Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4202762 | Process and device for the aeration of waste water | Freerk J. Fontein | 1980-05-13 |
| 4189384 | Gas treatment of liquid | Freerk J. Fontein | 1980-02-19 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4202762 | Process and device for the aeration of waste water | Freerk J. Fontein | 1980-05-13 |
| 4189384 | Gas treatment of liquid | Freerk J. Fontein | 1980-02-19 |