Paul M. Helderle

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Verneuil-l'Etang, FR

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Patents Grantslast 30 patents

Information Patent Grant
Safety valves for wells
- Patent number 4,597,446
- Issue date Jul 1, 1986
- Compagnie Francaise des Petroles
- Paul M. Helderle
- E21 - EARTH DRILLING MINING
Information Patent Grant
Sliding-sleeve valve for an oil well
- Patent number 4,560,005
- Issue date Dec 24, 1985
- Compagnie Francaise des Petroles
- Paul M. Helderle
- E21 - EARTH DRILLING MINING
Information Patent Grant
Device for controlling a safety valve disposed below an activation...
- Patent number 4,518,036
- Issue date May 21, 1985
- Compagnie Francaise des Petroles
- Herve M. Lefebvre
- E21 - EARTH DRILLING MINING