| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 10/31/1993 | CA2067720A1 Process for enhancing paper pulp bleaching using ozone, and pulp thus treated |
| 10/29/1993 | CA2091272A1 Methods for controlling the deposition of organic contaminants in pulp and papermaking processes |
| 10/28/1993 | WO1993021377A1 Method and device for treating pulp |
| 10/28/1993 | WO1993021106A1 Production of bleaching chemicals on site at a pulp mill |
| 10/26/1993 | US5256252 Method for controlling pitch deposits using lipase and cationic polymer |
| 10/26/1993 | US5255540 Pressurized dynamic washer |
| 10/26/1993 | CA1323470C Compositions for scale inhibition for kraft digesters |
| 10/20/1993 | EP0566327A1 Method of bleaching de-inked pulp |
| 10/20/1993 | EP0565625A1 Chlorine-free process for bleaching lignocellulosic pulp |
| 10/19/1993 | US5254744 Preparation and purification of poly(tetramethylene ether) formal glycols and poly(oxybutylene formal) glycols |
| 10/18/1993 | CA2093576A1 Ozone mixing test apparatus |
| 10/16/1993 | CA2066082A1 Two stage pressure diffuser |
| 10/14/1993 | CA2132335A1 Delignifying preparation exhibiting .alpha.-l-arabinofuranosidase activity production and application thereof |
| 10/12/1993 | US5252183 Process of pulping and bleaching fibrous plant material with tert-butyl alcohol and tert-butyl peroxide |
| 10/12/1993 | CA2013132C Pump for and method of separating gas from a fluid to be pumped |
| 10/09/1993 | CA2065574A1 Medium consistency ozone bleaching |
| 10/07/1993 | DE4311221A1 Suspension or sludge liq. sepn. - has dosed feed from holding vessel to sepn. stage with sepn. speed related to dosage delivery |
| 10/07/1993 | CA2093536A1 Process for the treatment of pre-concentrated solid-liquid mixture streams and installation to carry it out |
| 10/06/1993 | EP0564443A1 Treatment of bleach plant filtrates |
| 10/06/1993 | EP0564085A1 Minimising gas separation in a mixer outlet |
| 10/01/1993 | CA2092948A1 Treatment of bleach plant filtrates |
| 09/30/1993 | WO1993019246A1 Screening device |
| 09/30/1993 | WO1993019245A1 Process for peroxide bleaching of mechanical pulp |
| 09/29/1993 | EP0562835A1 Stabilisation of bleach liquors |
| 09/29/1993 | EP0561786A1 Bleaching chemical pulp using chlorine/chlorine dioxide then ozone |
| 09/29/1993 | CN1076743A Method for making pulp of newsprint and book paper by shattering cotton-rod, removing black bark and pith |
| 09/28/1993 | US5248389 Process for peroxide bleaching of mechanical pulp using sodium carbonate and non-silicate chelating agents |
| 09/28/1993 | CA1322436C Pulp dewatering process |
| 09/21/1993 | US5246548 Pitch control |
| 09/21/1993 | US5246543 Process for bleaching and delignification of lignocellulosic materials |
| 09/19/1993 | CA2091139A1 Pulp bleaching system |
| 09/16/1993 | WO1993018226A1 Combined ozone destruction and fiber scrubbing in paper pulp mills |
| 09/16/1993 | WO1993017782A1 Varying annular fluidization zone for increased mixing efficiency in a medium consistency mixer |
| 09/16/1993 | CA2131461A1 Varying annular fluidization zone for increased mixing efficiency in a medium consistency mixer |
| 09/16/1993 | CA2107764A1 Combined ozone destruction and fiber scrubbing in paper pulp mills |
| 09/15/1993 | EP0560421A1 Process for the discolouration and bleaching of waste paper |
| 09/14/1993 | US5244541 Liquid containers |
| 09/10/1993 | CA2091224A1 Process for removing colour and bleaching used coloured papers |
| 09/02/1993 | WO1993017178A1 Nitric oxide treatment for ozone bleaching |
| 09/01/1993 | EP0557651A1 Integrated pulping process of waste paper yielding tissue-grade paper fibers |
| 08/31/1993 | CA1321760C Method for thickening of slurry and for its treatment with liquid as well as a drum filter |
| 08/26/1993 | DE4204915A1 Reprocessing waste paper - in presence of peroxide(s) with mixts. of polyfunctional carboxylic acids and polymeric cpds. as flotation stabilisers |
| 08/25/1993 | EP0557112A1 Chlorine free bleaching and pulping process |
| 08/24/1993 | US5238501 Feeding slurry at inclined angle onto endless filter belt, distributing over width under localized pressure, washing under differential pressure, withdrawing washed slurry |
| 08/22/1993 | CA2089516A1 Chlorine free pulping and bleaching sequence |
| 08/22/1993 | CA2061645A1 Chlorine-free chlorine dioxide |
| 08/19/1993 | WO1993016228A1 Fluff pulp and method for the preparation of fluff pulp |
| 08/19/1993 | WO1993016227A1 Modified digestion of paper pulp followed by ozone bleaching |
| 08/19/1993 | WO1993016226A1 Oxygen delignification of waste cellulosic paper products |
| 08/19/1993 | CA2130180A1 Modified digestion of paper pulp followed by ozone bleaching |
| 08/19/1993 | CA2128225A1 Oxygen delignification of waste cellulosic paper products |
| 08/18/1993 | CN1021839C Improvement of vacuum system device of belt-type vacuum pulp-washing machine |
| 08/11/1993 | EP0554965A1 Process for bleaching of lignocellulose-containing material |
| 08/11/1993 | EP0554391A1 Pulping process. |
| 08/10/1993 | US5234550 Wall means having slots between adjacent bars for withdrawing liquid from particle material |
| 08/10/1993 | US5234544 Using mixture of oxygen, alkali and surfactant; papermaking |
| 08/10/1993 | US5234466 Forms less corrosive solution than sulfamic acid |
| 08/10/1993 | CA1321094C Method and apparatus for treating fiber suspensions |
| 08/05/1993 | WO1993015264A1 Gas phase delignification of lignocellulosic material |
| 08/05/1993 | WO1993015263A1 Process for gas phase delignifying lignocellulosic material |
| 08/05/1993 | WO1993015261A1 Pulping of fibrous plant materials and recovery of resultant by-products |
| 08/05/1993 | WO1993014860A1 Separation device and process |
| 08/05/1993 | CA2128408A1 Gas phase delignification of lignocellulosic material |
| 08/05/1993 | CA2116544A1 Pulping of fibrous plant materials and recovery of resultant by-products |
| 08/04/1993 | EP0553649A1 Process for delignifying a cellulose pulp |
| 08/04/1993 | EP0553196A1 Hydrolysis of resin in pulp. |
| 08/04/1993 | EP0553141A1 Method for preserving the mechanical strength properties of chemical paper pulp. |
| 08/03/1993 | CA1320863C Interstage treatment of mechanical pulp |
| 08/01/1993 | CA2088281A1 Process for delignifying raw cellulose |
| 07/22/1993 | WO1993014264A1 Method and apparatus for crosslinking individualized cellulose fibers |
| 07/22/1993 | WO1993014262A1 Bleaching of chemical pulp |
| 07/22/1993 | WO1993014261A1 Method for crosslinking individualized cellulose fibres |
| 07/22/1993 | WO1993014260A1 Pulp bleaching apparatus and method |
| 07/22/1993 | CA2128015A1 Method and apparatus for crosslinking individualized cellulose fibers |
| 07/22/1993 | CA2124088A1 Bleaching of chemical pulp |
| 07/21/1993 | EP0551970A1 Pitch control |
| 07/14/1993 | EP0550547A1 Improved washing process. |
| 07/14/1993 | CA2059256A1 Pitch control |
| 07/13/1993 | US5227075 Process and apparatus for continuous filtering and liquid displacement of a liquid suspension of a fibrous or finely-divided material |
| 07/13/1993 | US5227022 For heavy metals, bleaching |
| 07/13/1993 | US5227021 Method for producing pulp using medium consistency mixer for defiberizing pulp |
| 07/08/1993 | WO1993013262A1 Gravity type pulp washer or thickener |
| 07/08/1993 | CA2126239A1 Gravity type pulp washer or thickener |
| 07/06/1993 | CA1319847C Means and method for removal of strings from wastepaper pulp |
| 06/29/1993 | US5223097 Method for controlling pitch on a paper-making machine |
| 06/29/1993 | US5223091 Chelating and thickening, adding group 2A compounds |
| 06/29/1993 | US5223090 Method for fiber loading a chemical compound |
| 06/29/1993 | CA1319621C Method and equipment for filtration of suspension |
| 06/29/1993 | CA1319472C Lignin removal method |
| 06/24/1993 | WO1993012287A1 Process for the manufacture of bleached paper pulp |
| 06/23/1993 | EP0547100A1 Process for treatment of lignocellulosic pulp and apparatus for performance of the process. |
| 06/22/1993 | US5221434 Method for treating fiber suspensions |
| 06/18/1993 | CA2085512A1 Drum washer sealing |
| 06/16/1993 | EP0546045A1 Enzymes with xylanolytic activity. |
| 06/16/1993 | EP0545958A1 A process for hydrolyzing hemicellulose by enzymes produced by trichoderma reesei. |
| 06/10/1993 | WO1993011296A1 Method and enzymatic preparation for treatment of cellulose pulps |
| 06/10/1993 | CA2125166A1 Method and enzymatic preparation for treatment of cellulose pulps |
| 06/09/1993 | EP0545888A1 Variable stage pressure diffuser |
| 06/09/1993 | EP0483164A4 A ground fault circuit interrupter |
| 06/08/1993 | US5217575 Process for oxygen bleaching using two vertical reactors |