Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6336994 | Totally chlorine free bleaching process using recovered filtrate | Bengt Nilsson, Lars Stigsson | 2002-01-08 |
| 6113742 | Digester having screening arrangement for isothermal cooking of fibrous material | Johanna Svanberg | 2000-09-05 |
| 5919337 | Method of continuously isothermally cooking of pulp | Sven-Erik Olsson, Stig Andtbacka, Finn Jacobsen, Johanna Svanberg | 1999-07-06 |
| 5827401 | Screen system for a continuous digester | Kenneth Bellstrom, Finn Oulie, Johanna Svanberg, Soren Soderqvist | 1998-10-27 |
| 5766413 | Process for isothermal cooking pulp in a continuous digester | Johanna Svanberg | 1998-06-16 |
| 5746886 | Method for the recovery of energy and chemicals from cellulose spent liquor containing potassium using a gasifier | Lars Stigsson | 1998-05-05 |
| 5628872 | Method for bleaching pulp with hydrogen peroxide recovered from cellulosic spent liquor | Lars Stigsson, Ove Wallergard | 1997-05-13 |
| 5591303 | Process for operating a digester | Finn Oulie, Johanna Svanberg | 1997-01-07 |
| 5567280 | Digester for cooking pulp having staggered circular screens for isothermal cooking | Kenneth Bellstrom, Finn Oulie, Johanna Svanberg, Soren Soderqvist | 1996-10-22 |
| 5529661 | Process for controlling the flow of cellulosic fiber material through an impregnation vessel | — | 1996-06-25 |
| 5470437 | Digester for cooking pulp having staggered screens | Finn Oulie, Johanna Svanberg | 1995-11-28 |
| 5415734 | Process for bleaching pulp without using chlorine containing chemicals | Stig Andtbacka, Bjorn Dillner | 1995-05-16 |
| 5217575 | Process for oxygen bleaching using two vertical reactors | — | 1993-06-08 |
| 5192396 | Process for the continuous digestion of cellulosic fiber material | — | 1993-03-09 |
| 5080755 | Process for the continuous digestion of cellulosic fiber material | — | 1992-01-14 |
| 4968385 | Method of preparing a plup using a fluidizing centrifugal pump during impregnation | Julio Amador, Eurico de Faria Amaro, Hans T. Haukerud | 1990-11-06 |
| 4922989 | Treatment of mechanical pulp to remove resin | Olof Ferritsius, Goran Tistad | 1990-05-08 |
| 4596631 | Method of removing latency from medium consistency pulps by pumping the pulp | J. Robert Prough, Louis O. Torregrossa | 1986-06-24 |
| 4419184 | Method for control of chemicals during gas treatment of suspensions | — | 1983-12-06 |