| Patents for D21C 5 - Other processes for obtaining cellulose, e.g. cooking cotton linters (5,432) |
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| 04/10/1990 | US4915783 Paper recycling aid |
| 04/04/1990 | EP0360993A2 Process for increasing the brightness of waste paper by recirculating neutral water |
| 04/03/1990 | US4913359 Paper material refining apparatus |
| 04/03/1990 | CA1267254A1 Dmdaac/am copolymers as deinkers |
| 03/27/1990 | US4911828 Rejects sorting apparatus |
| 03/20/1990 | US4909900 Concurrent heating, bleaching; forcing mixture through narrow slots |
| 03/06/1990 | CA1266354A1 Process for manufacturing a liquid absorbing pad, in particular for use in soft hygiene articles and sanitary products |
| 02/28/1990 | CN1006992B Process for manufacturing soft hygiene articles and sanitary products |
| 02/27/1990 | CA1266152A1 Process for producing high yield bleached cellulose pulp |
| 02/20/1990 | CA1266014A1 Direct biological bleaching of hardwood kraft pulp with the fungus coriolus versicolor |
| 02/07/1990 | CN1039458A Method for separating short cotton fibres from cottenseed shells |
| 01/24/1990 | EP0351655A1 A method for the treatment of pulp |
| 01/18/1990 | DE3823847A1 A process for de-inking printed waste paper |
| 01/17/1990 | CN1038849A Method of preparing pulp |
| 01/10/1990 | EP0349806A2 Apparatus for treating waste paper |
| 12/28/1989 | WO1989012716A1 Process and apparatus for the manufacture of pulp for paper, board, fiberboard and similar products |
| 12/13/1989 | EP0345715A1 Enzymatic delignification of lignocellulosic material |
| 12/12/1989 | US4886575 Detackification of adhesive materials contained in secondary fiber with polyvinyl alcohol |
| 11/23/1989 | EP0342857A2 Waste paper de-inking system |
| 11/16/1989 | WO1989010999A1 Method for deinking wastepaper |
| 11/09/1989 | DE3809413C1 Manufacture of light mouldings from lignocellulose-containing plant material by means of lignolytic microorganisms |
| 10/11/1989 | EP0228396B1 Arrangement for the flocculation of flocculable substances, particularly for the purification of effluents from deinking installations for used paper processing |
| 10/10/1989 | US4872953 Apparatus for improving the quality of paper manufactured from recycled paper with a hydrokinetic amplifier |
| 10/04/1989 | EP0335260A2 Flotation process for de-inking waste printed paper |
| 09/27/1989 | EP0334739A1 Process for manufacturing papers and boards from recycled fibres which have been treated with enzymes |
| 09/21/1989 | DE3808152A1 Method for pulping waste paper or cellulose with removal of contraries |
| 09/12/1989 | US4865690 Process and plant for recycling waste printed papers |
| 08/29/1989 | US4861165 Method of and means for hydrodynamic mixing |
| 08/16/1989 | EP0327576A1 Process for producing cellulose from lignin-containing raw materials. |
| 08/15/1989 | US4857145 Process for making a pulp from bamboo |
| 06/27/1989 | US4842777 Pressurized mixing injector |
| 05/16/1989 | US4831127 Hydrolysis, shearing |
| 05/16/1989 | US4830708 Incubation |
| 05/11/1989 | DE3736335A1 Process for the preparation of chemical woodpulp, chemical woodpulp prepared by this process, and process for further processing of this chemical woodpulp |
| 05/03/1989 | EP0209533B1 Process and system for the flocculation substances which can be flocculated in suspensions, especially for cleaning the discharge water of deinking plant |
| 04/19/1989 | EP0202237B1 A process for manufacturing a liquid absorbing pad, in particular for use in soft hygiene articles and sanitary products |
| 04/19/1989 | CN2036189U Waste paper decolouration and flotation machine |
| 04/11/1989 | US4820379 Slurrying, agglomeration, separation; computer, zerography wastes |
| 03/28/1989 | US4816117 Impregnation, decomposition in storage tank, high consistency stock method |
| 03/21/1989 | US4814440 Process for producing extractive-material-reduced cellulose |
| 03/15/1989 | EP0307024A1 De-inking agent for waste paper |
| 03/09/1989 | DE3728474A1 Recyclable paper, and process for the production and recycling thereof |
| 03/01/1989 | EP0305251A1 Injector mixer under pressure |
| 02/14/1989 | CA1249903A1 Composition and method of deinking of recycled cellulosic material |
| 02/08/1989 | EP0302166A1 Process for separating fillers from paper mill water circuits by flotation |
| 02/07/1989 | CA1249783A1 Use of ligninolytic enzymes |
| 01/25/1989 | CN1030624A Bamboo as pulp making fiber |
| 01/18/1989 | EP0299138A1 Process for separating fillers from waste paper by flottation |
| 12/28/1988 | EP0211834B1 Aeration installation |
| 12/14/1988 | EP0295063A2 Lignin-degrading microorganism having high activity and selectivity |
| 11/22/1988 | US4786364 Diallyldimethylammonium chloride-acrylonitrile, cellulose fibers |
| 11/17/1988 | EP0291142A1 A method of obtaining usable fibrous material with the aid of micro-organisms from paper and particularly laminated paper |
| 11/15/1988 | US4784764 Arrangement for the flocculation of flocculatable substances in suspensions, particularly for the purification of the backwater of deinking installations for waste paper processing |
| 11/01/1988 | US4781794 Detackification of adhesive materials contained in secondary fiber |
| 10/25/1988 | US4780179 Method for producing pulp from printed unselected waste paper |
| 10/11/1988 | US4776926 Thinning, agitation, separation into fine and long fiber fractions of varying freeness |
| 10/11/1988 | CA1242872A1 Well drilling and production fluids employing parenchymal cell cellulose |
| 09/28/1988 | EP0284526A1 Process and plant for recycling waste printed papers |
| 08/17/1988 | EP0278260A2 Screening apparatus |
| 08/10/1988 | EP0277570A2 Process for deinking printed waste paper |
| 07/27/1988 | EP0275256A1 Method of processing waste paper. |
| 07/26/1988 | CA1239506A1 Recycling process of waste papers |
| 07/19/1988 | CA1239255A1 Process for reducing discoloration and/or tackiness in processing waste paper fibers |
| 06/23/1988 | DE3741583A1 Method for destroying microbes in process water of paper-mills |
| 06/22/1988 | CN87107426A Pressurized flotation modules and method for pressurized foam separation |
| 06/15/1988 | EP0271427A2 Pressurized flotation module and method for pressurized foam separation |
| 06/14/1988 | CA1237929A1 Flotation apparatus for flotation of fibrous stock suspension recovered from waste paper |
| 06/07/1988 | US4749473 Slurrying, air blowing, absorption, froth removal |
| 05/18/1988 | CN87107484A Size treatment technology and apparatus for fuzz fibres |
| 05/05/1988 | WO1988003190A1 Process for producing cellulose from lignin-containing raw materials |
| 05/05/1988 | DE3636208A1 Verfahren zur delignifizierung und bleichung von lignicellulosehaltigem bzw. ligninhaltigem material bzw. lignin durch enzymatische behandlung Process for the delignification and bleaching of lignocellulosic material or lignicellulosehaltigem or lignin by enzymatic treatment |
| 04/12/1988 | US4737238 Screening, dehydration, and delignification |
| 04/12/1988 | CA1235013A1 Process for dry deinking of secondary fiber sources |
| 04/06/1988 | EP0262553A2 Process for treating cellulosic raw materials |
| 04/05/1988 | US4735682 Repulping by agitation in aqueous alkaline solution; defibering; reuse; papermaking |
| 03/30/1988 | EP0262040A1 Process for treating a paper pulp with an enzymatic solution |
| 03/23/1988 | EP0261025A1 Process and apparatus for treating printed waste paper |
| 03/02/1988 | CN87105652A Method of and means for hydrodynamic mixing |
| 02/24/1988 | EP0256965A2 Method of and means for hydrodynamic mixing |
| 02/23/1988 | US4726897 Flotation container or cell |
| 02/23/1988 | US4726880 Method and apparatus for improving the quality of paper manufactured from recycled paper with a hydrokinetic amplifier |
| 02/09/1988 | US4724045 Pulp decolor process |
| 02/02/1988 | US4722784 Fiber suspensions; contaminants in froth on surface carried off |
| 01/26/1988 | US4721562 Aerating apparatus |
| 01/19/1988 | US4719772 Apparatus for removing ink particles from paper products |
| 12/29/1987 | CA1230709A1 Procedure for producing refined groundwood pulp |
| 12/08/1987 | CA1229955A1 Method for producing pulp stock for paper making from printed unselected waste paper |
| 12/02/1987 | EP0247307A1 Process for decolourizing papers, coloured in the mass, and carbonless copying papers |
| 12/01/1987 | US4710267 Process for reducing discoloration and/or tackiness in processing waste paper fibers |
| 12/01/1987 | CA1229702A1 Methods of decontaminating secondary fiber |
| 11/05/1987 | WO1987006609A1 Decomposition of lignocellulose |
| 11/04/1987 | EP0244262A1 Decomposition of lignocellulose |
| 11/04/1987 | EP0243690A2 Flotation tank or cell |
| 10/27/1987 | CA1228558A1 Parenchymal cell cellulose and related materials |
| 10/14/1987 | EP0241224A2 Deinking composition for reclamation of waste paper |
| 10/06/1987 | US4698133 Water soluble methyl cellulose |
| 09/11/1987 | WO1987005346A1 High temperature, high consistency bleaching |
| 09/08/1987 | US4692413 Removal of lignin from wood pulp produced in the kraft process |
| 09/01/1987 | US4690895 Use of rLDM™ 1-6 and other ligninolytic enzymes in the bleaching of kraft pulp |
| 08/26/1987 | EP0233517A2 Process and apparatus for deinking paper pulp obtained from waste paper |