Johannes C. M. van Dongen

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Rijswijk, NL

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for directional drilling
- Patent number 4,836,301
- Issue date Jun 6, 1989
- Shell Oil Company
- Johannes C. M. Van Dongen
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for determining the azimuth of a borehole
- Patent number 4,682,421
- Issue date Jul 28, 1987
- Shell Oil Company
- Johannes C. M. van Dongen
- E21 - EARTH DRILLING MINING