Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6845826 | Saver sub for a steering tool | Alfred Westermann | 2005-01-25 |
| 5806612 | Apparatus for the transmission of information in a drill string | Werner Vorhoff, Dieter Wrobel | 1998-09-15 |
| 5168941 | Drilling tool for sinking wells in underground rock formations | Volker Krueger, Hans-Juergen Faber | 1992-12-08 |
| 5156222 | Directional drilling tool apparatus and method | Rainer Jurgens, Rudolf Roper, Joachim Oppelt, Dietmar Krehl | 1992-10-20 |
| 5040155 | Double guided mud pulse valve | — | 1991-08-13 |
| 4901290 | Apparatus for the generation of pressure pulses in drilling mud compositions | Johann Biehl | 1990-02-13 |