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| Patents for D21C 3 - Pulping cellulose-containing materials (5,020) |
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| 07/19/1977 | US4036681 Delignification of lignocellulosic material with an alkaline pulping liquor containing a Diels Alder adduct of benzoquinone or naphthoquinone | | 07/19/1977 | US4036680 Delignification of lignocellulosic material with a soda pulping liquor containing a Diels Alder adduct of benzoquinone or naphthoquinone in admixture with a nitro aromatic compound | | 06/07/1977 | US4028171 Method for continuous treatment of fiber material in a vertical array | | 04/12/1977 | US4017642 Process of making food for ruminant animals from wood and/or woody products | | 03/15/1977 | US4012280 Delignification of lignocellulosic material with an alkaline liquor in the presence of a cyclic keto compound | | 03/01/1977 | US4010066 Method for improving heat economy in the batchwise digestion of lignocellulosic material by adjusting the level of free digestion liquor | | 03/01/1977 | US4009835 Continuous, from wood chips | | 01/11/1977 | US4002526 Oxygen-alkali delignification of low consistency wood pulp | | 09/21/1976 | US3981765 Treatment of wood chips with an alkali metal borohydride solution followed by mechanical defibration | | 08/17/1976 | US3975232 Three stage process for pulping lignocellulosic materials including a cyanide ion containing first stage | | 06/22/1976 | US3965085 Method for refining of soaps using solvent extraction | | 06/15/1976 | US3963560 N-alkyllactam | | 06/08/1976 | US3962033 Method for producing cellulose pulp | | 05/04/1976 | US3954553 Non-sulfur pulping process for corrugating medium using sodium carbonate and sodium hydroxide | | 04/20/1976 | US3951734 Ammonia-ketone pulping process | | 04/20/1976 | US3951732 Delignification and bleaching of wood pulp with oxygen in the presence of triethanolamine | | 03/16/1976 | US3944463 Pulping of lignocellulosic material with oxygen in two stages at increasing pH | | 03/02/1976 | US3941649 Process for obtaining a predetermined Kappa number in sulfate pulping | | 02/10/1976 | US3937647 Controlling ph | | 01/13/1976 | US3932207 Process for obtaining cellulose from ligno-cellulosic raw materials |
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