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Jack element for a drill bit

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

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Jack element with a stop-off

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

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Jet bit with variable orifice nozzle

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

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Jet dual bit

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

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Jetting apparatus

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

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Joint for use in a directional boring apparatus

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent

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Journal bearing type rock bit

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

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Journal bushing drill bit construction

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

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