Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5294923 | Method and apparatus for relaying downhole data to the surface | Leslie T. SHALE, Frank C. Forest | 1994-03-15 |
| 5205364 | Process and drilling equipment for sinking a well in underground rock formations | Friedhelm Makohl | 1993-04-27 |
| 5099931 | Method and apparatus for optional straight hole drilling or directional drilling in earth formations | Volker Krueger, Johannes Witte | 1992-03-31 |
| 5027912 | Drill bit having improved cutter configuration | — | 1991-07-02 |
| 4955438 | Core drilling tool | Axel Sperber | 1990-09-11 |
| 4265323 | Direct bit drive for deep drilling tools | — | 1981-05-05 |