Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5800092 | Method for delaying run-off of flash-storm water or ordinary rainwater from roofs and other surfaces with water-retention capability | Werner Nill | 1998-09-01 |
| 5524393 | Method and device for delaying the run-off of flash-storm water or ordinary rainwater from roofs and other surfaces with water-retention capability | Werner Nill | 1996-06-11 |