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

David Brunnert

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Annulus pressure control drilling systems and methods

Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Reexamination Certificate

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Apparatus and methods for utilizing a downhole deployment valve

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

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Profile ID: LFUS-PAI-P-3087398

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