4. Tool driving or impacting
  5. Impacting devices
  6. Selective axial direction of impact

Robert F. Crane

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Apparatus for directional drilling

Boring or penetrating the earth – Boring without earth removal
Reexamination Certificate

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Bit for directional drilling

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Drill bit for directional drilling

Boring or penetrating the earth – Boring without earth removal
Reexamination Certificate

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Drill bit for directional drilling

Stone working – Sawing – Oscillating
Reexamination Certificate

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Drill bit for directional drilling in cobble formations

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Reexamination Certificate

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Profile ID: LFUS-PAI-P-297651

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