Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5312492 | Process not using chlorate or nitrite for the production of nickel and manganese containing zinc phosphate films | Joerg Riesop, Karl-Heinz Gottwald | 1994-05-17 |
| 4968360 | Process for desludging phosphating baths and device for carrying out said process | Karl-Heinz Gottwald, Willi Wuest, Hubert Harth | 1990-11-06 |
| 4944813 | Process for phosphating metal surfaces | Reinhard Opitz | 1990-07-31 |
| 4600447 | After-passivation of phosphated metal surfaces | Reinhard Opitz, Heinz Portz | 1986-07-15 |