Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4948518 | Method of separating a suspension of activated sludge and sewage water | — | 1990-08-14 |
| 4846969 | Activated sludge device having movable perforated plates and a nozzle for the destruction of foam | Rolf Ordelheide | 1989-07-11 |