Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5861057 | Drainage concrete | Volkmar Berg | 1999-01-19 |
SR
Siegfried RIFFEL
Overall (All Time): #3,639,560 of 4,157,543Top 90%
1
Patents All Time