Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12195492 | Method for lignin purification | Eric Enqvist, Ville Tarvo | 2025-01-14 |
| 10239904 | Method for producing solid lignin | Eric Enqvist, Ville Tarvo, Tobias Wittmann, Henrik Wallmo, Anders Littorin | 2019-03-26 |
| 10072037 | Method for producing high purity lignin | — | 2018-09-11 |
| 9200406 | Production of pulp using a gaseous organic agent as heating and reaction-accelerating media | Eric Enqvist, Leopold Heinrich, Matti Luhtanen | 2015-12-01 |
| 8524038 | Bleaching process of chemical pulp | Aki Vilpponen | 2013-09-03 |
| 8262854 | Method for recovering hydrolysis products | Päivi Uusitalo | 2012-09-11 |
| 8128784 | Bleaching process of chemical pulp | Aki Vilpponen | 2012-03-06 |
| 6533896 | Method for the production of precleaned pulp | Mikael Svedman, Thomas Fant | 2003-03-18 |
| 5643410 | Batch process for preparing kraft pulp in a batch digesting process | Seppo Hiljanen | 1997-07-01 |
| 5589033 | Production of prehydrolyzed pulp | Kari Kovasin | 1996-12-31 |
| 5183535 | Process for preparing kraft pulp using black liquor pretreatment reaction | — | 1993-02-02 |
| 5139617 | Process for the production of a hemicellulose hydrolysate and special high alpha cellulose pulp | Nils-Erik Virkola | 1992-08-18 |
| 4895618 | Method of controlling alkaline pulping process | Nils-Erik Virkola | 1990-01-23 |
| 4889593 | Method of determining rapidly the concentration of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors | Nils-Erik Virkola | 1989-12-26 |
| 4718979 | Method for rapid determination of the contents of lignin, monosaccharides and organic acids in the process solutions of sulfite pulping | Nils-Erik Virkola | 1988-01-12 |