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

Duane D. Papke

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Method and apparatus for well drilling

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

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Method for assembling a well drilling tool

Metal working – Method of mechanical manufacture – Assembling or joining
Patent

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Reaming apparatus for well drilling

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

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Stabilizing tool for well drilling

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

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Profile ID: LFUS-PAI-P-1030348

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