Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6793439 | Securing device for a drainage channel | Brunhild Schmidtke, Markus Blaschke | 2004-09-21 |
| 5518336 | Drainage gutter and method of installing | Heino Messerschmidt | 1996-05-21 |
| 5468096 | Means for securing a cover over a drainage channel | Heinrich Sauerwein, Jan Witt | 1995-11-21 |
| 5466091 | Surface drainage apparatus | Heinrich Sauerwein | 1995-11-14 |
| 5462382 | Surface drainage apparatus | Heinrich Sauerwein | 1995-10-31 |
| 5437516 | Surface drainage apparatus | Heinrich Sauerwein, Jan Witt | 1995-08-01 |