4. Measuring and testing
  5. Borehole or drilling
  6. Downhole test

Bobby J. Hallmark

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Borehole televiewer system

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent

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Calibrated conduit caliper and method

Geometrical instruments – Area integrators – Electrical
Patent

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Chamber isolator and sealing means for borehole perforating tool

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent

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Method and apparatus for obtaining a core sample at ambient pres

Boring or penetrating the earth – Processes – Sampling of earth formations
Patent

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Sealing projectile

Ordnance – Muzzle loading
Patent

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Profile ID: LFUS-PAI-P-432388

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