Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5922434 | Production of multi-ply products using an adhesion promoter | Dieter Butterfass, Kai Olfermann | 1999-07-13 |
| 4997868 | Cationic asphalt emulsions | Peter Blanpain, Roland Offner, John W. Creak | 1991-03-05 |