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Abnormal torque absorber for drilling

Boring or penetrating the earth – Below-ground impact members
Reexamination Certificate

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Accelerator for fishing jar with hydrostatic assist

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Adjustable fishing jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Adjustable kelly bushing for downhole drilling system

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Anchor and method of setting anchor

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Anchoring bolt and method

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Annular air hammer apparatus for drilling wells

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Annular air-hammer apparatus for drilling holes

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Apparatus for connecting motors in tandem

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Apparatus for establishing an anchor

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Apparatus for handling pipe at well site

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Apparatus for handling pipe at well site

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Apparatus for positioning a split retaining ring in a down-hole

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Apparatus for racking drill pipes on floater type platforms

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Apparatus for supporting a drilling platform on the ocean floor

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Auto set bi-directional jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Automatic sequential dual action sealing system

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Backhead and check valve for down-hole drills

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

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Backhead and check valve for down-hole drills

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

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Backhead and drill assembly with backhead

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Reexamination Certificate

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