| Patents for D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872) |
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| 08/18/1994 | WO1994018383A1 Method of preparing chemi-mechanical pulp |
| 08/17/1994 | EP0454757B1 A method in the manufacture of cellulose pulp |
| 08/16/1994 | US5338405 Production of fiber pulp by impregnating the lignocellulosic material with an aqueous alcoholic SO2 solution prior to defibration |
| 08/16/1994 | US5338366 Biomass |
| 08/10/1994 | CN1090616A Pulping method |
| 08/03/1994 | EP0608949A1 Process for the preparation of moisture resistant vegetable fibres |
| 07/26/1994 | CA2114042A1 Process for the preparation of moisture resistant vegetable fibres |
| 07/12/1994 | US5328562 Process for preparing a hydrolysed lingnocellulosic material |
| 06/09/1994 | WO1994012719A1 Viscose production process |
| 05/28/1994 | CA2109749A1 Method of controlling biotechnological pulp and paper processing using noble gases |
| 05/24/1994 | US5314583 Process for the comminution of materials and plant for carrying out the process |
| 05/11/1994 | EP0502848B1 Disk screen with compressible spacers and flanged surrounds |
| 04/28/1994 | WO1994009057A1 Process for the modification of lignocellulosic material in vapour phase |
| 04/13/1994 | CN1085281A Method for mfg. bank-note paper with banana fiber |
| 04/12/1994 | CA1328366C Wood chip cracking apparatus |
| 04/05/1994 | US5300195 Continuous vertical digester apparatus |
| 03/29/1994 | US5298120 Composition for enhancing the pulping of wood chips |
| 02/22/1994 | CA1327104C Method of preparing a pulp |
| 01/12/1994 | EP0578305A1 Process of delignification of a chemical pulp |
| 01/12/1994 | EP0578303A1 Process for the delignification of a chemical paper pulp |
| 01/07/1994 | CA2099828A1 Delignification process for chemical pulp |
| 01/07/1994 | CA2099513A1 Delignification process for chemical pulp |
| 11/24/1993 | EP0570492A1 Self-loading, controlled deflection roll. |
| 11/02/1993 | CA1323790C Continuous cooking pulp quality enhancements |
| 10/14/1993 | CA2065939A1 Steam explosion pulping process for annual plants papermaking |
| 10/12/1993 | CA1322827C Process and equipment for pretreatment of cellulosic raw-material |
| 09/28/1993 | CA1322485C Vertical steaming vessel |
| 09/21/1993 | CA1322366C Continuous leaching of lignin or hemicellulose and lignin from steam pretreated lignocellosic particulate material |
| 09/20/1993 | CA2063547A1 Steam explosion pulping process for papermaking |
| 09/07/1993 | CA1321915C Cyclical impregnation during mechanical pulping |
| 08/04/1993 | EP0553649A1 Process for delignifying a cellulose pulp |
| 08/01/1993 | CA2088281A1 Process for delignifying raw cellulose |
| 06/01/1993 | US5215559 Device for separating fibres and gas |
| 05/25/1993 | US5213662 Treatment of chips with high temperature black liquor to reduce black liquor viscosity |
| 05/04/1993 | US5207870 Process and equipment for pretreatment of cellulosic raw material |
| 04/06/1993 | US5199476 Treatment of wood chips |
| 03/30/1993 | US5198075 Digestion method and installation with preheating of lignocellulose materials in solid phase |
| 03/30/1993 | US5198074 Process to produce a high quality paper product and an ethanol product from bamboo |
| 03/23/1993 | CA1314844C Automatic chip classifier and system |
| 03/17/1993 | EP0531609A1 Atmospheric pre-steaming chip bin vacuum and pressure relief device |
| 03/09/1993 | US5192396 Process for the continuous digestion of cellulosic fiber material |
| 03/04/1993 | WO1993004232A1 A process for the continuous digestion of cellulosic fiber material |
| 03/04/1993 | CA2115578A1 A process for the continuous digestion of cellulosic fiber material |
| 02/17/1993 | EP0527294A1 Treatment of chips with black liquor |
| 02/15/1993 | CA2068165A1 Treatment of chips with black liquor |
| 02/02/1993 | US5183535 Process for preparing kraft pulp using black liquor pretreatment reaction |
| 12/30/1992 | CN1019644B Procedure and apparatus for sorting of wood chips |
| 12/20/1992 | CA2044967A1 Process to obtain a molding pulp starting from short fiber cellulose |
| 12/08/1992 | US5169498 Atmospheric pre-steaming chip bin vacuum and pressure relief device |
| 12/08/1992 | CA1311093C Cellulosic matter delignification process |
| 11/17/1992 | US5164042 Low energy process results in paper with better printability |
| 09/29/1992 | CA1308096C Porphyrins, their syntheses and uses thereof |
| 09/02/1992 | EP0501059A1 Steam explosion pulping process for papermaking |
| 09/02/1992 | EP0500674A1 A method of producing cellulosic pulp |
| 09/02/1992 | CN1064117A Method for feeding continuous cookers under pressure for obtaining cellulose pulp |
| 08/29/1992 | CA2037275A1 Steam explosion pulping process for papermaking |
| 08/21/1992 | CA2060043A1 Surfactants as kraft pulping additives for reject reduction and yield increase |
| 08/12/1992 | EP0498330A1 Process for the delignification of fibrous plant material |
| 08/07/1992 | CA2060798A1 Process for the delignification of cellulosic fibre raw materials |
| 08/05/1992 | WO1992013997A1 Self-loading, controlled deflection roll |
| 07/28/1992 | US5133507 Procedure and apparatus for the sorting of wood chips |
| 07/08/1992 | CN1062564A Technology for producing semi-chemical pulp of tobacco stalk with sulfite |
| 06/18/1992 | WO1992011409A1 Method for supplying pressurized continuous digesters to obtain cellulose pulp |
| 06/18/1992 | CA2098493A1 Method for supplying pressurized continuous digesters to obtain cellulose pulp |
| 06/09/1992 | CA1302764C Method of preparing a pumpable slurry |
| 05/26/1992 | CA1301412C Method in the activation of lignocellulosic material with a gas containing nitrogen dioxide |
| 05/12/1992 | US5111563 Self-loading, controlled deflection roll |
| 04/29/1992 | CN1060689A Hot spraying slurrying technology |
| 03/26/1992 | CA2026102A1 Non-sulfur process for preparing pulp for paper making |
| 03/25/1992 | EP0477059A2 Impregnation with black liquor prior to white liquor introduction |
| 03/11/1992 | CA2024935A1 Modified process for preparing pulp for paper making |
| 03/04/1992 | EP0472820A2 Continuous solvent pulping and washing processes and apparatus |
| 02/18/1992 | CA2042885A1 Continuous solvent pulping and washing processes and apparatus |
| 02/12/1992 | EP0470929A2 New fungi for pitch reduction, their preparation and use |
| 02/04/1992 | CA1295095C Process for the production of a hemicellulose hydrolysate and special pulp |
| 02/01/1992 | CA2047900A1 Fungi for pitch reduction, their preparation and use |
| 01/29/1992 | EP0468016A1 Process for preparing kraft pulp. |
| 01/22/1992 | EP0466798A1 Device for separating fibres and gas |
| 01/14/1992 | US5080755 Process for the continuous digestion of cellulosic fiber material |
| 01/07/1992 | US5078274 Method and apparatus for wood chip sizing |
| 11/13/1991 | EP0456555A1 Digesting process and apparatus with preheating of lignocellulosic material |
| 11/08/1991 | CA2040998A1 Cooking process and plant with solid phase lignocellulose preheating |
| 11/06/1991 | EP0454757A1 A method in the manufacture of cellulose pulp. |
| 10/08/1991 | US5055159 Biomechanical pulping with C. subvermispora |
| 09/11/1991 | EP0445143A1 Device for chip washing |
| 08/22/1991 | WO1991012368A1 Process for preparing kraft pulp |
| 08/21/1991 | EP0442806A1 A process for producing pulp from a lignocellulosic-containing material |
| 08/21/1991 | EP0442222A1 Method and apparatus for wood chip sizing |
| 08/20/1991 | CA1287705C Process for preparing pulp for paper making |
| 08/13/1991 | CA2036311A1 Process for producing pulp from a lignocellulosic-containing material |
| 08/06/1991 | US5037537 Wood particle screen |
| 07/23/1991 | CA1286455C High yield chemical pulping |
| 07/03/1991 | EP0434696A1 Method of making chemi-mechanical pulp from hardwood |
| 05/30/1991 | WO1991008058A1 Disk screen with compressible spacers and flanged surrounds |
| 05/07/1991 | WO1991006700A1 A method of producing cellulosic pulp |
| 05/07/1991 | CA2073048A1 Method of producing cellulosic pulp |
| 04/25/1991 | WO1991006380A1 Wood particle screen |
| 04/16/1991 | CA1282911C Delignification process for ligno-cellulosic materials |
| 04/11/1991 | DE3932347A1 Herstellung chemo-mechanischer und/oder chemo-thermo-mechanischer holzstoffe Chemo-mechanical preparation and / or chemo-thermo-mechanical wood materials |
| 03/29/1991 | WO1991005102A1 Process for manufacturing chemo-mechanical and/or chemo-thermo-mechanical wood pulps |