4. Measuring and testing
  5. Borehole or drilling
  6. Pressure measurement

Fredrick D. Curtis

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Hydraulically operated formation isolation valve for...

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

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Measurements of properties and transmission of measurements...

Measuring and testing – Borehole or drilling – Pressure measurement
Reexamination Certificate

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Underbalanced well completion

Boring or penetrating the earth – Tool removable or insertable through or around driving or...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2675383

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