4. Wells
  5. Valves, closures or changeable restrictors
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Redundant hydraulic system for safety valve

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

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Relievable check valve assembly for oil wells and water wells

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

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Remotely operable top drive system safety valve having dual...

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

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Removable injection or production flow equalization valve

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

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Rod operated rotary well valve

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

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