| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 08/29/1989 | CA1258898A1 Contaminant detection in paper pulp |
| 08/22/1989 | US4859283 Delignification, bleaching to form edible materials |
| 08/22/1989 | US4859282 Acidification with aqueous mineral or organic acid |
| 08/16/1989 | EP0327784A1 Means and method for removal of strings |
| 08/16/1989 | EP0327576A1 Process for producing cellulose from lignin-containing raw materials. |
| 08/08/1989 | US4855038 High consistency pressure screen and method of separating accepts and rejects |
| 08/02/1989 | EP0325891A1 Process for obtaining bleached cellulose pulp |
| 08/02/1989 | EP0325890A1 Process for treating lignin containing cellulose pulp with ozone |
| 08/02/1989 | EP0325731A1 Process for producing semi-bleached Kraft cellulose pulp |
| 08/01/1989 | US4853086 Hydrophilic cellulose product and method of its manufacture |
| 08/01/1989 | US4853082 Process for the activation and delignification of cellulose pulp |
| 07/26/1989 | EP0325498A1 Apparatus for loading and unloading a reel for treating bulk material in layers |
| 07/12/1989 | EP0323749A2 Method and means for facilitating the discharge of a drop leg or the like and treating pulp in said space |
| 07/11/1989 | US4846933 Process for controlling pitch deposition from pulp in papermaking systems |
| 07/05/1989 | CN1033664A Method of manufacturing paper pulp |
| 07/05/1989 | CN1033663A Production of flame resisting safety powder |
| 06/27/1989 | US4842690 Mixing chlorine gas into paper pulp slurries |
| 06/20/1989 | US4840704 Controlling characteristics of a pulp mat on a pulp washing surface |
| 06/20/1989 | US4840703 Method for controlling an oxygen bleaching |
| 06/20/1989 | US4840047 Multiscreen pressure diffuser |
| 06/20/1989 | CA1256223A1 Foam controller |
| 06/20/1989 | CA1255949A1 Washing of papermaking pulp stock |
| 06/14/1989 | EP0319563A1 Process for bleaching of materials with a dithionite solution. |
| 06/13/1989 | US4838995 Process for bleaching cellulose pulp, a plant for preforming said process, and a screw press for use with said process and plant |
| 06/13/1989 | CA1255609A1 Solids-liquids separation device |
| 06/07/1989 | EP0318569A1 Process and installation for industrial production of stabilized aggregates. |
| 06/06/1989 | US4836892 Pulp blends for linerboards |
| 06/06/1989 | CA1255237A1 Method in thickening a fiber suspension in a thickening apparatus |
| 05/31/1989 | EP0317921A1 Bleaching agent additive |
| 05/31/1989 | EP0317771A1 Effective diffuser/thickener screen backflushing |
| 05/30/1989 | US4834837 Method for delignification of cellulose with oxygen |
| 05/30/1989 | US4834547 Apparatus for mixing chemicals in fibre suspensions |
| 05/17/1989 | EP0315737A1 Method and apparatus for treating pulp |
| 05/16/1989 | US4830708 Incubation |
| 05/16/1989 | CA1254153A1 Method for dewatering a fiber suspension in a dewatering apparatus |
| 05/09/1989 | US4827741 Pulp washer discharging a pulp slurry at a controlled consistency |
| 05/05/1989 | WO1989003910A1 Interstage treatment of mechanical pulp |
| 04/26/1989 | EP0313478A1 Process for bleaching pulps |
| 04/25/1989 | CA1253114A1 Preservation of viscosity during electrochemically promoted oxygen bleaching of lignocellulose |
| 04/20/1989 | WO1989003451A1 Method at bleaching cellulose pulp |
| 04/18/1989 | US4822826 Composite material and method of manufacturing same |
| 04/18/1989 | US4822453 Cellulosic fibers; dialdehydes or aldehyde containing analogs |
| 04/18/1989 | US4821536 Rotating drum end seal |
| 04/12/1989 | EP0311356A1 Process for bleaching mechanical pulp |
| 04/12/1989 | EP0311013A2 Chlorine dioxide oxidation of mill effluent color |
| 04/11/1989 | CA1252258A1 Method of brown stock washing |
| 04/06/1989 | WO1989002952A1 Market paper pulp, process for making market paper pulp and use of such pulp in papermaking |
| 04/05/1989 | EP0309998A2 A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide |
| 04/04/1989 | CA1251978A1 Fibrous webs of enhanced bulk and method of manufacturing same |
| 04/04/1989 | CA1251904A1 Method for producing improved high-yield pulps |
| 04/04/1989 | CA1251903A1 Alkaline-peroxide-oxygen treatment of unbleached and chlorinated chemical pulps |
| 03/22/1989 | EP0308314A1 Process for the ozone treatment of lignocellulosic materials, in particular paper pulps, and reactor for carrying out this process |
| 03/21/1989 | US4814440 Process for producing extractive-material-reduced cellulose |
| 03/15/1989 | EP0307295A1 Process for producing a bleached paper pulp comprising a carbon dioxide treatment after bleaching |
| 03/14/1989 | US4812206 Process for bleaching lignocellulosic matter |
| 03/14/1989 | US4811908 Method of fibrillating fibers |
| 03/08/1989 | EP0305394A1 Arrangement for liquid treatment of pulp. |
| 03/07/1989 | US4810328 Nonionic surfactant, polyelectrolyte |
| 03/07/1989 | CA1250702A1 System and process for sulfonating mechanical pulp fibers |
| 02/28/1989 | US4808310 Apparatus for liquid treatment of pulp with vapor separation |
| 02/28/1989 | US4808265 Forming wood pulp mat on rotating permeable drum |
| 02/28/1989 | CA1250480A1 Method and device in connection with continuous pulp cooking |
| 02/28/1989 | CA1250404A1 Membrane pervaporation process |
| 02/22/1989 | EP0303962A2 Oxygen alkali extraction process for producing bleached pulp |
| 02/21/1989 | US4806203 Method for alkaline delignification of lignocellulosic fibrous material at a consistency which is raised during reaction |
| 02/14/1989 | US4804440 Multistage brightening of high yield and ultra high-yield wood pulps |
| 02/14/1989 | US4804439 Means and method for removal of strings from waste paper |
| 02/14/1989 | US4804384 Acetylation of lignocellulosic materials |
| 02/14/1989 | CA1249904A1 Oxygen alkali extraction of cellulosic pulp |
| 02/08/1989 | EP0302110A1 Process for production of cellulose pulp and/or delignification of secondary fibers |
| 02/07/1989 | US4802953 Continuous on-line conductivity probe |
| 02/07/1989 | CA1249783A1 Use of ligninolytic enzymes |
| 02/01/1989 | EP0301024A1 Dewatering press. |
| 02/01/1989 | EP0301023A1 Apparatus for liquid treatment of pulp. |
| 01/31/1989 | US4801353 Use of chlorous acid for bleaching wood pulp |
| 01/31/1989 | CA1249584A1 Method for preparation of cationic cellulose |
| 01/31/1989 | CA1249404A1 Method and device for delignification of cellulose with oxygen |
| 01/31/1989 | CA1249403A1 Brightening of high yield and ultra high yield pulps |
| 01/31/1989 | CA1249402A1 Multistage brightening of high yield and ultra high- yield wood pulps |
| 01/25/1989 | EP0300251A2 Method and apparatus for pumping high consistency pulp |
| 01/24/1989 | US4799995 Polyaminopolyalkylenephosphonic acid |
| 01/24/1989 | US4799994 Process for cooking and bleaching pulp |
| 01/24/1989 | CA1249107A1 Latex treated cationic cellulose product and method for its preparation |
| 01/17/1989 | US4798652 Peroxide bleaching of mechanical pulps |
| 01/17/1989 | CA1248710A1 Bleaching of cellulosic material |
| 01/11/1989 | EP0298499A1 Method and apparatus for thickening fiber suspension |
| 01/10/1989 | USRE32825 Process for the electrochemical reductive bleaching of lignocellulosic pulp |
| 01/05/1989 | DE3820160A1 Concentrate and use thereof as stabiliser for alkaline peroxide-containing liquors |
| 01/04/1989 | EP0297464A2 Method and apparatus for pumping high consistency fiber suspension |
| 01/03/1989 | US4795558 Shower pipes for rotary drum filter |
| 01/03/1989 | CA1247908A1 Apparatus for liquid treatment of pulp |
| 12/29/1988 | WO1988010334A1 Process for bleaching of materials with a dithionite solution |
| 12/29/1988 | WO1988010184A1 Process and installation for industrial production of stabilized aggregates |
| 12/29/1988 | DE3819861A1 Discharge device |
| 12/28/1988 | EP0296198A1 Method for washing of alcaline pulp. |
| 12/27/1988 | US4793898 Predefibering lignocellulose with peroxy(formic or acetic)acid |
| 12/27/1988 | US4793161 Pulp treating apparatus |
| 12/15/1988 | WO1988009842A1 A method of reducing chlorophenol compounds in the chlorine bleaching of pulp |
| 12/14/1988 | EP0295180A2 Process for bleaching or delignification of a cellulose pulp with oxygen, and plant for carrying out the process |
| 12/13/1988 | CA1246304A1 Process and apparatus for bleaching of pulp |