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

Brian S. Shaw

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Control system for deep set subsurface valves

Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate

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Flapper lock open apparatus

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Subsurface safety valve with closure provided by the flowing...

Wells – Processes – Cementing – plugging or consolidating
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2533826

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