Issued Patents All Time
Showing 1–25 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5934383 | Steering device for steerable drilling tool | Volker Krueger, Hans Jurgen Faber, Thomas Kruspe | 1999-08-10 |
| 5156222 | Directional drilling tool apparatus and method | Rudolf Roper, Joachim Oppelt, Dietmar Krehl, Dagobert Feld | 1992-10-20 |
| 5109924 | One trip window cutting tool method and apparatus | Dietmar Krehl | 1992-05-05 |
| 5052502 | Apparatus for directional coring | Johann van Es | 1991-10-01 |
| 5038873 | Drilling tool with retractable pilot drilling unit | — | 1991-08-13 |
| 5029653 | Method for directional coring | Johann van Es | 1991-07-09 |
| 4969528 | Method and apparatus for continuous pilot hole coring | — | 1990-11-13 |
| 4905778 | Device for producing pressure pulses in an oil well fluid medium | — | 1990-03-06 |
| 4873522 | Method for transmitting downhole data in a reduced time | — | 1989-10-10 |
| 4732225 | Deep-borehole drilling device with magnetic coupling | Ulrich Hense | 1988-03-22 |
| 4641289 | Process and device for transmitting information over a distance | — | 1987-02-03 |
| 4614232 | Device for delivering flowable material | Johann Biehl | 1986-09-30 |
| 4610307 | Method and apparatus for selectively straight or directional drilling in subsurface rock formation | Volker Kruger | 1986-09-09 |
| 4553614 | Compensation device for insertion in a drill string for deep-well drilling tools | Thomas Jung | 1985-11-19 |
| 4537097 | Method and apparatus for manufacturing cutting elements particularly for deep drilling | Roland Illerhaus | 1985-08-27 |
| 4499563 | Apparatus for transmitting data from a borehole to the surface of the earth during the operation of a drilling device | — | 1985-02-12 |
| 4498549 | Cutting member for rotary drill bit | — | 1985-02-12 |
| 4471845 | Rotary drill bit | — | 1984-09-18 |
| 4468762 | Telemetry equipment in modules | — | 1984-08-28 |
| 4463815 | Mechanical jarring tool | Dietmar Krehl | 1984-08-07 |
| 4460053 | Drill tool for deep wells | Hermann Rathkamp | 1984-07-17 |
| 4452322 | Drilling device for drilling a core in deep drill holes | — | 1984-06-05 |
| 4452324 | Rotary drill bit | — | 1984-06-05 |
| 4440246 | Cutting member for rotary drill bits | — | 1984-04-03 |
| 4415316 | Down hole motor | — | 1983-11-15 |