Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5462615 | Weldable high-strength structural steel with 13% chromium | Ingo von Hagen, Hubertus Schlerkmann, Ulrike Zeislmair | 1995-10-31 |
| 5122198 | Method of improving the resistance of articles of steel to H-induced stress-corrosion cracking | Ingo von Hagen, Gerd Heinz, Hubertus Schlerkmann | 1992-06-16 |
| 4631095 | Steel that is exposed to hydrogen sulfide | Ingo von Hagen, Hans-Georg Hillenbrand | 1986-12-23 |
| 4390367 | High-alloyed steel being resistive to corrosion by natural gas | Norbert Niehaus, Horst Bester | 1983-06-28 |