LandOfFree - US Patents - Listing for Boring or penetrating the earth,Bit or bit element,Bit with leading portion forming smaller diameter initial bore

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Rotary 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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Rotary drill bits

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

Patent

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Sectional drive system

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

Reexamination Certificate

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Single-pass notching and drilling tool and method of drilling a

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

Patent

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Sub-reamer for bi-center type tools

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

Reexamination Certificate

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Superposed drilling device

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

Patent

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System, method and cutterhead for dry full-area drilling

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

Patent

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Triangular oil well drill bit for use in unconsolidated formatio

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

Patent

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Triangular oil well drill bit for use in unconsolidated formatio

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

Patent

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Two stage 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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