Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6737981 | Apparatus for converting measurement signals into digital signals, the signals having been initiated in a piezo sensor by the impacts of a hydraulic percussion device | Wilhelm Hagemeister, Heinz-Jurgen Prokop | 2004-05-18 |
| 6672403 | Method and apparatus for protecting a fluid-operated percussion device against no-load strokes | Torsten Ahr, Stefan Lohmann | 2004-01-06 |