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

Michael B. Vinzant

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Dual flapper safety valve

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

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Equalizing means for well tools

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

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Safety system

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

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Subsurface safety valve

Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent

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Surface controlled subsurface safety valve

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

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Profile ID: LFUS-PAI-P-204962

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