Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5662774 | Adjusting the sulphur balance of a sulphate cellulose plant by heat treating black liquor in a last evaporation stage | Jari Ekholm | 1997-09-02 |
| 5639434 | Process for removing nitrogen oxides from the flue gases of a pulp mill | Tapio Patrikainen, Ari Tamminen, Seppo Tuominiemi, Jukka-Pekka Spets, Risto Hämäläinen | 1997-06-17 |