4. Electricity: measuring and testing
  5. Of geophysical surface or subsurface in situ
  6. Using electrode arrays, circuits, structure, or supports

Svein Erling Johnstad

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Device for monitoring of oil-water interface

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Including borehole fluid investigation
Reexamination Certificate

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Electromagnetic method on shallow water using a controlled...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate

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Geophysical data acquisition system

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

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Method for monitoring low-resistivity formation using...

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Reexamination Certificate

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Shallow marine electromagnetic hydrocarbon prospecting

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Using electrode arrays – circuits – structure – or supports
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2332383

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