Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5019266 | Waste water purification process with batchwise supply of waste water to the activated sludge tank | Carl-Johannes Soeder, Thomas Raphael, Heiner Keusen, Joost Groeneweg | 1991-05-28 |
| 4793930 | Process for waste water purification employing the activated sludge process | Carl-Johannes Soeder, Heinrich Keusen, Franz Hofmeister | 1988-12-27 |