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

Ronald E. Pringle

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Annular flow control safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Apparatus and method for communicating with devices...

Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate

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Apparatus and method for controlling fluid flow

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Apparatus and method for controlling fluid flow in a wellbore

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate

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Apparatus for remote control of multilateral wells

Wells – Wells with lateral conduits
Patent

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Profile ID: LFUS-PAI-P-8917

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