Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7294227 | Method and system for the treatment of pulp prior to ozone bleaching | Per Anders Matteus Astrom | 2007-11-13 |
| 6989078 | System for conveying shredded pulp to an ozone reactor | Per Anders Matteus Astrom | 2006-01-24 |
| 6458242 | Ozone bleaching process using oxalic acid addition | — | 2002-10-01 |
| 6454900 | Method for two-stage oxygen delignification of chemical pulp | Pia Mellander, Solveig Norden | 2002-09-24 |
| 6319357 | Method for two-stage oxygen bleaching and delignification of chemical pulp | Pia Mellander, Solveig Norden | 2001-11-20 |
| 6238517 | Method for controlling oxygen delignification of pulp | Jan-Eric Haggqvist | 2001-05-29 |
| 6221207 | Oxygen delignification of pulp in two stages with low pressure steam heating between stages | Kjell Forslund, Rune Larsson, Matts Sundin | 2001-04-24 |
| 6221206 | Method for oxygen delignification of a digested pulp | Pia Mellander, Solveig Norden | 2001-04-24 |
| 5997689 | Method of pre-treating secondary fibers with oxygen in a disperser | — | 1999-12-07 |
| 5582352 | Method of preparing chemi-mechanical pulp | — | 1996-12-10 |
| 5429717 | Method of washing of alkaline pulp by adding carbon dioxide to the pulp | Raimo Rasimus | 1995-07-04 |