4. Cutlery

Leroy W. Ledgerwood, III

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Earth boring drill bit with snap ring cutter retention

Cutlery
Patent

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Increased projection for compacts of a rolling cone drill bit

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

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Nozzle orientation for roller cone rock bit

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

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Optimizing drilling performance using a selected drilling fluid

Boring or penetrating the earth – Automatic control
Reexamination Certificate

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Profile ID: LFUS-PAI-P-344103

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