Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5688340 | Preparation of metal surfaces for vitreous enameling | Margit Fleischhacker-Jeworrek, Klaus Wittel | 1997-11-18 |
| 5198020 | Removal of zinc from phosphating process sludges | Wolfgang Fennemann, Rolf Kola | 1993-03-30 |
| 5160551 | Activator for use in phosphating processes | Rüdiger Rein, Kalus-Werner Wittel | 1992-11-03 |