Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691050 | Concrete molding with improved acid resistance | Volkmar Berg | 1997-11-25 |
| 5679735 | Process for the preparation of synthetic resin dispersions | Ulrich Geissler, Heinz-Josef Thevissen | 1997-10-21 |
| 5599597 | Concrete molding with improved acid resistance | Volkmar Berg | 1997-02-04 |