4. Boring or penetrating the earth
  5. Boring without earth removal

Mark D. Randa

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Drill bit for impact-assisted directional boring

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

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Drill string joint

Pipe joints or couplings – With means blocking release of holding means – Thread lock
Reexamination Certificate

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Method and apparatus for on-grade boring

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Advancing subterranean length of pipe or cable
Reexamination Certificate

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Method and apparatus for replacement of underground pipe

Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Reexamination Certificate

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Method and apparatus for replacement of underground pipe

Tool driving or impacting – Impacting devices – Impact transmitting anvil
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2104603

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