Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6174107 | Device for creation of an oxidation and precipitation zone or a reduction zone in an aquifer | — | 2001-01-16 |
| 4755304 | Method of purifying ground water | Rolf O. Hallberg | 1988-07-05 |
| 4683064 | Process for decreasing the nitrate content in water | Rolf O. Hallberg | 1987-07-28 |
| RE31347 | Procedure for separating and recovering marsh gas | Veli E. Reijonen, Rolf O. Hallberg | 1983-08-16 |