4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element
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Vacuum, vacuum-pressure, or pressure circulation bit having jet-

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

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Vacuum, vacuum-pressure, or pressure reverse circulation bit

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Variable diameter earth boring bit

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Variable length three-cone rock bit nozzles

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

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Variable orientation nozzles for earth boring drill bits,...

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

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Varied pitch rotary rock bit

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

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Vibration and erosion resistant nozzle

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

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Volume and pressure balanced rigid face seal for rock bits

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

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