Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6432237 | Surface improving process | Rainer Hasenkamp | 2002-08-13 |
| 6372135 | Filter for holding and raising ground water | Hans-Peter Kohlstadt, Klaus Marten, Werner Fahle, Rainer Tost, Annebärbel Tost +2 more | 2002-04-16 |