LandOfFree - US Patents - Listing for Boring or penetrating the earth,Bit or bit element

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Vacuum, vacuum-pressure, or pressure circulation bit having jet-

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

Patent

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Vacuum, vacuum-pressure, or pressure reverse circulation bit

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

Patent

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Variable diameter earth boring bit

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

Patent

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Variable length three-cone rock bit nozzles

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

Patent

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Variable orientation nozzles for earth boring drill bits,...

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

Reexamination Certificate

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Variable wear pad for crossflow drag bit

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet

Patent

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Varied pitch rotary rock bit

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

Patent

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Vibration and erosion resistant nozzle

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

Patent

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Volume and pressure balanced rigid face seal for rock bits

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

Patent

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Vortex drill bit

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

Patent

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