Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7897041 | Apparatus for aerobic biological cleaning of waste water | Hubertus Stähler | 2011-03-01 |
| 7172690 | Device for purifying waste water, according to the activated sludge process | — | 2007-02-06 |
| 6039873 | Process for the thoroughgoing aerobic biological purification of waste water | — | 2000-03-21 |
| 4318810 | Apparatus for the conversion of pollutants contained in effluents and effluent sludges | — | 1982-03-09 |
| 4284503 | Device for aerating sewage or sewage-sludges | — | 1981-08-18 |