4. Communications, electrical: acoustic wave systems and devices
  5. Wellbore telemetering
  6. Through well fluids
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Self-adjusting valve actuator

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Semi-passive two way borehole communication apparatus and...

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Reexamination Certificate

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Servo valve for well-logging telemetry

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Servo-driven mud pulser

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Signal pressure pulse generator

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Signal pressure pulse generator

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Signal transmitters

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Sinusoidal pressure pulse generator for measurement while drilli

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Snap action rotary pulser

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Stepper motor driven negative pressure pulse generator

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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System and methods of communicating over noisy communication...

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Reexamination Certificate

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Systems, apparatus and methods for measuring while drilling

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Systems, apparatus and methods for measuring while drilling

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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