| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 04/20/1997 | CA2160972A1 Peroxide bleaching process and substrate bleached thereby |
| 04/17/1997 | WO1997013922A1 Method of fixing cellulose fibres |
| 04/17/1997 | WO1997013572A1 A concentrator press |
| 04/17/1997 | CA2234097A1 A concentrator press |
| 04/16/1997 | EP0767849A1 Production of soft paper products from old newspaper |
| 04/16/1997 | EP0767632A1 Method for delivering a gas-supersaturated fluid to a gas-depleted site and use thereof |
| 04/16/1997 | EP0656966B1 Method of treating process water |
| 04/16/1997 | EP0652802B1 Device for admixing a processing agent to a pulp suspension |
| 04/16/1997 | EP0644966B1 Bleaching recycled pulp with a reductive-oxidative sequence |
| 04/16/1997 | EP0621915B1 Bleaching of chemical pulp |
| 04/16/1997 | EP0554391B1 Pulping process |
| 04/16/1997 | CN1147841A Method for preparing delignified and bleached chemical paper pulps |
| 04/16/1997 | CN1147799A Method and plant for producing hydrogen peroxide |
| 04/15/1997 | US5621118 Partial preneutralization of caro's acid; producing dioxirane from ketones |
| 04/15/1997 | US5620565 Adding surfactant and enzymes to pulp slurry prior to dewatering, crumbing and mixing fibers with oil; waste paper recycling |
| 04/15/1997 | US5620563 Greater delignification, improved brightness without increasing fiber degradation |
| 04/15/1997 | US5620562 Continuous digestion of kraft pulp while maintaining low concentrations of dissolved organic materials yields increased strength and bleachability |
| 04/15/1997 | CA2032315C Process for bleaching of chemical cellulose pulp |
| 04/15/1997 | CA2028788C Process for the chlorine-free bleaching of cellulosic materials |
| 04/10/1997 | WO1997013026A1 Apparatus for dewatering/pressing in combination with washing of paper pulp |
| 04/10/1997 | WO1997013025A1 Method for improving the efficiency of chemical pulping processes by pretreating wood or pulpwood with white rot fungi |
| 04/10/1997 | DE19537134A1 Prodn. of cellulose pulp |
| 04/10/1997 | CA2233046A1 Method for improving the efficiency of chemical pulping processes by pre-treatment with white rot fungi |
| 04/10/1997 | CA2230115A1 Apparatus for dewatering/pressing in combination with washing of paper pulp |
| 04/09/1997 | EP0767270A1 Pitch controlling agent and method for inhibiting pitch troubles |
| 04/09/1997 | EP0766761A1 Delignification of chemical pulp with peroxide in the presence of a transition metal |
| 04/09/1997 | EP0607448B1 Process for producing thiourea dioxide and bleaching of papermaking pulp with thiourea dioxide produced thereby |
| 04/09/1997 | CN1147271A Use of thermostable enzyme as feed additive |
| 04/08/1997 | US5618861 Applying pitch retarding amount of cationic guar and polyethylene oxide to papermaking process |
| 04/08/1997 | US5618386 Using enzyme prepared by culturing streptomyces viridosporus bacterium |
| 04/08/1997 | US5618385 Contacting diluting liquor containing hydrogen peroxide decomposing catalase enzyme with an enzyme stabilizer selected form ozone, chlorine dioxide, chlorine and others, diluting the liquor, contacting with pulp and bleaching |
| 04/03/1997 | WO1997011989A1 Sulfonated polymers and method of sulfonating polymers |
| 04/02/1997 | EP0765418A1 Method for producing cellulose pulp and use of a compound in the method |
| 04/02/1997 | EP0765416A1 Individualized cellulosic fibers crosslinked with polyacrylic acid polymers |
| 04/02/1997 | EP0765394A1 Purified myceliophthora laccases and nucleic acids encoding same |
| 04/02/1997 | EP0765381A1 Bleach activation |
| 04/01/1997 | US5616280 Bleaching composition |
| 04/01/1997 | US5616215 Hydrolysis of esters from pitch (contained in wood pulp) by lipase in presence of aluminum salt |
| 04/01/1997 | US5616151 Acidification |
| 04/01/1997 | CA2045333C Wall means |
| 03/27/1997 | WO1997011164A1 Purified mannanase from bacillus amyloliquefaciens and method of preparation |
| 03/27/1997 | CA2230510A1 Purified mannanase from bacillus amyloliquefaciens and method of preparation |
| 03/26/1997 | EP0585217B1 Preparation exhibiting enzymatic delignification activity, a method of producing the same, and applications thereof |
| 03/26/1997 | CN1146224A Suspension-treating device |
| 03/25/1997 | CA2081398C Wash press modification for oxygen delignification process |
| 03/20/1997 | WO1997010380A1 Method and apparatus for cleaning a fiber pulp washer from stickies |
| 03/20/1997 | WO1997010379A1 Supply of washing liquid in a fractionating multi-stage washer |
| 03/20/1997 | WO1997010342A1 Alkaliphilic and thermophilic microorganisms and enzymes obtained therefrom |
| 03/20/1997 | CA2231843A1 Alkaliphilic and thermophilic microorganisms and enzymes obtained therefrom |
| 03/19/1997 | EP0763622A2 Continuous solvent pulping and washing processes and apparatus |
| 03/19/1997 | EP0763156A1 Process for removal of metal compounds in lignocellulosic pulp |
| 03/18/1997 | US5611891 System and method for controlling papermaking stock consistency |
| 03/18/1997 | US5611889 Discoloration inhibition; brightening; papermaking |
| 03/18/1997 | CA2029014C Absorbent structure containing individualized, polycarboxylic acid crosslinked fibers |
| 03/12/1997 | EP0761464A1 Thermal transfer of dye mixtures comprising azamethine dyes |
| 03/12/1997 | EP0652990B1 Method of processing recycled paper |
| 03/12/1997 | EP0623046B1 Separation device and process |
| 03/11/1997 | US5610048 Xylanase, DNA sequences, coding for the xylanases and methods of use thereof |
| 03/11/1997 | US5610046 Cloning and expression of xylanase B |
| 03/11/1997 | US5609762 Cellulose membranes comprising cotton fibers and method of manufacturing them |
| 03/11/1997 | US5609724 Fungi for pitch reduction and their preparation |
| 03/11/1997 | US5609723 Oxygen bleaching process for cellulocis pulps with a polyhydric alcohol cellulose protector |
| 03/11/1997 | US5608973 Arrangement for lowering the noise level of a cooling layer in a pulp dryer and a pulp dryer |
| 03/11/1997 | CA2082557C Integrated pulping process of waste paper yielding tissue-grade paper fibers |
| 03/06/1997 | WO1997008381A1 Method for preventing accumulation of metals in a closed pulp bleaching process |
| 03/06/1997 | WO1997008380A1 Treatment of pulp with chelating agent in at least two mixing steps without intermediate washing |
| 03/06/1997 | WO1997007886A1 Manganiferous polyoxometalates, synthesis and use thereof |
| 03/06/1997 | CA2230078A1 Manganese-containing polyoxometallates synthesis and use |
| 03/06/1997 | CA2229893A1 Method for preventing accumulation of metals in a closed pulp bleaching process |
| 03/06/1997 | CA2229212A1 Treatment of pulp with chelating agent in at least two mixing steps without intermediate washing |
| 03/05/1997 | CN1144538A Alkaling bacillus amylase |
| 03/05/1997 | CN1144289A Everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide |
| 03/04/1997 | US5607547 Adding carbonate with sodium dithionite |
| 03/04/1997 | US5607546 CTMP-process |
| 03/04/1997 | US5607545 Ozone bleaching process utilizing a fluidizing mixer and super-atmospheric pressure |
| 03/04/1997 | US5607544 Process and agent for the oxidative bleaching of wood pulp and for deinking waste paper |
| 03/04/1997 | US5607233 Continuous dynamic mixing system |
| 03/04/1997 | CA2067296C Process for bleaching of lignocellulose-containing pulp |
| 03/04/1997 | CA2029025C Process for preparing polycarboxylic acid crosslinked fibers and fibers thereof |
| 02/27/1997 | WO1996041987A3 High pressure gas exchanger |
| 02/27/1997 | DE19530787A1 Mangan enthaltende Polyoxometallate, Synthese und Verwendung Manganese-containing polyoxometalates, synthesis and use |
| 02/26/1997 | EP0759105A1 Method for preparing delignified and bleached chemical paper pulps |
| 02/25/1997 | USRE35460 Adding calcium oxide or hydroxide to cellulosic fibers, contacting with carbon dioxide to provide calcium carbonate loaded within hollow interior and walls |
| 02/25/1997 | US5605604 Bleaching with ozone, mechanically processing to press resin out and thicken sulifte pulp |
| 02/25/1997 | CA2069017C Process and apparatus for conditioning ozone gas recycle stream in ozone pulp bleaching |
| 02/20/1997 | WO1997006305A1 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant |
| 02/20/1997 | WO1997006304A1 Process for bleaching cellulose pulp |
| 02/20/1997 | WO1997006303A1 Method of stabilizing peroxide-containing alkaline bleach liquors for bleaching cellulose and other fibrous materials |
| 02/20/1997 | WO1997006244A1 Method for enhancing the activity of an enzyme, compounds showing enzyme activity enhancement, and detergents containing such compounds |
| 02/20/1997 | WO1997005940A1 Single roll displacement wash press |
| 02/20/1997 | CA2229046A1 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant |
| 02/20/1997 | CA2228845A1 Single roll displacement wash press |
| 02/20/1997 | CA2228636A1 Method of stabilizing peroxide-containing alkaline bleach liquors for bleaching cellulose and other fibrous materials |
| 02/20/1997 | CA2220408A1 Method of bleaching cellulose pulp |
| 02/19/1997 | EP0758379A1 Use of a thermostable enzyme as a feed additive |
| 02/19/1997 | EP0758378A1 Thermostable xylanases |
| 02/19/1997 | CN1143398A Impact of temperature and alkali charge on pulp brightness |
| 02/19/1997 | CN1143387A Thermostable xylanases |
| 02/19/1997 | CN1143131A Method for removing resin from mixing tropical hard wood pulp |
| 02/19/1997 | CN1143050A Method for treating liquid |