Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5273217 | Method and apparatus for improving the crushing action of demolition tools | Helmar Nafe, Jurgen Winkler | 1993-12-28 |
| 5259464 | Percussion mechanism for a drill rod unit | Hans-Dieter Piotrowski | 1993-11-09 |
| 5199658 | Dual-force hydraulic drive for a demolition tool | Helmar Nafe, Hans-Dieter Piotrowski | 1993-04-06 |
| 5174387 | Method and apparatus for adapting the operational behavior of a percussion mechanism to the hardness of material that is being pounded by the percussion mechanism | Friedrich Arndt, Heribert Vielhaber | 1992-12-29 |
| 5168753 | Measuring device for detecting parameters charterizing the operating behavior of hydraulic assembles | Friedrich Arndt, Heribert Vielhaber | 1992-12-08 |
| 5129466 | Hydraulically operated striking mechanism | Hans-Dieter Piotrowski | 1992-07-14 |
| 5117921 | Hydraulically operated hammer drill | Hans-Dieter Piotrowski | 1992-06-02 |
| 5060761 | Automatic lubricating device for the chisel of a hydraulic striking mechanism | Friedrich Arndt, Heribert Vielhaber | 1991-10-29 |
| 5038668 | Hydraulic striking mechanism | Friedrich Arndt | 1991-08-13 |