Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4738762 | Electrowinning system | Lars A. Hedstrom | 1988-04-19 |
| 4734172 | Method for selectively recovering lead from complex sulphidic non-ferrous metal concentrates | Lars A. Hedstrom, Nils F. R. Lindstrom | 1988-03-29 |