Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7524133 | Surface water drainage system | Heino Messerschmidt, Michael Sieber, Arne Stoltenberg | 2009-04-28 |
| 7491017 | Surface drainage system | — | 2009-02-17 |
| 7059804 | Drainage device | Michael Sieber, Heino Messerschmidt, Arne Stoltenberg | 2006-06-13 |
| 6793439 | Securing device for a drainage channel | Wolfgang Arm, Brunhild Schmidtke | 2004-09-21 |