4. Pipe joints or couplings
  5. Serial,relatively movable portions
  6. Linked ball and socket portions

Paul E. Helfer

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Casing hanger

Pipe joints or couplings – Serial,relatively movable portions – Linked ball and socket portions
Patent

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Pipe disconnecting apparatus

Wells – Above ground apparatus – With means facilitating connecting or disconnecting...
Patent

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Pipe disconnecting apparatus

Metal working – Means to assemble or disassemble – By rotation of work part
Patent

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Ram-type blowout preventer

Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Patent

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Rotating drilling head with spaced apart seals

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent

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Profile ID: LFUS-PAI-P-851320

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