4. Wells
  5. Expansible anchor or casing
  6. Expansible means translated by wedge or cam

John Ravensbergen

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Cyclic check valve for coiled tubing

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

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Mandrel operated torque anchor

Wells – Expansible anchor or casing – Expansible means translated by wedge or cam
Patent

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Method for cleaning gravel packs

Wells – Processes – Cleaning or unloading well
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1350068

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