Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5964982 | Method of removing encrustations in evaporation plants | Dieter Stein, Ulrich Wagner, Ludwig Englmaier | 1999-10-12 |
| 5470444 | Process for preparing low iron ammonium alum | Ingo F. Litzenberger, Dieter Stein | 1995-11-28 |
| 4330520 | Process and apparatus for preventing NO.sub.x emissions after emergency shutdowns of plants for the manufacture of nitric acid | — | 1982-05-18 |
| 4305919 | Process and plant equipment for the short-term propulsion of one or several turbines coupled to an air and/or nitrous gas compressor in a plant for the production of nitric acid | — | 1981-12-15 |