4. Communications: electrical
  5. Wellbore telemetering or control
  6. Modification of signal bandwidth, frequency, or circuit...
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Acoustic telemetry transceiver

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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Acoustic telemetry transceiver

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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Downhole data transmission apparatus and methods

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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Method and apparatus for sensing a borehole characteristic

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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Oscillating shear valve for mud pulse telemetry and...

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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Two sensor impedance estimation for uplink telemetry signals

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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Wireless communication circuit

Communications: electrical – Wellbore telemetering or control – Modification of signal bandwidth – frequency – or circuit...
Reexamination Certificate

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