4. Valves and valve actuation
  5. Blow-out preventers
  6. Radial reciprocating ram

Double-E Inc.

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Blowout preventer

Valves and valve actuation – Blow-out preventers
Patent

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Blowout preventer

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

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Guide for well pump sucker rod

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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Integrated wellhead tubing string

Wells – Above ground apparatus – With seal for reciprocating member
Patent

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Method of and apparatus for securing capillary tubing in a...

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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