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

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Core cutting rock bit

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

Patent

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Core drill

Boring or penetrating the earth – Bit or bit element – Casing shoe type

Reexamination Certificate

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Core drill

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion

Reexamination Certificate

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Core drill bit

Boring or penetrating the earth – Bit or bit element – Core forming type

Patent

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Core drill bits with enclosed fluid slots

Boring or penetrating the earth – Bit or bit element – Core forming type

Reexamination Certificate

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Core sampler

Boring or penetrating the earth – Bit or bit element – Core forming type

Patent

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Core sampling drill

Boring or penetrating the earth – Bit or bit element – Core forming type

Patent

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Corrosion protection for head section of earth boring bit

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

Reexamination Certificate

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Crossflow rotary cone rock bit with extended nozzles

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

Patent

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Crowned surface with PDC layer

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

Patent

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Cup-shaped rock drill head

Boring or penetrating the earth – Bit or bit element – Impact or percussion type

Reexamination Certificate

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Curved contact portion on engaging elements for rotary type drag

Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements

Patent

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Cutter assemblies and cutting elements for rotary drill bits

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

Patent

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