4. Wells
  5. Valves, closures or changeable restrictors
  6. Fluid operated

Michael L. Cognevich

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Pilot operated safety relief valve

Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent

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Plunger for a downhole reciprocating oil well pump and the metho

Pumps – Expansible chamber type – Valved piston
Patent

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Pressure equalizing flapper type safety valve for subterranean w

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Reactor vessel stud closure system

Implements or apparatus for applying pushing or pulling force – Pipe or rod jack – Tie rod tensioner
Patent

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Releasable well tool stabilizer

Wells – Guide for device or conduit – On sucker or pump rod
Patent

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Profile ID: LFUS-PAI-P-300850

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