Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7731777 | Method for processing anode sludge | Henri Virtanen, Olli Jarvinen | 2010-06-08 |
| 7670575 | Method and device for treating anode slime | Olli Jarvinen, Pekka Taskinen, Olli Hyvärinen, Henri Virtanen | 2010-03-02 |
| 6495024 | Method for the removal of arsenic from sulfuric acid solution | Henri Virtanen | 2002-12-17 |
| 5141753 | Method for utilizing the copper-arsenic precipitate created in the electroytic refining of copper in the production of anti-rot agents for wood | Henri Virtanen | 1992-08-25 |
| 4473396 | Procedure for roasting seleniferous material | Olli Hyvärinen, Eino A. Rosenberg | 1984-09-25 |
| 4228133 | Apparatus for sulfatizing roasting of a finely-divided selenium-bearing raw material | Ahti E. Turpeinen, Aarne A. Kapanen | 1980-10-14 |