Issued Patents All Time
Showing 25 most recent of 64 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8277608 | Method for treating pulp in connection with the bleaching of chemical pulp | Olavi Pikka, Pekka Tervola | 2012-10-02 |
| 7070677 | Method and apparatus for treating pulp with filler | — | 2006-07-04 |
| 6736934 | Method of pretreating pulp in an acid tower prior to bleaching with peroxide | Olavi Pikka | 2004-05-18 |
| 6733625 | Method and apparatus for treating pulp | Eero Kontturi, Olavi Pikka, Janne Vehmaa | 2004-05-11 |
| 6582554 | Continuous digester having a sectioned top separator with multiple liquor extraction ports | C. Bertil Stromberg, Richard O. Laakso, John Bolles, Keith Vogel, Patrick Sullivan | 2003-06-24 |
| 6579411 | Bleaching medium consistency pulp with ozone | Torolf Laxen, Juhani Peltonen | 2003-06-17 |
| 6547923 | Process for bleaching medium consistency pulp with ozone using a pressurized fluidizing mixer | Torolf Laxen, Juhani Peltonen | 2003-04-15 |
| 6544384 | Pretreatment of chips before cooking | Aki Vilpponen, Hannu RÅMARK, Auvo Kettunen, C. Bertil Stromberg | 2003-04-08 |
| 6506283 | Pretreatment of chips before cooking | Aki Vilpponen, Hannu RÅMARK, Auvo Kettunen, C. Bertil Stromberg | 2003-01-14 |
| 6475338 | Method of minimizing transition metal ions during chemical pulping in a digester by adding chelating agent to the digester | Jian E. Jiang | 2002-11-05 |
| 6375797 | Bleaching chemical pulp in a PkDQ-Po Sequence | Olavi Pikka | 2002-04-23 |
| 6358363 | Method and apparatus for bleaching pulp using two fluidizing mixers | — | 2002-03-19 |
| 6354514 | Method and apparatus for treating material having poor thermal conductivity | Kari Peltonen | 2002-03-12 |
| 6350348 | Batch cooking with black liquor pretreatment | Auvo Kettunen, Hannu RÅMARK | 2002-02-26 |
| 6306253 | Acid treatment of pulp at high temperature prior to chlorine dioxide bleaching | — | 2001-10-23 |
| 6248208 | Pretreatment of chips before cooking | Aki Vilpponen, Hannu RÅMARK, Auvo Kettunen, C. Bertil Stromberg | 2001-06-19 |
| 6174411 | Continuous digester with inverted top separator | Richard O. Laakso, C. Bertil Stromberg | 2001-01-16 |
| 6136145 | Method for treating pulp in an indirect heat exchanger in connection with bleaching | Olavi Pikka | 2000-10-24 |
| 6106667 | Treatment of recycled bleach plant filtrates | — | 2000-08-22 |
| 6024837 | Low temperature gas phase continuous digester | Richard O. Laakso, C. Bertil Stromberg | 2000-02-15 |
| 6010594 | Method of bleaching pulp with chlorine-free chemicals wherein a complexing agent is added immediately after an ozone bleach stage | Bertil Stromberg | 2000-01-04 |
| 5958181 | Continuous cooking with a two-stage cool impregnation | C. Bertil Stromberg, J. Robert Prough, Bruno Marcoccia | 1999-09-28 |
| 5674359 | Continuous cooking of cellulosic fibrous material with cold alkali impregnation | R. Fred Chasse, Bruno Marcoccia | 1997-10-07 |
| 5660686 | Cooking with spent liquor pretreatment of cellulose material | Pekka Tervola | 1997-08-26 |
| 5635026 | Cooking cellulose material with high alkali concentrations and/or high pH | Auvo Kettunen, Aki Vilpponen, Jian E. Jiang, Bruno Marcoccia | 1997-06-03 |