4. Communications, electrical: acoustic wave systems and devices
  5. Wellbore telemetering
  6. Through well fluids
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Reciprocating pulser for mud pulse telemetry

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

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Rotary acting shear valve for drilling fluid telemetry systems

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

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Rotational pulsation system and method for communicating

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

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