4. Boring or penetrating the earth
  5. Automatic control
  6. Of fluid pressure below ground

Marvin Gearhart

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Air and mud control system for underbalanced drilling

Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Patent

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Downhole signaling system

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

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Roller cone core bit with spiral stabilizers

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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Telemetry system involving gigahertz transmission in a gas fille

Communications: electrical – Wellbore telemetering or control
Patent

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Profile ID: LFUS-PAI-P-502399

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