Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691050 | Concrete molding with improved acid resistance | Helmut Rinno | 1997-11-25 |
| 5599597 | Concrete molding with improved acid resistance | Helmut Rinno | 1997-02-04 |
VB
Volkmar Berg
Overall (1997): #20,582 of 185,788Top 15%
2
Patents 1997