictors

Method and apparatus for connecting steel pipe sections

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for continuously injecting fluid in a...

Wells – Valves – closures or changeable restrictors – Rotated operator

Method and apparatus for controlling the injection profile of a

Wells – Valves – closures or changeable restrictors – Fluid operated

Method and apparatus for controlling well pressure in...