4. Measuring and testing
  5. Borehole or drilling
  6. Downhole test

John D. Macpherson

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Distributed sensors-controller for active vibration damping...

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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Method for acoustic signal transmission in a drill string

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Reexamination Certificate

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Methods for analysis of drillstring vibration using torsionally

Measuring and testing – Borehole or drilling – Downhole test
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Real-time drilling optimization based on MWD dynamic...

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

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System and method for improved depth measurement correction

Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1902444

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