4. Wells
  5. Valves, closures or changeable restrictors
  6. Fluid operated

Roland O. Cox

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Ball valve structure

Valves and valve actuation – With means to increase head and seat contact pressure – Separate actuators or actuator motion
Patent

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Bleedoff tool for well test system

Wells – Submerged well – Testing
Patent

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Bleedoff tool for well test system

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Catcher sub

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

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Coil spring supported sealing element and device

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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Profile ID: LFUS-PAI-P-7609

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