4. Communications, electrical: acoustic wave systems and devices
  5. Seismic prospecting
  6. Land-reflection type

Douglas J. Patterson

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Active noise cancellation through the use of magnetic coupling

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

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Active noise cancellation through the use of magnetic coupling

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

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Casing thickness evaluation method

Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate

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Identification of stress in formations using angles of fast...

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Reexamination Certificate

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Method and apparatus for characterizing and estimating...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
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Profile ID: LFUS-PAI-P-2324219

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