4. Communications: electrical
  5. Wellbore telemetering or control

Douglas Patterson

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Acoustic isolator for well logging system

Acoustics – Geophysical or subsurface exploration – Well logging
Reexamination Certificate

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Hydraulic unit

Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate

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Hydraulic unit for an anti-lock vehicle brake system

Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate

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Measurement-while-drilling acoustic system employing...

Communications: electrical – Wellbore telemetering or control
Reexamination Certificate

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Use of electromagnetic acoustic transducers in downhole...

Wells – Processes – With indicating – testing – measuring or locating
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Profile ID: LFUS-PAI-P-2616145

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