4. Wells
  5. Processes
  6. Operating valve, closure, or changeable restrictor in a well

Bernard Doremus

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Locking device for securing a tool in a well conduit

Wells – Expansible anchor or casing – Spring set
Patent

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Plug valve equipped with pressure equalization means

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

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Pulling and running tool

Handling: hand and hoist-line implements – Grapple – Well type
Patent

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Remote hydraulic control method and apparatus, notably for under

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

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Safety valve in particular for closing an oil well

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

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Profile ID: LFUS-PAI-P-197936

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