Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6325933 | Process for biological purification of waste water under sludge retention | Claus Dahl | 2001-12-04 |
| 6238562 | Process for biological purification of waste water with reversing operation | Claus Dahl | 2001-05-29 |
| 5908554 | Method and plant for the purification of waste water by the activated sludge method | Bent Tholander | 1999-06-01 |
| 5589068 | Method of controlling waste water purification plants using multiple control functions | — | 1996-12-31 |
| 5547578 | Method of controlling waste water purification plants using quality evaluation of measuring data | — | 1996-08-20 |