Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6280624 | Biological waste water purification process and device | Ulrich Hermanns, Sigurd Schlegel, Andreas Stein | 2001-08-28 |
| 6200476 | Method an device for introducing oxygen into water or aqueous solutions | Sabine Donath | 2001-03-13 |