| Patents for D21C 9 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters (10,265) |
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| 01/31/1978 | US4071193 Method of and apparatus for flow spreading |
| 01/24/1978 | US4070234 Process related to pulp bleaching effluent purification using ion exchange resins |
| 01/24/1978 | US4070233 Delignifying |
| 01/03/1978 | US4066494 Nitrogenous condensation products used as retention aids in papermaking |
| 12/27/1977 | US4065348 Method and apparatus for detecting and controlling the caustic in paper pulp bleaching |
| 12/13/1977 | US4062722 Device for treating deformable particles with the counterflowing liquids |
| 11/15/1977 | USRE29473 Alkali or alkaline earth metal pyrosulfate and hypochlorite |
| 11/01/1977 | US4056473 Rotary filter for concentrating fiber suspensions |
| 11/01/1977 | US4056430 Alkyleneaminophosphonic acid |
| 11/01/1977 | US4055903 Method and apparatus for drying disintegrated fiber mass |
| 10/11/1977 | US4053352 Method for producing oxidized white liquor |
| 09/27/1977 | US4050981 Process for the delignification of lignocellulosic material by maintaining a concentration of carbon monoxide in the presence of oxygen and alkali |
| 09/20/1977 | US4049490 Electrodialysis of bleaching effluent |
| 09/06/1977 | US4046621 Process for treating a slurry of cellulosic material |
| 08/23/1977 | US4043049 Process and apparatus for flash drying fluffed cellulose pulp |
| 08/16/1977 | US4042452 Process for washing cellulose pulp from alkali digestion wherein acid is added to the washing solution |
| 08/16/1977 | US4041560 Method and device for dewatering of suspensions in movement |
| 08/02/1977 | US4039374 Bleaching of cellulosic pulp fibers with chlorine dioxide in the presence of a vanadium compound |
| 08/02/1977 | US4039372 Bleach plant filtrate recovery |
| 07/19/1977 | US4036679 Mechanical treatment |
| 06/21/1977 | US4031013 Method and apparatus for fiber suspension dewatering |
| 06/21/1977 | US4030969 Method of dispersing a bleaching agent into a stream of fibrous cellulosic pulp material in a throttling nozzle |
| 06/14/1977 | US4029543 Mechanically freeing wood fibers in the presence of spent peroxide bleaching liquor |
| 05/24/1977 | US4025472 Graft polymer with addition polymer, salt formation |
| 05/10/1977 | US4022654 Countercurrently bleaching high consistency cellulose pulp with oxygen |
| 04/05/1977 | US4016029 Process for delignifying and bleaching cellulose pulp |
| 03/29/1977 | US4014736 Fluid flow, pressure differential |
| 03/22/1977 | US4013506 Method and apparatus for automatically and simultaneously controlling solution viscosity and brightness of a pulp during multi-stage bleaching |
| 03/01/1977 | US4010067 Process of preventing formation of resinous deposits in the manufacture of paper and the like |
| 02/15/1977 | US4008120 Process of delignification and bleaching a lignocellulose product |
| 01/25/1977 | US4004967 Bleaching cellulose pulp with oxygen in the presence of formaldehyde |
| 01/18/1977 | US4003304 Screw press |
| 01/11/1977 | US4002526 Oxygen-alkali delignification of low consistency wood pulp |
| 11/16/1976 | US3992250 Vegetable fibers, digestion, thickening |
| 11/16/1976 | US3992249 Anionic polymers, complexing |
| 11/16/1976 | US3992248 Continuous feeding system for treatment towers |
| 10/19/1976 | US3986974 Aroyl-n-hydroxyformimidoyl halides as bleach activators |
| 10/19/1976 | US3986973 Cyanoformates and cyanoformamides as bleach activators |
| 10/19/1976 | US3986972 Hydrogen peroxide |
| 10/19/1976 | US3986951 Aluminum compounds, precipitation, chlorine, sodium chloride, hydroxide, and hypochlorite |
| 10/12/1976 | US3985674 Bleach |
| 10/12/1976 | US3985005 Apparatus for processing liquid-containing substance mixtures, particularly cellulose pulp |
| 09/14/1976 | US3980518 Device for liquid-treating a running fiber web, including an arc-shaped duct |
| 09/14/1976 | US3980517 Continuous on-machine control of bleaching chemicals |
| 08/24/1976 | US3976538 Method for bleaching of cellulosic pulp |
| 07/13/1976 | US3969201 Electrolytic production of alkaline peroxide solutions |
| 07/06/1976 | US3968006 Pulp bleaching process control using photocells to measure pulp brightness |
| 06/29/1976 | USRE28887 Sequential bleaching of kraft pulp with chlorine dioxide followed by chlorine |
| 06/29/1976 | USRE28884 Woodpulp bleaching process |
| 06/29/1976 | US3966542 Multi-stage bleaching of pulp using successively lower power levels |
| 06/22/1976 | US3964962 Gaseous reaction apparatus and processes including a peripheral gas receiving chamber and a gas recirculation conduit |
| 06/15/1976 | US3963561 Recirculation of unconsumed oxygen pulp bleaching gas |
| 06/08/1976 | US3962030 Bleaching wood pulp with sodium hydrosulfite in the presence of hexamethylenetetramine |
| 06/08/1976 | US3962029 Method of controlling the amount of chemicals in liquids used within the cellulose industry and related industries |
| 06/01/1976 | US3960649 Wood pulp bleaching composition containing sodium hydrosulfite and hexamethylenetetramine |
| 05/11/1976 | US3956165 Bleaching aid |
| 04/20/1976 | USRE28777 Refining of vegetable matter and delignification of the refined matter with chlorine dioxide |
| 04/20/1976 | US3951733 Delignification and bleaching of wood pulp with oxygen |
| 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 |
| 03/09/1976 | US3943034 Dewatering and homogenizing apparatus |
| 03/09/1976 | US3943033 Screw thickener |
| 02/17/1976 | US3938206 Method for continuous displacement washing of liquid-containing pulp materials |
| 01/20/1976 | US3933676 Sodium zincate |
| 01/06/1976 | US3930933 Debonded cellulose fiber pulp sheet and method for producing same |