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

David Truax

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Asymmetric diamond impregnated drill bit

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

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Bi-centered drill bit having improved drilling stability mud...

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate

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Bi-centered drill bit having improved drilling stability,...

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Reexamination Certificate

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Coarse carbide substrate cutting elements and method of...

Earth working – Tool – standard or connection – Tool is transversely elongated blade
Reexamination Certificate

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Cutter assembly for rock bits with back support groove

Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent

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Profile ID: LFUS-PAI-P-105924

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