Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6436232 | Procedure for adding a filler into a pulp based on cellulose fibers | Petri Silenius, Markku Leskelä, Esa Halinen | 2002-08-20 |
| 5813758 | Concentric ring fluidizing mixer | Thomas R. Delcourt, Ronald Bain, C. Bertil Stromberg | 1998-09-29 |
| 5549788 | Minimal effluents discharge pulp mill with chemical recovery | Tuomo Nykanen, Brian F. Greenwood, Erkki Kiiskila, Esko Mattelmaki, Joseph R. Phillips +4 more | 1996-08-27 |
| 5547543 | Apparatus for minimizing effluent discharges and recovering chemicals in a pulp mill | Tuomo Nykanen, Brian F. Greenwood, Erkki Kiiskila, Esko Mattelmaki, Joseph R. Phillips +4 more | 1996-08-20 |
| 5518583 | Zero discharge mill distillation, salt recovery, and water management | Tuomo Nykanen, Brian F. Greenwood, Erkki Kiiskila, Esko Mattelmaki, Joseph R. Phillips +4 more | 1996-05-21 |
| 5380402 | Reducing pulp mill liquid discharge | Rolf Ryham, Tuomo Nykanen, Brian F. Greenwood, Erkki Kiiskila, Esko Mattelmaki +4 more | 1995-01-10 |
| 5374333 | Method for minimizing pulp mill effluents | Tuomo Nykanen, Brian F. Greenwood, Erkki Kiiskila, Esko Mattelmaki, Joseph R. Phillips +4 more | 1994-12-20 |
| 5047118 | Method for decreasing energy consumption during refining of fiber material at a reduced grinding frequency while maintaining capacity | — | 1991-09-10 |
| 4986480 | Method and apparatus for feeding a conical refiner | Bengt Nilsson, Ronny Hoglund | 1991-01-22 |
| 4854819 | Method and apparatus for pumping fibre suspensions | — | 1989-08-08 |
| 4842688 | Method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents | Pertti Hynninen | 1989-06-27 |
| 4826398 | Medium consistency pump with self-feeding | — | 1989-05-02 |
| 4812207 | Method of removing lignin from bleach plant effluents | Pertti Hynninen | 1989-03-14 |
| 4780053 | Method and apparatus for pumping fiber suspensions | — | 1988-10-25 |
| 4776758 | Combined fluidizing and vacuum pump | — | 1988-10-11 |
| 4754935 | Method and apparatus for refining fibrous material | — | 1988-07-05 |
| 4594152 | Method and an apparatus for treating fibre suspensions | — | 1986-06-10 |
| 4435193 | Controlling operation of a centrifugal pump | Esko Härkönen, Toivo Niskanen, Jaakko Kujala, Voitto Reponen | 1984-03-06 |
| 4410337 | Method and an apparatus for separating a gas from a fibre suspension | Jaakko Kujala, Toivo Niskanen, Voitto Reponen, Esko Härkönen | 1983-10-18 |
| 4362536 | Pulp degassing | — | 1982-12-07 |
| 4222818 | Method for treatment of lignocellulosic material with chlorine | Frey Sundman | 1980-09-16 |