4. Wells
  5. With electrical means

John J. Ryberg

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Acoustic detection of stress-induced mechanical damage in a...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate

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Acoustic sensor assembly

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Reexamination Certificate

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Acoustic source using a shaftless electrical hammer

Acoustics – Geophysical or subsurface exploration
Reexamination Certificate

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Active reduction of tool borne noise in a sonic logging tool

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

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Adaptive seismic noise and interference attenuation method

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2011452

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