Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7309862 | Method for marking sites | Karl-Heinz Drenker, Volker Kahle, Norbert Donkels | 2007-12-18 |
| 7126119 | Method for marking sites | Karl-Heinz Drenker, Volker Kahle, Norbert Donkels | 2006-10-24 |