| Patents for D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872) |
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| 05/27/2003 | CA2187461C Composition for producing paper and process |
| 05/15/2003 | WO2003040462A1 Microwave pre-treatment of logs for use in making paper and other wood products |
| 05/15/2003 | CA2466505A1 Microwave pre-treatment of logs for use in making paper and other wood products |
| 04/29/2003 | CA2282238C Pulping process |
| 04/22/2003 | US6551462 System for feeding comminuted fibrous material |
| 04/16/2003 | CN1410627A Production technology of pure natural antibacterial bamboo paste |
| 04/16/2003 | CN1410626A Production technology of pure natural antibacterial bamboo paste |
| 04/08/2003 | US6544384 Deaerating comminuted cellulosic fibers and soaking in an alkaline liquid heated to a temperature such that if any acid is formed, the reactions take place slowly enough to be neutralized by the alkali and not damage the fibers |
| 04/02/2003 | CN1407171A Bamboo fibre process |
| 03/18/2003 | US6533896 Method for the production of precleaned pulp |
| 03/12/2003 | CN1102973C Production of prehydrolyzed pulp |
| 03/06/2003 | US20030041985 Method for producing pulp |
| 03/06/2003 | US20030041982 Nitration, separation; fermentation to ethanol |
| 02/20/2003 | WO2003013810A1 Device and method for vacuum impregnation |
| 02/20/2003 | CA2456789A1 Device and method for vacuum impregnation |
| 01/30/2003 | US20030019594 Grass fiber pulp has lighter color than the pulp produced from woods, only need a smaller amount of chemical bleach be added to bleach the pulp to a desired whiteness; papermaking; high strength fibers |
| 01/21/2003 | CA2066336C Atmospheric pre-steaming chip bin vacuum and pressure relief device |
| 01/14/2003 | US6506283 Pretreatment of chips before cooking |
| 01/08/2003 | EP0961851B1 Process for producing fibrous materials with improved properties |
| 01/02/2003 | US20030000661 Removal of water-soluble compounds from wood chips prior to cooking |
| 12/18/2002 | CN1385287A Bamboo pulp denatured productive technology |
| 12/12/2002 | WO2002099183A1 Eucalyptus biomechanical pulping process |
| 12/12/2002 | US20020185176 Pressure vessel for a pulp mill having overflow chute |
| 12/11/2002 | EP1264038A2 Pulping process |
| 12/11/2002 | EP1264037A2 Pulping process |
| 12/05/2002 | DE10126347A1 Production of paper/cardboard fibers uses a biological process stage for the wood chips, using a fungus action to give cellulose, which is processed by chemical precipitation reaction and augmented with additives |
| 11/26/2002 | CA2169108C Continuous cooking with white liquor pretreatment |
| 11/18/2002 | CA2385394A1 Pressure vessel for a pulp mill having overflow chute |
| 11/14/2002 | WO2002090648A1 Feeding arrangement for feeding of chips to chip bins |
| 10/17/2002 | WO2002081816A1 Wood chip treatment |
| 10/17/2002 | US20020148575 Cellulose production from lignocellulosic biomass |
| 10/03/2002 | US20020139496 Prehydrolyzing hardwood chips with water, kraft cooking, bleaching and caustic treatment |
| 09/26/2002 | WO2002075043A1 Method for producing pulp |
| 09/25/2002 | EP1242674A1 Process for preventing scaling of heat transfer surfaces |
| 09/17/2002 | US6451163 Materials handling, storage |
| 09/10/2002 | US6447645 Feeding cellulose material to a treatment vessel |
| 08/29/2002 | US20020119258 System and method for distributing chemicals through a fibrous material using low-headspace dielectric heating |
| 08/22/2002 | WO2002065117A1 Method of selecting wood for mechanical pulping |
| 08/22/2002 | US20020112542 Method of selecting wood for chemical pulping |
| 08/20/2002 | US6436486 Method for distributing chemicals through a fibrous material using low-headspace dielectric heating |
| 08/20/2002 | US6436233 Transferring concentrated pulp at reduced liquid to wood ratio; low temperature minimizing flashing to steam; recycling removed liquid |
| 08/20/2002 | CA2049322C Process for preparing kraft pulp |
| 08/13/2002 | US6432264 Method of making a vessel assembly for handling comminuted cellulosic fibrous material |
| 08/13/2002 | CA2371519A1 Method of selecting wood for chemical pulping |
| 07/24/2002 | EP0823004B1 Impregnation of cellulose-containing material with black liquor in a single vessel digester |
| 07/16/2002 | US6419788 Heating, pressurization |
| 07/11/2002 | US20020088573 Treating the lignocellulose containing material prior to a chemical pulping with chlorine dioxide a delignifying gas |
| 07/11/2002 | US20020088569 Treating the lignocellulose containing material prior to a high-yield pulping, with a delignifying gas such as chlorine dioxide |
| 07/09/2002 | CA2191207C Improved chip feeding for a continuous digester |
| 07/04/2002 | US20020084047 Treating the pulp with a hemicellulase, and chemically modifying the treated pulp, especially by etherification. |
| 07/02/2002 | US6413367 Chelation and steaming cellulose and lignin derivatives containing metal impurities; pulping |
| 07/02/2002 | CA2257041C Bar screen system with attached screens |
| 07/02/2002 | CA2050818C Impregnation with black liquor prior to white liquor introduction |
| 06/13/2002 | US20020069982 Process for producing paper and absorbent products of increased strength |
| 06/13/2002 | US20020069981 Extracting wood particulates with solvent under pressure to reduce pitch and volatile organic compound content without dissolution of lignin and wood cellulose; mixing with liquor having chemical reactants, to react with lignin |
| 06/11/2002 | US6402887 Biopulping industrial wood waste |
| 06/06/2002 | WO2002002866A3 Fungal incubation containment system and methods |
| 06/05/2002 | CN1352716A Method for separating lignocellulose-containing biomass |
| 05/30/2002 | WO2002042551A1 Method for alkaline batch cooking of fiber material |
| 05/30/2002 | WO2002042550A1 Method for alkaline cooking of fiber material |
| 05/30/2002 | US20020062935 Paper and absorbent products with reduced pitch content |
| 05/23/2002 | US20020060024 Feeding comminuted fibrous material |
| 05/23/2002 | US20020059992 Water purification |
| 05/23/2002 | US20020059991 Volume of liquid that is transferred to the High-pressure Feeder is reduced so that more wood chips can be introduced and processed in the digester system being fed per revolution |
| 05/07/2002 | US6383342 Handling fluid streams in cellulose pulp mill; stripping; reboilers |
| 05/01/2002 | CN1083918C Super short period paper making process by using poplar and larch by hot jet and grinding wood to make pulp |
| 04/30/2002 | US6379504 Adding steam and cooking liquor to flow of sawdust to produce heated slurry of sawdust and cooking liquor; passing heated slurry downwardly in static down-flow retention vessel, retaining slurry; cooling |
| 04/23/2002 | US6375795 Minimization of malodorous gas release from a cellulose pulp mill feed system |
| 04/02/2002 | US6364999 Process for producing a wood pulp having reduced pitch content and process and reduced VOC-emissions |
| 03/27/2002 | EP1190137A1 Method for separating lignocellulose-containing biomass |
| 03/26/2002 | US6361649 Method for the continuous cooking of chemical pulp |
| 03/20/2002 | EP1092058A4 Method for selectively delignifying lignocellulosic materials |
| 03/13/2002 | CN1340121A Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 03/07/2002 | US20020026991 Impregnating the material with a solution containing yield or strength-enhancing additive so that no degradation or hydrolysis occurs; treating material with an alkaline cooking liquor produce a chemical cellulose pulp |
| 03/07/2002 | US20020026990 Method and apparatus for pulping sawdust |
| 02/26/2002 | US6350348 Batch cooking with black liquor pretreatment |
| 02/21/2002 | WO2002014599A1 Steaming process |
| 02/21/2002 | WO2002014598A1 Cellulose production from lignocellulosic biomass |
| 02/19/2002 | US6348127 Pulping densified cubes or pellets, for making paper and other fibrous products; kenaf |
| 02/14/2002 | US20020017370 Pretreatment of chips before cooking |
| 02/05/2002 | US6344108 Producing fibrous materials for the manufacture of cellulose, paper, or boards of wood material |
| 01/23/2002 | CN1332818A Kraft wood fibers for carboxyalkyl cellulose |
| 01/10/2002 | WO2002002866A2 Fungal incubation containment system and methods |
| 01/09/2002 | CN1330740A Arundo donax pulp, paper products and particle board |
| 01/09/2002 | CN1077630C Process for producing pulp from lignocellulosic plants and pulp obtained |
| 01/08/2002 | US6336993 Metal removal from comminuted fibrous material during feeding |
| 01/03/2002 | WO2001059203A3 Pulping process |
| 01/03/2002 | WO2001059202A3 Pulping process |
| 12/25/2001 | US6332954 Continuous digester system having a top separator |
| 12/25/2001 | US6332950 Method in connection with the pretreatment of comminuted fibrous material |
| 12/12/2001 | EP1161592A1 Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals |
| 12/06/2001 | US20010047854 Frusto-conical outlet for a cellulose material treatment vessel |
| 12/06/2001 | US20010047853 Materials handling, storage |
| 12/04/2001 | US6325890 Steaming cellulosic material to heat and to remove air, slurrying with cooking liquor, pressurizing with two or more high pressure slurry pumps at location at least thirty feet below top of treatment vessel, transferring to top of vessel |
| 12/04/2001 | US6325889 Producing pulp (cellulose sulfate) with continuous digester system, controlling temperature and alkaline levels |
| 12/04/2001 | US6325888 Method for pulping sawdust |
| 11/27/2001 | CA2114779C Apparatus for supplying steam into a silo |
| 11/27/2001 | CA2114778C Apparatus for steaming a material in a silo |
| 11/21/2001 | CN1323366A Semi alkaline steam explosion treatment of fibrous material for the production of cellulose pulp |
| 11/18/2001 | CA2344845A1 Feeding cellulose material to a treatment vessel |