4. Communications, electrical: acoustic wave systems and devices
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Permanent downhole resonant source

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

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Pilot operated mud pulse valve and method of operating the same

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

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Power transmission apparatus for enclosed fluid systems

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

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Pressure pulse detection apparatus

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

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Pressure pulse detection apparatus incorporating noise reduction

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

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Pressure pulse generator for downhole tool

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

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Pressure pulse generator for measurement-while-drilling...

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

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Pressure pulse generator system for measuring while drilling

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

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Pressure signalling for fluidic media

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

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Pressure waves decoupling with two transducers

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

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Process and device for transmitting information over a distance

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

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Pulse production and control in drill strings

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

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Pulser

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

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