| Patents for D21C 1 - Pretreatment of the finely-divided materials before digesting (1,872) |
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| 05/02/1997 | EP0683830B1 Method of preparing chemi-mechanical pulp |
| 04/29/1997 | US5624616 Heating waste chips under steam and pressure to soften lignin, comminuting, drying |
| 04/15/1997 | US5620564 Cutting wood into chip; inoculating with ceriporiopsis and nutrients |
| 04/10/1997 | WO1997013025A1 Method for improving the efficiency of chemical pulping processes by pretreating wood or pulpwood with white rot fungi |
| 04/10/1997 | CA2233046A1 Method for improving the efficiency of chemical pulping processes by pre-treatment with white rot fungi |
| 04/02/1997 | CN1146512A Wave pressure pulping pollution-free paper-making technology |
| 03/19/1997 | EP0763622A2 Continuous solvent pulping and washing processes and apparatus |
| 03/11/1997 | US5609724 Fungi for pitch reduction and their preparation |
| 02/19/1997 | CN1143398A Impact of temperature and alkali charge on pulp brightness |
| 01/30/1997 | WO1997003244A1 Impregnation of fiber material |
| 01/30/1997 | WO1997003243A1 Impregnation of fibre material |
| 01/22/1997 | EP0754257A1 Method of enhancing biopulping efficacy |
| 01/15/1997 | EP0753054A1 Expansins, proteins that catalyze plant cell wall expansion and weakening of paper fiber connections |
| 01/15/1997 | CN1140215A Method for making multipurpose pulp from waste tobacco stalks, stems and leaves |
| 01/14/1997 | US5593544 Pulp production |
| 01/08/1997 | CN1033765C Method for mfg. bank-note paper with banana fiber |
| 01/01/1997 | CN1139464A Production of prehydrolyzed pulp |
| 12/31/1996 | US5589033 Production of prehydrolyzed pulp |
| 12/27/1996 | WO1996041914A1 Low-resident, high-temperature, high-speed chip refining |
| 12/27/1996 | WO1996041894A1 Bubble apparatus for removing and diluting dross in a steel treating bath |
| 12/24/1996 | US5587049 Low temperature; recirculation of liquids |
| 12/18/1996 | EP0748412A1 Impact of temperature and alkali charge on pulp brightness |
| 12/10/1996 | US5582352 Improving the quality by supplying oxygen and/or hydrogen peroxide |
| 12/03/1996 | CA2101255C Self-loading, controlled deflection roll |
| 11/06/1996 | EP0672207B1 Viscose production process |
| 11/06/1996 | EP0662169B1 A process for the continuous digestion of cellulosic fiber material |
| 11/05/1996 | US5571378 Removing transition metals from kraft pulp |
| 10/31/1996 | WO1996034143A1 Impregnation of cellulose-containing material with black liquor in a single vessel digester |
| 10/31/1996 | CA2217568A1 Impregnation of cellulose-containing material with black liquor in a single vessel digester |
| 10/24/1996 | WO1996033309A1 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 |
| 10/24/1996 | CA2217874A1 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 |
| 10/15/1996 | US5564198 Apparatus for supplying steam into a silo |
| 10/09/1996 | EP0688373B1 Process to produce chemi-mechanical pulp and/or chemi-thermo-mechanical pulp |
| 09/17/1996 | US5555646 Apparatus for steaming a material in a silo |
| 09/04/1996 | CN1032705C Double side smooth thickened board paper and its producing method |
| 09/03/1996 | US5552018 Stabilized peroxyacid with phosphonic acids and salts for lignin removal |
| 08/14/1996 | EP0468016B1 Process for preparing kraft pulp |
| 06/25/1996 | US5529661 Process for controlling the flow of cellulosic fiber material through an impregnation vessel |
| 06/12/1996 | EP0715657A1 Prehydrolysis of lignocellulose |
| 04/17/1996 | EP0570385B1 Method for supplying pressurized continuous digesters to obtain cellulose pulp |
| 04/02/1996 | US5503996 Prehydrolysis of lignocellulose |
| 03/28/1996 | WO1996009432A1 Method and apparatus for the continuous production of cellulosic pulp |
| 03/28/1996 | CA2208264A1 Method and apparatus for the continuous production of cellulosic pulp |
| 03/26/1996 | US5501769 For papermaking |
| 03/19/1996 | US5500084 Method and apparatus for pulping cellulosic material using a vessel with an impergnation zone and an attrition zone |
| 03/07/1996 | WO1996006974A1 Sulphite fusion process |
| 03/07/1996 | CA2198485A1 Sulphite pulping process |
| 02/22/1996 | WO1996005362A1 Method of enhancing biopulping efficacy |
| 01/17/1996 | CN1030725C Method of preparing pulp |
| 01/09/1996 | CA2072661C Wood particle screen |
| 01/03/1996 | EP0689625A1 Pitch degradation with white rot fungi |
| 12/27/1995 | EP0688373A1 Process to produce chemi-mechanical pulp and/or chemi-thermo-mechanical pulp |
| 12/26/1995 | US5478439 Method for feeding cellulose pulp mixture to a pressurized continuous digester |
| 12/21/1995 | WO1995034712A1 Improved chip feeding for a continuous digester |
| 12/19/1995 | US5476790 Inoculation with schizophyllum trichaptum and phanerochaete |
| 12/19/1995 | US5476789 Composition containing strains of Ophiostoma piliferum and a method of using the composition to reduce the pitch content of pulpwood or pulp |
| 12/19/1995 | US5476572 Chip feeding for a continuous digester |
| 11/30/1995 | WO1995032331A1 Sulphidic impregnation of chips for alkaline pulping |
| 11/29/1995 | EP0683830A1 Method of preparing chemi-mechanical pulp. |
| 11/28/1995 | US5470433 Process for the delignification of cellulose fiber raw materials using alcohol and alkali |
| 11/07/1995 | CA2069504C Disk screen with compressible spacers and flanged surrounds |
| 10/25/1995 | EP0439493B1 Wood chip cracking apparatus |
| 10/24/1995 | US5460697 Method of pulping wood chips with a fungi using sulfite salt-treated wood chips |
| 10/10/1995 | US5456799 Method for controlling activation of lignocellulosic material in the presence of a nitrate containing liquid |
| 10/03/1995 | US5454911 Apparatus for hydrolyzing and drying lignocellulosic material |
| 09/20/1995 | EP0672207A1 Viscose production process. |
| 09/08/1995 | WO1995023891A1 Impact of temperature and alkali charge on pulp brightness |
| 08/17/1995 | WO1995021961A1 Method for optimizing the liquor-to-wood ratio when producing paper pulp |
| 08/09/1995 | EP0494214B1 Process for manufacturing chemo-mechanical and/or chemo-thermo-mechanical wood pulps |
| 07/27/1995 | WO1995020065A1 Production of prehydrolyzed pulp |
| 07/18/1995 | US5433825 Method for pulping wood chips separate alkali and peroxymonosulfate treatments |
| 07/12/1995 | EP0662169A1 A process for the continuous digestion of cellulosic fiber material. |
| 07/11/1995 | US5431781 Process for the delignification of a chemical paper pulp with organic peroxy acid |
| 07/04/1995 | CA1336181C Procedure and apparatus for the sorting of wood chips |
| 06/22/1995 | DE4343508A1 Prodn. of cellulose from fibrous plant material by loosening |
| 06/14/1995 | EP0363379B1 Porphyrins, their syntheses and uses thereof |
| 06/13/1995 | US5424417 Heating in flow-through reactor with dilute acidic liquid, withdrawing liquor, recovering, removing solid material |
| 05/24/1995 | CA2135742A1 Process for high-ph metal ion chelation in pulps |
| 04/06/1995 | WO1995009267A1 Pretreatment of chips |
| 04/04/1995 | US5403442 Pumping with deaerating centrifugal pump controls foaming on heat exchanging evaporator surfaces |
| 03/30/1995 | WO1995008648A1 Prehydrolysis of lignocellulose |
| 02/07/1995 | CA1334240C Method of making chemi-mechanical pulp from hardwood |
| 01/31/1995 | CA2121095A1 Process for removing chemical preservatives from wood using supercritical fluid extraction |
| 01/26/1995 | WO1995002726A1 Pulp production |
| 01/25/1995 | CN1097825A Method for producing double side smooth thickened board paper |
| 12/07/1994 | EP0570492B1 Self-loading, controlled deflection roll |
| 11/24/1994 | WO1994026878A1 Expansins, proteins that catalyze plant cell wall expansion and weakening of paper fiber connections |
| 11/24/1994 | DE4316861A1 Application of a method of high-pressure steam treatment |
| 11/24/1994 | CA2162721A1 Expansins, proteins that catalyze plant cell wall expansion and weakening of paper fiber connections |
| 11/15/1994 | US5364475 Process for removing chemical preservatives from wood using supercritical fluid extraction |
| 10/26/1994 | CN1094108A Method for producing solvable pulp |
| 10/18/1994 | CA1332526C Process for the continuous digestion of cellulosic fiber material |
| 09/29/1994 | WO1994021854A1 Pitch degradation with white rot fungi |
| 09/29/1994 | CA2152958A1 Pitch degradation with white rot fungi |
| 09/15/1994 | WO1994020670A1 Process for producing chemomechanical and/or chemothermomechanical wood products |
| 09/15/1994 | CA2157886A1 Process for producing chemomechanical and/or chemothermomechanical wood products |
| 09/13/1994 | US5346591 Apparatus for treatment of chips with heated black liquor |
| 08/24/1994 | EP0611845A1 Apparatus for supplying steam into a silo |
| 08/24/1994 | EP0611844A1 Apparatus for steaming a material in a silo |
| 08/24/1994 | EP0496748B1 Wood particle screen |