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Roller cone bit with improved seal gland design

Boring or penetrating the earth – Processes
Reexamination Certificate

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Roller cone bits, methods, and systems with anti-tracking...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Roller cone drill bit having lubrication contamination...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Roller cone drill bit with debris flow paths through...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Roller cone drill bits with enhanced drilling stability and...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Roller-cone bits, systems, drilling methods, and design methods

Boring or penetrating the earth – Processes
Patent

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Roller-cone bits, systems, drilling methods, and design...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Rotary digging and compression enlarging driller and boring...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Rotary drag bits having a pilot cutter configuraton and...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Rotary drill bit and method of forming bore hole

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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Rotary drill bit insert

Boring or penetrating the earth – Processes
Patent

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Rotary drill bit providing separation of liquid from gas

Boring or penetrating the earth – Processes – Boring with specific fluid
Patent

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Rotary drill bits with gage pads having improved...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Rotary drill guard assembly and method

Boring or penetrating the earth – Processes – Boring horizontal bores
Patent

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Rotary drill indexing system

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Rotary drilling drill string stabilizer-cuttings grinder

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Rotary driven pipe-bursting tool

Boring or penetrating the earth – Processes – Boring horizontal bores
Reexamination Certificate

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Rotary sidewall sponge coring apparatus

Boring or penetrating the earth – Processes – Sampling of earth formations
Patent

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Rotary steerable devices and methods of use

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Rotary steerable drilling tool

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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