Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10351930 | Silver recovery by ion exchange | Kari Valkama, Mikko Tyster, Sami Virolainen | 2019-07-16 |
| 10221493 | Method for recovery of copper and zinc | Erkki Paatero, Kari Hietala | 2019-03-05 |