| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 06/13/1990 | EP0373108A2 Process for bleaching pulp |
| 06/13/1990 | EP0373107A2 Use of enzymes of Aureobasidium pullulans in pulp bleaching |
| 06/13/1990 | EP0250422B1 Process for preparing bleached pulp from lignocellulosic raw material |
| 06/12/1990 | US4933801 Ground fault circuit interrupter |
| 06/06/1990 | CA2002857A1 Cold blow system for batch production of pulp |
| 06/05/1990 | CA1269805A1 Hypochlorite treatment of chemical paper pulp |
| 05/25/1990 | CA2003769A1 Apparatus for continuous processing of pulp |
| 05/23/1990 | EP0369711A2 Phosphate composition and uses thereof |
| 05/23/1990 | EP0369611A2 Apparatus for thickening pulp and paper stock |
| 05/23/1990 | EP0369073A1 Paper-making material deposition apparatus |
| 05/23/1990 | EP0258352B1 High temperature, high consistency bleaching |
| 05/23/1990 | CN1042388A Process and apparatus for manufacture of plup for paper, board, fiberboard and similar products |
| 05/23/1990 | CA2003505A1 Process for bleaching pulp |
| 05/23/1990 | CA2003503A1 Use of aureobasidium pullulans in pulp bleaching |
| 05/15/1990 | CA1268906A1 Procedure for delignification of sulphate pulp |
| 05/11/1990 | CA2002904A1 Phosphate composition and uses thereof |
| 05/08/1990 | US4923565 Method for treating a paper pulp with an enzyme solution |
| 05/08/1990 | CA1268760A1 Method for producing cellulose triacetate from mercerized or unmercerized bleached cellulose produced from dissociated lignocellulosic material |
| 04/25/1990 | CA2001270A1 Method for the treatment of spent liquers in pulp production processes in the wood-processing industry |
| 04/25/1990 | CA2001188A1 Multiple charge chlorine bleaching to reduce formation of chlorinated dioxins and furans |
| 04/24/1990 | US4919755 Dithionite solution of sodium borohydride, sodium hydroxide and a bisulfite solution |
| 04/24/1990 | US4919158 Method and apparatus for washing pulp |
| 04/24/1990 | CA1268141A1 High consistency pressure screen and method of separating accepts and rejects |
| 04/10/1990 | US4915830 Pulp wash press |
| 04/10/1990 | US4915821 Apparatus for treatment of old printed papers with short and long fiber separation |
| 04/10/1990 | US4915785 Single stage process for bleaching of pulp with an aqueous hydrogen peroxide bleaching composition containing magnesium sulphate and sodium silicate |
| 03/27/1990 | US4911700 Cross-linked microfibrillated cellulose prepared from pure generating particles |
| 03/22/1990 | WO1990002837A1 Process for controlling pitch deposits in the pulp and papermaking process |
| 03/22/1990 | WO1990002835A1 Method of making chemi-mechanical pulp from hardwood |
| 03/21/1990 | EP0358996A2 Controlling pitch deposits in the pulp and papermaking processes |
| 03/21/1990 | CN1040644A Pulp wash press |
| 03/20/1990 | US4909900 Concurrent heating, bleaching; forcing mixture through narrow slots |
| 03/20/1990 | US4908896 Backflushing pressure diffuser screens |
| 03/13/1990 | US4908101 Fixed rotatable horizontal casing with pulp flow channel with guides for shearing pulp |
| 03/08/1990 | WO1990002224A1 Pulp wash press |
| 03/06/1990 | US4906364 Filter deck assembly sliding seal |
| 02/28/1990 | EP0356415A2 Backflushing pressure diffuser screens |
| 02/28/1990 | EP0356203A2 Treatment of effluents |
| 02/27/1990 | US4904395 Method and apparatus for thickening fiber suspension |
| 02/27/1990 | CA1266152A1 Process for producing high yield bleached cellulose pulp |
| 02/20/1990 | US4902381 Method of bleaching pulp with ozone-chlorine mixtures |
| 02/20/1990 | CA1266014A1 Direct biological bleaching of hardwood kraft pulp with the fungus coriolus versicolor |
| 02/14/1990 | EP0354741A2 Apparatus for thickening pulp and paper stock |
| 02/13/1990 | US4900400 Arrangement for liquid treatment of pulp |
| 02/13/1990 | CA1265691A1 Pulp washer |
| 01/31/1990 | CN2052008U Washing drum made of reinforced plastic |
| 01/30/1990 | US4897156 Process for activating cellulose pulp with NO and/or NO2 and oxygen in the presence of nitric acid and then delignifying bleaching the activated cellulose pulp |
| 01/30/1990 | US4897155 Method for producing low fines content pulp by subjecting cellulosic chips to low frequency compression-relaxation cycles |
| 01/17/1990 | EP0351330A1 Process for manufacturing bleached chemithermomechanical pulps |
| 01/16/1990 | US4894121 Pressure pulp washer |
| 01/10/1990 | CN2050856U Multi-vat closing beater |
| 01/03/1990 | EP0348411A1 An improved peroxide bleaching method. |
| 01/02/1990 | US4890550 Apparatus for treating fibre material containing liquid |
| 01/02/1990 | CA1264125A1 Method and apparatus for the mixing of liquid or gas into pulp stock |
| 12/28/1989 | WO1989012716A1 Process and apparatus for the manufacture of pulp for paper, board, fiberboard and similar products |
| 12/28/1989 | EP0214279A4 Method and apparatus for detecting contamination in paper pulp. |
| 12/27/1989 | EP0348164A2 Sealing arrangement for a rotatable drum in a vat |
| 12/27/1989 | CN1006199B Process for the decolorization |
| 12/26/1989 | US4889625 Filter for concentrating suspensions |
| 12/26/1989 | US4889599 Apparatus for continuously measuring the soda loss in a pulp washing system |
| 12/20/1989 | EP0347088A2 Method and apparatus for pumping high consistency medium |
| 12/13/1989 | EP0345715A1 Enzymatic delignification of lignocellulosic material |
| 12/12/1989 | US4886575 Detackification of adhesive materials contained in secondary fiber with polyvinyl alcohol |
| 12/05/1989 | US4884943 Method and apparatus for pumping high-consistency fiber suspension |
| 11/29/1989 | EP0343393A2 Multiscreen pressure diffuser |
| 11/29/1989 | CN1037559A Method for producing double gummed paper with full-reed pulp |
| 11/28/1989 | CA1263218A1 Stabilized water-containing sodium dithionite formulations which have been rendered alkaline |
| 11/23/1989 | EP0342204A1 An improved method in gas processing |
| 11/21/1989 | US4881286 Effective diffuser/thickener screen backflushing |
| 11/15/1989 | EP0341913A2 Endless wire for pulp thickener |
| 11/14/1989 | CA1262805A1 Hydrogen peroxide pulp bleaching process |
| 11/07/1989 | US4878998 Adjustments made based on pulp brightness |
| 11/07/1989 | CA1262722A1 Process for dispersing one fluid in another |
| 11/02/1989 | WO1989010446A1 Pulp treatment methods |
| 10/31/1989 | CA1262501A1 Bleaching process and composition |
| 10/18/1989 | EP0337653A2 Improved alkaline peroxide treatment of nonwoody lignocellulosic substrates |
| 10/18/1989 | EP0337432A2 Method and apparatus for treating fiber suspensions |
| 10/17/1989 | US4874468 Apparatus for the liquid treatment of a fibrous board between two endless foraminous belts or wires |
| 10/11/1989 | EP0336842A1 Process for producing a paper pulp for fiduciary use |
| 10/05/1989 | DE3809332A1 Multi-stage process for bleaching wood pulps |
| 10/04/1989 | EP0335576A2 Pulp dewatering process |
| 10/04/1989 | CN1036058A Medium-dense milling method for making cotton stalk pulp and pulp with other mixed materials |
| 10/03/1989 | US4871424 Adding water soluble polyvinyl alcohol |
| 10/03/1989 | US4871423 Enhanced dithionite bleaching |
| 09/27/1989 | EP0334583A2 Pulp washer |
| 09/26/1989 | US4869784 Controlling water input to pulp washing system based on measurements on reduced dimension stream |
| 09/26/1989 | US4869783 High-yield chemical pulping |
| 09/26/1989 | US4869782 Retention of kinking |
| 09/26/1989 | CA1259948A1 Polydentate ligand complex of cr, v, or ti for bleaching cellulose pulp |
| 09/21/1989 | WO1989008738A1 Procedure for bleaching cellulose pulp |
| 09/20/1989 | EP0333506A2 Flame retardant vegetable fibre material and the process of the same |
| 09/20/1989 | EP0333398A2 Process for bleaching mechanical wood pulp |
| 09/20/1989 | CN2044613U Net-type vacuum filtering pulp-washing machine with extrusion apparatus |
| 09/19/1989 | CA1259571A1 Rotating disc filter |
| 09/19/1989 | CA1259456A1 Enhanced oxidative extraction |
| 09/19/1989 | CA1259454A1 Hydrogen peroxide whitening process for mechanical pulp |
| 09/05/1989 | US4863564 Reduction, deaeration |
| 08/30/1989 | EP0330387A2 Improved method and apparatus for processing pulp |
| 08/29/1989 | US4861766 Antimicrobial composition |
| 08/29/1989 | US4861433 Dewatering press with perforated metal outer shell and resilient elastic mounting means |