4. Wells
  5. Valves, closures or changeable restrictors
  6. Longitudinally movable operator

Grant Prideco, Inc.

Corporate Assignee

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Details

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Expandable joint connector

Seal for a joint or juncture – Process of static sealing – Pipe – conduit – or cable
Reexamination Certificate

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Fatigue resistant drill pipe

Pipe joints or couplings – With casing – lining or protector
Reissue Patent

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Fatigue resistant drill pipe

Pipe joints or couplings – With casing – lining or protector
Patent

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Heavy weight drill pipe

Pipe joints or couplings – Molded joint – Weld
Patent

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Helical stress relief groove apparatus and method for subterrane

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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