4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element

George B. Witman, IV

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Drill bit reservoir with controllable relief pressure

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Reexamination Certificate

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One cone bit with interchangeable cutting structures, a...

Boring or penetrating the earth – With bit wear signal generating
Reexamination Certificate

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Single-cone rock bit having cutting structure adapted to...

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2722926

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