Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6846336 | Acid-resistant solutions containing aromatic formaldehyde condensation products | Klaus Walz, Hans-Albert Ehlert, Ralf Heinen | 2005-01-25 |
| 6610884 | Polycarboxylic acids, preparation thereof and use thereof for treating cellulosic fibres or textile or paper materials produced therefrom | Hans-Albert Ehlert, Gunter Franke, Helmut-Martin Meier | 2003-08-26 |