| Patents for D21C 7 - Digesters (1,988) |
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| 10/14/1998 | EP0870083A1 Pumping of medium consistency, high temperature pulps from stand pipes |
| 10/08/1998 | WO1998044188A1 Method and apparatus for filling a pulp tank |
| 09/09/1998 | EP0862669A1 Continuous digester |
| 09/09/1998 | EP0782642A4 Method and apparatus for the continuous production of cellulosic pulp |
| 09/01/1998 | US5800674 Method and apparatus for improving a batch cooking process |
| 08/18/1998 | US5795438 Method and apparatus for feeding multiple digesters |
| 08/13/1998 | WO1998035092A1 Method and device for the continuous cooking of chemical pulp |
| 08/13/1998 | WO1998035091A1 Method and device for the continuous cooking of pulp |
| 07/29/1998 | EP0854953A2 Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor |
| 07/23/1998 | DE19653530C1 Verfahren und Vorrichtung zur Prozeßführung und zur Prozeßoptimierung bei der Herstellung von Zellstoff Method and apparatus for process management and for process optimization in the production of pulp |
| 07/02/1998 | WO1998028490A1 Method and device for conducting a process in the production of paper |
| 07/02/1998 | WO1998028487A1 Method and device for conducting a process in the production of cellulose |
| 07/01/1998 | EP0850415A1 Determination of sodium sulfide and sulfidity in green liquors and smelt solutions |
| 07/01/1998 | EP0850333A2 Process and arrangement for monitoring cellulose digestion |
| 06/23/1998 | US5770072 Multiple inlet valve with means to isolate each inlet individually and direct a reverse flow therethrough |
| 06/16/1998 | US5766418 Handling fibrous material used to produce cellulose pulp |
| 06/16/1998 | US5766413 Process for isothermal cooking pulp in a continuous digester |
| 06/09/1998 | US5762760 Reactor for treating pulp with a gas |
| 06/03/1998 | CN1183497A Plate type papermaking concentrated bluck liquor extracting machine |
| 05/26/1998 | US5755928 Method for automated monitoring of pulp retention time using an iodide salt as a tracer |
| 05/20/1998 | EP0842320A2 A feeding device for high pressure digestors |
| 05/19/1998 | US5753075 Slurry pumps, pulping |
| 05/07/1998 | WO1998019000A1 Method and system for feeding comminuted fibrous material |
| 05/07/1998 | DE19643884A1 Production process setting |
| 04/29/1998 | CN2280113Y Corrosion-proof rotary spherical digester |
| 04/28/1998 | US5744005 Self-supporting straining device for a continuous digester |
| 04/28/1998 | US5744004 System for feeding a suspension to a pressurized vessel |
| 04/16/1998 | WO1998015687A1 Method and apparatus for pulping with controlled heating to improve delignification and pulp strength |
| 04/15/1998 | CN1179188A Method and device for process control in cellulose and/or paper manufacture |
| 04/08/1998 | EP0834051A1 Method and apparatus for treating material which conducts heat poorly |
| 04/07/1998 | US5736006 Steaming comminuted cellulose fibers, slurrying with kraft liquor, pressurizing, hydraulically feeding to treatment vessesl, heating by contacting with hot kraft cooking liquid |
| 04/07/1998 | US5736005 Scraper device for a continuous digester |
| 03/25/1998 | EP0673453B1 Process for continuous cooking of pulp |
| 02/25/1998 | EP0824616A1 A process for rapid acid hydrolisis of lignocellulosic material and hydrolisis reactor |
| 02/10/1998 | US5716497 Hot impregnated wood chips are fed into the top of countercurrent steam digester which has a bottom outlet and atleast one draw off screen girdle for removing black liquor, cooking liquour is fed to the top as fine droplets |
| 02/04/1998 | EP0822288A2 Continuous digester for the implementaion of dissolved solids profiling |
| 01/27/1998 | US5711600 High consistency pulp tower with a parting member and the introduction of dilution liquid |
| 01/09/1998 | CA2208936A1 Scale deposit inhibitor for kraft digesters and method for controlling scale deposition in kraft digisters |
| 01/07/1998 | EP0815315A2 Method and device for process control in cellulose and paper manufacture |
| 01/07/1998 | EP0746650A4 Pulping of fibrous plant materials and recovery of resultant by-products |
| 12/31/1997 | WO1997049861A1 Distributing device for paper pulp |
| 12/31/1997 | WO1997049860A1 Device for distributing suspensions, especially cellulose suspensions, in a container |
| 12/23/1997 | US5700355 Chip feeding for a continuous digester |
| 12/23/1997 | CA2050158C Process and apparatus for the discharge of a medium |
| 12/17/1997 | CN1036728C Cooking and process for continuous cooking of pulp |
| 12/16/1997 | US5698079 Arrangement for spreading paper pulp in a container |
| 12/10/1997 | EP0811088A1 A screen having inclined slots for use in a continuous digester |
| 12/10/1997 | EP0627030A4 Modified digestion of paper pulp followed by ozone bleaching. |
| 11/27/1997 | DE19613985C1 Analysis of cellulose characteristics |
| 11/12/1997 | EP0594740B1 Method and apparatus for separating gas from a gaseous material |
| 10/28/1997 | US5681453 Reciprocal movable screens in a vertically elongated vessel |
| 10/28/1997 | US5681427 Apparatus for treating pulp produced by solvent pulping |
| 10/28/1997 | US5680995 Continuous digester |
| 10/23/1997 | WO1997039181A1 Method and apparatus for filling a pulp tower |
| 10/23/1997 | WO1997039178A1 System for feeding a suspension to a pressurized vessel |
| 10/23/1997 | WO1997039177A1 Feeding device for moist material at high gas pressure |
| 10/16/1997 | WO1997038157A1 Process for continuously guiding liquids when digesting pulp in a digester |
| 10/16/1997 | WO1997038156A1 Process for continuously supplying liquid during the boiling of cellulose in a boiler |
| 10/15/1997 | CN2264753Y Digester for ramie degumming |
| 10/07/1997 | USH1681 Discharge from pulping vessels without the aid of mechanical agitation |
| 10/07/1997 | US5674360 Method and apparatus for steam packing/presteaming a batch digester |
| 09/30/1997 | US5672245 Rejected flow from cooking pulp consisting of knots is returned to chip chute after concentration and washing |
| 09/24/1997 | EP0685015B1 Straining device |
| 09/17/1997 | CN2262563Y Corrosion-proof rotary spherical digester |
| 09/12/1997 | WO1997033035A1 A process for rapid acid hydrolisis of lignocellulosic material and hydrolisis reactor |
| 09/03/1997 | EP0792394A1 Black liquor impregnation in single-vessel hydraulic digester |
| 09/02/1997 | US5662775 Countercurrent cooking zone at first level and extraction screen at second level |
| 08/26/1997 | US5660686 Cooking with spent liquor pretreatment of cellulose material |
| 08/19/1997 | US5658428 Method for impregnation in a single-vessel hydraulic digester |
| 08/06/1997 | EP0669998B1 Digester for continuous cooking of fibre material |
| 07/23/1997 | CN2258190Y Wet feed-preparing apparatus for rotary spherical digester |
| 07/22/1997 | US5650045 Apparatus and method for wood pulp digester |
| 07/17/1997 | WO1997013916A3 Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor |
| 07/10/1997 | WO1997024486A1 Pumping of medium consistency, high temperature pulps from stand pipes |
| 07/09/1997 | EP0782642A1 Method and apparatus for the continuous production of cellulosic pulp |
| 07/02/1997 | CN2257300Y Hay loader |
| 07/01/1997 | US5643411 Process for operating a wood pulp digester sampling device |
| 06/11/1997 | CN1151459A Intermittence and continuous steaming tech. and appts. by means of sulphate method |
| 06/04/1997 | EP0776394A1 Enhancements in pulping with dissolved solids control |
| 06/04/1997 | EP0670924B1 Method of continuously cooking pulp |
| 06/03/1997 | US5635025 Digester system containing a single vessel serving as all of a chip bin, steaming vessel, and chip chute |
| 05/21/1997 | EP0673452B1 Digester for continuous cooking of fibre material |
| 05/13/1997 | US5628873 Chip bin assembly including a hollow transition with one dimensional convergence and side relief |
| 05/09/1997 | WO1997010384A3 Process and arrangement for monitoring cellulose digestion |
| 05/07/1997 | CN1034824C Straining device |
| 04/22/1997 | US5622598 Feeding wood chips entrained in liquor to high pressure vessel |
| 04/17/1997 | WO1997013916A2 Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor |
| 04/17/1997 | CA2234221A1 Process for determining the final point of pulp cooking and an arrangement for controlling the pulp cooking time in a reactor |
| 04/15/1997 | US5620562 Continuous digestion of kraft pulp while maintaining low concentrations of dissolved organic materials yields increased strength and bleachability |
| 04/09/1997 | CN1147042A Straw digesting pulp-making process, method and system for recovery of waste wash liquor thereof |
| 04/08/1997 | US5617975 Chip feed system |
| 04/01/1997 | US5616214 In situ |
| 03/26/1997 | CN1145966A High-efficiency and energy-saving combined black straw pulp liquor extractor |
| 03/20/1997 | WO1997010501A1 Determination of sodium sulfide and sulfidity in green liquors and smelt solutions |
| 03/20/1997 | WO1997010384A2 Process and arrangement for monitoring cellulose digestion |
| 03/20/1997 | CA2232171A1 Process and arrangement for monitoring the cooking of pulp |
| 03/19/1997 | EP0763622A2 Continuous solvent pulping and washing processes and apparatus |
| 03/12/1997 | EP0670925B1 Top circulation line cooling for a modified cook digester |
| 03/11/1997 | US5609729 Apparatus for controlling liquid level in a knot drainer |
| 03/06/1997 | WO1997005326A3 A feeding device for high pressure digestors |