| Patents for D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872) |
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| 11/11/1999 | WO1999045191A9 Treatment of cellulose material with additives while producing cellulose pulp |
| 11/02/1999 | US5976321 Process for making sulfur enhanced undigested cellulosic fiber material and pulp |
| 10/28/1999 | WO1999054544A1 Method of producing lignocellulosic pulp from non-woody species |
| 10/28/1999 | CA2328991A1 Method of producing lignocellulosic pulp from non-woody species |
| 10/19/1999 | US5968314 Comminution of cellulose fibers, slurrying and digestion of fibers, purging with air |
| 10/05/1999 | CA2022760C Process for the comminution of materials |
| 09/28/1999 | US5958181 Wood chips |
| 09/16/1999 | WO1999046444A1 Eucalyptus biokraft pulping process |
| 09/14/1999 | US5950840 Bar screen system with attached screens |
| 09/10/1999 | WO1999045191A1 Treatment of cellulose material with additives while producing cellulose pulp |
| 09/10/1999 | CA2320131A1 Treatment of cellulose material with additives while producing cellulose pulp |
| 09/08/1999 | CN2337178Y De-inking machine |
| 08/31/1999 | US5944953 Pulping |
| 08/26/1999 | WO1999042652A1 Process for production of chemical pulp from herbaceous plants |
| 08/19/1999 | WO1999041448A1 Method for the simple and environmentally benign pulping of nonwood fibrous materials |
| 06/09/1999 | EP0921228A2 Method for the production of precleaned pulp |
| 05/25/1999 | US5906709 Reducing size of raw materials to provide pumpable material, flowing in thin and turbulent layer while heating and introducing digesting agent to produce cellulose fibers |
| 04/29/1999 | WO1999020828A1 Method for sulfite pulping using surfactants |
| 04/29/1999 | WO1999020827A1 Process system and method for preliminary treatment of disintegrated cellulose-containing material prior to pulp digestion |
| 04/20/1999 | CA2217415A1 Method for sulfite pulping using surfactants |
| 04/14/1999 | CN1214091A Process for producing pulp from lignocellulosic plants, and pulp obtained |
| 03/25/1999 | WO1999014423A1 Polysulfide pulping process |
| 03/24/1999 | EP0903436A2 Method in connection with impregnation and digestion of lignocellulosic material |
| 02/18/1999 | WO1999007936A1 Continuous cooking with cool impregnation and dom control |
| 02/17/1999 | EP0896648A1 Hydrogen sulphide pretreatment of lignocellulosic material in continuous pulping processes |
| 02/02/1999 | US5865948 Oxygen-free solvent pulping |
| 01/28/1999 | WO1999004087A1 Pulp, paper and absorbent products of reduced pitch content and process |
| 01/28/1999 | WO1999004086A1 Pretreatment of wood particulates for removal of wood extractives |
| 01/21/1999 | DE19730486A1 Processing lignocellulose-containing biomass, especially wood |
| 01/13/1999 | CN1041645C Method for producing viscose pulp |
| 01/12/1999 | USRE36033 Treatment of fibers |
| 01/05/1999 | CA2036171C Method and apparatus for wood chip sizing |
| 12/30/1998 | WO1998059107A1 Method in connection with the pretreatment of comminuted fibrous material |
| 12/29/1998 | US5853537 Process for treating pulpwoods and pulps with a pitch degrading fungus of the genus Ophiostoma |
| 12/23/1998 | WO1998058119A1 Method and installation for the continuous preparation of paper pulp from lignocellulose textile fibres |
| 12/23/1998 | CN1202944A Method for improving the efficiency of chemical pluping processes by pretreating wood or pulpwood with white rot fungi |
| 12/23/1998 | CA2296170A1 Method and installation for the continuous preparation of paper pulp from lignocellulose textile fibres |
| 12/22/1998 | US5851351 Method of microbial pre-treating wood chips for paper making |
| 11/24/1998 | US5840249 Treating cellulose pulp with thin wax film, filtration, adding potassium sorbate and then citric acid |
| 11/18/1998 | EP0777780B1 Sulphite digestion process |
| 11/04/1998 | EP0874935A1 Process for producing pulp from lignocellulosic plants, and pulp obtained |
| 10/21/1998 | EP0748412B1 Impact of temperature and alkali charge on pulp brightness |
| 10/01/1998 | WO1998042914A1 Method and apparatus for commercial scale biopulping |
| 09/30/1998 | EP0866808A1 Methods and apparatus for the extraction of phytochemicals from fibrous plants |
| 09/09/1998 | EP0782642A4 Method and apparatus for the continuous production of cellulosic pulp |
| 09/03/1998 | WO1998038328A1 Method for producing cellulose derivatives |
| 09/01/1998 | CA2137276C Method of preparing chemi-mechanical pulp |
| 08/19/1998 | CN1190683A High strength corrugated raw paper pulp production technology |
| 08/13/1998 | WO1998035092A1 Method and device for the continuous cooking of chemical pulp |
| 08/13/1998 | WO1998035089A1 Method and apparatus for preheating an impregnating cellulosic material |
| 08/06/1998 | WO1998033970A1 Process for producing fibrous materials with improved properties |
| 08/06/1998 | DE19704054A1 Verfahren zur Herstellung von Faserstoffen mit verbesserten Eigenschaften A process for producing fibrous materials with improved properties |
| 08/06/1998 | CA2279524A1 Process for producing fibrous materials with improved properties |
| 07/30/1998 | WO1998032912A1 Batch cooking with black liquor pretreatment |
| 07/30/1998 | CA2278181A1 Batch cooking with black liquor pretreatment |
| 07/23/1998 | WO1998031871A1 Method for fractionating cereal straw, in particular wheat and barley |
| 07/15/1998 | EP0852636A1 Method for improving the efficiency of chemical pulping processes by pretreating wood or pulpwood with white rot fungi |
| 07/07/1998 | US5776305 Low-resident, high-temperature, high-speed chip refining |
| 06/16/1998 | US5766418 Handling fibrous material used to produce cellulose pulp |
| 06/10/1998 | CN1184182A Clean papermaking process |
| 05/26/1998 | US5756098 Methods for the extraction of phytochemicals from fibrous plants in the absence of solvent |
| 05/19/1998 | US5753075 Slurry pumps, pulping |
| 05/12/1998 | US5750005 Inoculating wood chips with a white rot funi and corn steep liquor as a fungal nutrient; incubation; pulping; delignification |
| 05/07/1998 | WO1998019000A1 Method and system for feeding comminuted fibrous material |
| 04/30/1998 | WO1998017857A1 Removal of metals from treatment fluids in a cellulose pulp mill |
| 04/29/1998 | EP0837965A1 Impregnation of fiber material |
| 04/16/1998 | WO1998015687A1 Method and apparatus for pulping with controlled heating to improve delignification and pulp strength |
| 04/07/1998 | US5736006 Steaming comminuted cellulose fibers, slurrying with kraft liquor, pressurizing, hydraulically feeding to treatment vessesl, heating by contacting with hot kraft cooking liquid |
| 03/25/1998 | EP0821749A4 Method for co-refining dry urban wood chips and blends of dry urban wood chips and thermoplastic resins for the production of high quality fiberboard products |
| 02/11/1998 | EP0823004A1 Impregnation of cellulose-containing material with black liquor in a single vessel digester |
| 02/04/1998 | EP0821749A1 Method for co-refining dry urban wood chips and blends of dry urban wood chips and thermoplastic resins for the production of high quality fiberboard products |
| 01/07/1998 | EP0689625B1 Pitch degradation with white rot fungi |
| 01/06/1998 | US5705383 Inoculating log with schizophyllum, trichaptum and/or phanerochaete fungi; conserves electricity |
| 01/06/1998 | US5705369 Treatment with acid, heating, distillation of lignocellulose and removal of soluble portions |
| 12/23/1997 | US5700355 Chip feeding for a continuous digester |
| 12/16/1997 | US5698667 Pretreatment of wood particulates for removal of wood extractives |
| 11/06/1997 | WO1997041294A1 Hydrogen sulphide pretreatment of lignocellulosic material in continuous pulping processes |
| 11/04/1997 | US5683650 Bubble apparatus for removing and diluting dross in a steel treating bath |
| 11/04/1997 | CA2121969C Pre-treatment of sulfite pulp before bleaching with oxygen containing chemicals |
| 10/28/1997 | US5681427 Apparatus for treating pulp produced by solvent pulping |
| 10/21/1997 | US5679217 Decreasing liquor-to-wood ratio in digester while increasing in pre-impregnation vessel |
| 10/14/1997 | US5676795 Digestion |
| 10/07/1997 | US5674359 Continuous cooking of cellulosic fibrous material with cold alkali impregnation |
| 09/24/1997 | EP0796367A1 Production of prehydrolyzed pulp |
| 09/24/1997 | CN1160426A Sulphite fusion process |
| 08/19/1997 | US5658428 Method for impregnation in a single-vessel hydraulic digester |
| 08/14/1997 | WO1997029236A1 Method for continuous cooking of cellulose-containing fibre material |
| 08/13/1997 | CN1157016A Low-resident high-temp high-speed chip refining |
| 08/07/1997 | WO1997028305A1 Process and apparatus for treatment of fibrous raw material |
| 08/07/1997 | CA2244933A1 Process and apparatus for treatment of fibrous raw material |
| 07/24/1997 | WO1997026401A1 Process for producing pulp from lignocellulosic plants, and pulp obtained |
| 07/24/1997 | CA2242232A1 Process for producing pulp from lignocellulosic plants, and pulp obtained |
| 07/22/1997 | US5650120 Bubble-operated recirculating pump for metal bath |
| 07/09/1997 | EP0782642A1 Method and apparatus for the continuous production of cellulosic pulp |
| 06/25/1997 | EP0780510A2 A process for the production of cellulose |
| 06/19/1997 | WO1997021734A1 Methods and apparatus for the extraction of phytochemicals from fibrous plants |
| 06/17/1997 | US5639419 Bubble operated dross diluting pump for a steel treating bath |
| 06/11/1997 | EP0777780A1 Sulphite fusion process |
| 06/11/1997 | EP0754257A4 Method of enhancing biopulping efficacy |
| 05/28/1997 | EP0775232A1 Low-resident, high-temperature, high-speed chip refining |