Paul M. Helderle

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Champdeuil, FR

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Patents Grantslast 30 patents

Information Patent Grant
Procedure and device for treating well perforations
- Patent number 6,378,611
- Issue date Apr 30, 2002
- Total Fina S.A.
- Paul Maxime Helderle
- E21 - EARTH DRILLING MINING
Information Patent Grant
Annular safety assembly for an oil well, especially a double produc...
- Patent number 4,726,422
- Issue date Feb 23, 1988
- Total Compagnie Francaise des Petroles
- Paul M. Helderle
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hydraulically controlled safety valves for incorporation in product...
- Patent number 4,651,827
- Issue date Mar 24, 1987
- Total Compagnie Francaise des Petroles
- Paul M. Helderle
- E21 - EARTH DRILLING MINING