Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5186611 | Pump arrangement for pumping liquid by means of compressed air | — | 1993-02-16 |
| 4769138 | Air-driven contact filter | — | 1988-09-06 |
| 4351721 | Device for flushing and aerating a surface coated with microorganisms in a plant for biological purification of waste water | — | 1982-09-28 |