Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5174985 | Process for the oxidation of water-insoluble organic compounds | Hans-Helmut Schwarz, Friedhelm Sahlmen, Otto Immel | 1992-12-29 |
| 5173466 | Catalyst for the reduction of nitrogen oxides from waste gases and a process for its production | Hans-Hermann Heins, Peter Danz, Martin Ullrich, Klaus Holzer, Eberhard Zirngiebl +1 more | 1992-12-22 |
| 5000853 | Process for the improved separation of clarified liquid from biomass in the biological treatment of sewage | Artur Reischl, Friedhelm Sahlmen | 1991-03-19 |
| 4988234 | Gulley closure | Karl-Heinz Rudolph, Friedhelm Sahlmen, Rolf Brockmann | 1991-01-29 |
| 4735725 | Process for the improved separation of clarified liquid from biomass in the biological treatment of sewage | Artur Reischl, Friedhelm Sahlmen | 1988-04-05 |