Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5094730 | Method for forming a metallic coating on steel pipes | Werner Friehe, Wilhelm Schwenk | 1992-03-10 |
| 4513995 | Method for electrolytically tin plating articles | Werner Friehe, Wilhelm Schwenk | 1985-04-30 |
| 4390367 | High-alloyed steel being resistive to corrosion by natural gas | Rolf Popperling, Horst Bester | 1983-06-28 |