| 8585349 |
Turbine for driving a generator in a drill string |
— |
2013-11-19 |
| 8109721 |
Bearing arrangement for a turbine rotor of a drill string turbine |
Uwe Draeger |
2012-02-07 |
| 8092147 |
Turbine for power generation in a drill string |
Uwe Draeger |
2012-01-10 |
| 8042572 |
Controllable pressure-reducing valve and device for the generation of pressure change signals |
Uwe Draeger |
2011-10-25 |
| 6864593 |
Device for producing of electric energy and of signal transmitting pressure pulses |
Uwe Drager |
2005-03-08 |
| 6850463 |
Borehole logging apparatus for deep well drilling |
— |
2005-02-01 |
| 6636159 |
Borehole logging apparatus for deep well drillings with a device for transmitting borehole measurement data |
— |
2003-10-21 |
| 5182731 |
Well bore data transmission apparatus |
Hans-Juergen Hoelscher, Thomas Kerk, Wilfried Tuennermann |
1993-01-26 |
| 4745276 |
Device for the detection of fluorescent substances on the surface of the earth |
Heribert F. Broicher, Erich Kirsch, Friedhart Knolle, Arthur Zydek |
1988-05-17 |
| 4580049 |
Probe for locating mineral deposits |
Klaus Janssen, Klaus Johnen |
1986-04-01 |
| 4184758 |
Deep sea underwater camera |
— |
1980-01-22 |