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Replaceable antennas for wellbore apparatus

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

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Resistivity antenna shield, wear band and stabilizer assembly fo

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

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Resistivity receiver spacing

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

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Resistivity sensor for generating asymmetrical current field and

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

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Resistivity tool with selectable depths of investigation

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

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Resistivity tools with collocated antennas

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

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Resistivity tools with load-bearing azimuthally sensitive...

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

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Retrievable resistivity logging system for use in measurement wh

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

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Retrievable, formation resistivity tool, having a slotted...

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

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Robust inversion systems and methods for azimuthally...

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

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Rotating magnet for distance and direction measurements from a f

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By magnetic means
Patent

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Rotating telluric field measurements

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

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