Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5094730 | Method for forming a metallic coating on steel pipes | Norbert Niehaus, Werner Friehe | 1992-03-10 |
| 4513995 | Method for electrolytically tin plating articles | Norbert Niehaus, Werner Friehe | 1985-04-30 |
| 4454172 | Lining metal tubing with a corrosion- and abrasion-proof cement mortar | Bruno Heinrich | 1984-06-12 |
| 4390568 | Lining a steel pipe internally with a cement mortar | Bruno Heinrich, Rolf Mangen | 1983-06-28 |