4. Communications: electrical
  5. Wellbore telemetering or control
  6. Selective control of subsurface equipment

Jian Jin

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Apparatus and method for determining boring direction when borin

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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Apparatus and method for simultaneously locating a fixed...

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Reexamination Certificate

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Apparatus and method for simultaneously locating a fixed...

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Reexamination Certificate

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Apparatus and method for tracking multiple signal emitting...

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Reexamination Certificate

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Electron microscope phase enhancement

Radiant energy – With charged particle beam deflection or focussing – Magnetic lens
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1393934

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