Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5468096 | Means for securing a cover over a drainage channel | Heinrich Sauerwein, Wolfgang Arm | 1995-11-21 |
| 5437516 | Surface drainage apparatus | Heinrich Sauerwein, Wolfgang Arm | 1995-08-01 |