4. Pipe joints or couplings
  5. Particular interface
  6. Tapered

Hydril LLC

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Dope relief method for wedge thread connections

Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate

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Helical groove for a tubular connection

Metal deforming – Process – Tube making or reshaping
Reexamination Certificate

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Wedge thread with high-angle metal seal

Pipe joints or couplings – Particular interface – Tapered
Reexamination Certificate

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