Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5684092 | Production of rigid foams based on isocyanate | Holger Seifert, Renate Hempel, Udo Rotermund | 1997-11-04 |
| 5624969 | Production of rigid foams based on isocyanate | Holger Seifert, Renate Hempel, Udo Rotermund | 1997-04-29 |