| Patents for D21C 5 - Other processes for obtaining cellulose, e.g. cooking cotton linters (5,432) |
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| 03/12/1991 | CA2016262A1 Process for sizing calcium carbonate-containing papers with resin size dispersions |
| 03/07/1991 | WO1991002840A1 Improvement of oxygen bleaching of pulp |
| 03/07/1991 | WO1991002791A1 Enzymatic bleaching of pulp |
| 03/07/1991 | DE3928841A1 Deinken von altpapieren Deinking wastepaper |
| 03/07/1991 | DE3928599A1 Verfahren zur altpapieraufbereitung in gegenwart polyalkylenoxidketten- und stickstoffhaltiger verbindungen Polyalkylenoxidketten- method for waste paper in preparation of nitrogen-containing compounds present and |
| 03/06/1991 | EP0415193A2 Finely divided suspension of cellulosic material and process for producing the same |
| 03/05/1991 | US4997523 Alkoxylated diamine, phosphate or phosphonate |
| 03/05/1991 | US4997488 Combined physical and chemical treatment to improve lignocellulose digestibility |
| 03/01/1991 | WO1991003598A1 Use of at least partly water-soluble polymers for removing printing ink from printed waste paper and/or recycling water in the papermaking industry |
| 03/01/1991 | WO1991003597A1 Flotation process for removing fillers from waste paper in the presence of polymers and copolymers |
| 03/01/1991 | CA2066634A1 Flotation process for removing fillers from waste paper in the presence of polymers and copolymers |
| 03/01/1991 | CA2065256A1 Use of at least partly water-soluble polymers for removing printing ink from printed waste paper and or recycling water in the papermaking industry |
| 02/26/1991 | WO1991002839A1 Process for treatment of lignocellulosic pulp |
| 02/26/1991 | CA2065244A1 Process for treatment of lignocellulosic pulp |
| 02/14/1991 | DE4024561A1 Processing waste paper |
| 02/13/1991 | CN1049201A Method of separating short-staple in cottonseed shell |
| 02/11/1991 | CA2022778A1 Method for processing waste paper |
| 01/23/1991 | EP0408803A1 Procedure for the bleaching of sulphate pulp |
| 01/16/1991 | EP0407501A1 Method and composition for deinking recycled paper pulp |
| 01/15/1991 | WO1991001405A1 Process for processing waste paper |
| 01/15/1991 | CA2064201A1 Process for processing waste paper |
| 01/09/1991 | EP0406617A2 Enzymatic delignification of lignocellulosic material |
| 01/08/1991 | US4983258 Conversion of pulp and paper mill waste solids to papermaking pulp |
| 01/02/1991 | EP0406105A1 Method for treating waste water containing water-soluble ink |
| 12/30/1990 | CA2020069A1 Treatment process and apparatus of water-ink containing affluents |
| 12/27/1990 | EP0404647A1 Apparatus of liquid degassing |
| 12/27/1990 | EP0245237B1 Method of obtaining cellulase deficient strains of white-rot fungi |
| 12/22/1990 | CA2019411A1 Enzymatic delignification of lignocellulosic material |
| 12/18/1990 | US4977943 Mixing waste paper dissolving slurry and treating gas before floatator treating step, separation of ink and sticky residues, deinking |
| 12/11/1990 | US4976822 Apparatus for cleaning fibers |
| 12/05/1990 | CN1010699B Bamboo as pulp making fiber |
| 11/29/1990 | WO1990014462A1 Method and apparatus for cleaning fibers |
| 11/29/1990 | WO1990011402A3 Process for processing waste paper |
| 11/22/1990 | DE3934772A1 Verfahren zum entfernen von druckfarbe aus altpapier A method for removing waste paper by printing ink from |
| 11/20/1990 | US4971656 Flotation process for deinking printed waste paper |
| 11/07/1990 | EP0395792A2 Procedure for the bleaching of pulp |
| 11/06/1990 | US4968385 Method of preparing a plup using a fluidizing centrifugal pump during impregnation |
| 11/06/1990 | CA1275757C Method of processing waste paper |
| 10/31/1990 | EP0394775A1 A deinking agent |
| 10/31/1990 | EP0394690A1 Polyfunctional polymers as deinking agents |
| 10/24/1990 | EP0393325A1 Device for removing wire from bales, especially bales of waste paper |
| 10/23/1990 | US4964949 Deinking composition for reclamation of waste paper |
| 10/10/1990 | EP0391042A1 Method of controlling a flotation plant |
| 10/07/1990 | CA2014216A1 Process for controlling a flotation device |
| 10/03/1990 | EP0389872A2 Process for recycling waste paper |
| 09/25/1990 | US4959123 Process for deinking printed waste paper |
| 09/24/1990 | WO1990011402A2 Process for processing waste paper |
| 09/24/1990 | CA2049967A1 Process for regenerating wastepaper |
| 09/20/1990 | WO1990010749A1 Method of de-inking waste paper materials |
| 09/20/1990 | WO1990010748A1 Preparation of cellulose and fermentation or nutrient products from the biomass of whole annual plants, preferably cereals |
| 09/12/1990 | EP0387187A2 Process for reducing the pitch content in pulpwood |
| 09/12/1990 | EP0386888A2 Oxygen delignification and enzyme treatment |
| 09/11/1990 | US4956051 Antisticking agents, paper, hot melt adhesives, pressure sensitive adhesives |
| 09/05/1990 | EP0275256B1 Method of processing waste paper |
| 08/29/1990 | EP0383999A2 Procedure for the bleaching of pulp |
| 08/29/1990 | CN1009382B Composition and method of deinking of recycled cellulosic material |
| 08/28/1990 | US4952426 Coating paper with plastic |
| 08/28/1990 | US4952308 Pressurized flotation module and method for pressurized foam separation |
| 08/16/1990 | EP0382259A2 A complex of a fibrous material and fungi and a process for its preparation |
| 08/15/1990 | CN1009212B Method of and means for hydrodynamic mixing |
| 08/01/1990 | EP0379858A2 Process for bleaching fibre stock for making paper |
| 07/31/1990 | CA1272004A1 Process and apparatus for removing ink from wastepaper |
| 07/27/1990 | CA2008678A1 Process for bleaching paper stock |
| 07/26/1990 | WO1990008220A1 Process for the flotation of fillers made of waste paper in the presence of organic phosphoric esters |
| 07/26/1990 | WO1990008219A1 Process for the flotation of fillers made of waste paper in the presence of tensides containing sulphonate groups |
| 07/19/1990 | DE4000558A1 Paper-making with application of pulp suspension to a sieve wire - with addn. of enzyme to recirculation water passing through wire to cleave deleterious dissolved substances such as hemicellulose |
| 07/19/1990 | DE3900940A1 Verfahren zur flotation von fuellstoffen aus altpapieren in gegenwart sulfonatgruppenhaltiger tenside Process for the flotation of fillers from wastepaper in contemporary sulfonate surfactants |
| 07/16/1990 | CA2007774A1 Method for delivering pulp onto the wire of a paper machine |
| 07/14/1990 | CA2007736A1 Process for separating fillers from wastepaper |
| 07/14/1990 | CA2007735A1 Process for separating filler from pulped wastepaper |
| 07/12/1990 | WO1990005806A3 De-inking of old papers |
| 07/12/1990 | WO1990005805A3 De-inking of old papers |
| 06/27/1990 | EP0374700A2 Process for preparing mechanical pulp and for paper containing said pulp |
| 06/27/1990 | CA2006570A1 Paper recycling aid |
| 06/26/1990 | CA1270607A1 Detackification of adhesive materials contained in secondary fiber |
| 06/20/1990 | EP0374057A2 Process for bleaching deinked pulp |
| 06/20/1990 | EP0373375A2 De-inking of waste papers |
| 06/19/1990 | US4935366 Method of obtaining cellulase deficient strains of white-rot fungi |
| 06/19/1990 | US4935096 Process for the deinking of cellulosic materials |
| 06/13/1990 | EP0373108A2 Process for bleaching pulp |
| 06/13/1990 | EP0373107A2 Use of enzymes of Aureobasidium pullulans in pulp bleaching |
| 06/13/1990 | EP0372267A2 De-inking of waste papers |
| 06/06/1990 | CN2057868U Wasted paper floatation ink-elimiating machine |
| 05/31/1990 | WO1990005806A2 De-inking of old papers |
| 05/31/1990 | WO1990005805A2 De-inking of old papers |
| 05/23/1990 | EP0369667A2 Deinking agent |
| 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 |
| 05/23/1990 | CA2003407A1 Deinking of wastepaper |
| 05/23/1990 | CA2003406A1 Deinking of wastepaper |
| 05/08/1990 | US4923981 Foods, drugs; reduced fat and calories |
| 05/08/1990 | US4923565 Method for treating a paper pulp with an enzyme solution |
| 05/03/1990 | WO1990004674A1 Method and composition for deinking recycled paper pulp |
| 04/24/1990 | US4919754 Composition wherein recycled cellulosic pulp is deinked |
| 04/24/1990 | CA1268132A1 Enzymes which catalyze the degradation and modification of lignin |
| 04/17/1990 | US4917762 Cutting paper or cellulose pulp, mixing with water and surfactants |
| 04/17/1990 | CA1267859A1 Method of obtaining cellulase deficient strains of white-rot fungi |
| 04/10/1990 | US4915821 Apparatus for treatment of old printed papers with short and long fiber separation |