D21C 3/24

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9803317 Method of digesting lignocellulosic materialFeb 08, 13Oct 31, 17BASF SE
9777429 Continuous process for production of cellulose pulp from grass-like plant feedstockMar 31, 14Oct 03, 17Not available
9580864 Kraft cooking method using polysulfide cooking liquorOct 03, 16Feb 28, 17VALMET AB
9371612 Method and apparatus to produce pulp using pre-hydrolysis and Kraft cookingFeb 01, 12Jun 21, 16ANDRITZ INC.
9328458 Digester shell extensionMay 20, 15May 03, 16VALMET AB
9194080 Two vessel reactor system and method for hydrolysis and digestion of wood chips with chemical enhanced wash methodMay 15, 14Nov 24, 15ANDRITZ INC.
9145642 Cooking process of lignocellulose materialMay 18, 10Sep 29, 15NIPPON PAPER INDUSTRIES CO., LTD., PERMELEC ELECTRODE LTD., SURGICAL INNOVATIONS V.O.F.,
8986501 Methods for removing hemicelluloseMar 14, 13Mar 24, 15CELANESE INTERNATIONAL CORPORATION
8888959 Feeding system comprising pumps in parallel for a continuous digesterDec 03, 13Nov 18, 14VALMET AB
8852395 Method and arrangement for adding treatment liquors to cellulose material in a down flow vesselMar 25, 11Oct 07, 14VALMET AB
8795468 Method and system for impregnating chipsJul 09, 10Aug 05, 14VALMET AB
8691049 Method for an energy efficient production of cellulose pulp in a continuous digesterNov 05, 07Apr 08, 14VALMET AB
8273212 Method for kraft pulp production where hemicelluloses are returnedDec 16, 08Sep 25, 12METSO PAPER SWEDEN AB
7279070 Method for the continuous cooking of wood raw material for cellulose pulpMay 15, 03Oct 09, 07METSO PAPER SWEDEN AB
7241363 Methods to decrease scaling in digester systemsJun 26, 04Jul 10, 07INTERNATIONAL PAPER COMPANY
6702921 Methods to enhance pulp bleaching and delignification using an organic sulfide chelating agentMay 01, 01Mar 09, 04ECOLAB USA INC.
6699357 Process for continuous cooking of pulpSep 28, 01Mar 02, 04METSO FIBER KARLSTAD AB
6605180 Process for continuous cooking of pulpSep 28, 01Aug 12, 03METSO PAPER SWEDEN AB
6576084 Method of pretreating pulp with yield or strength-enhancing additiveSep 12, 00Jun 10, 03ANDRITZ INC.
6569289 Cellulose slurry treating systems for adding AQ to a cellulose slurry in the substantial absence of alkaliNov 15, 01May 27, 03ANDRITZ INC.

Showing 1 to 20 of 30 results