Class D21C : PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
Subclass 3/24: Pulping cellulose-containing materials (digesters D21C 7/00) Other features of pulping processes Continuous processes
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12077911 | Predictive control system and method for brown washing treatment in pulp mills | Nov 13, 20 | Sep 03, 24 | Buckman Laboratories International, Inc. |
| 11993895 | Method of feeding wood chips to a prehydrolysis reactor | Oct 02, 19 | May 28, 24 | Andritz Oy |
| 11834785 | Method of transforming high consistency pulp fibers into pre-dispersed semi-dry and dry fibrous materials | Sep 14, 17 | Dec 05, 23 | FPINNOVATIONS |
| 11485988 | Method for cooling and detoxifying biomass | Nov 19, 20 | Nov 01, 22 | Valmet AB |
| 11485989 | Method for cooling and detoxifying biomass | Nov 19, 20 | Nov 01, 22 | Valmet AB |
| 11473241 | Method of producing chemical pulp | May 15, 18 | Oct 18, 22 | Andritz Oy |
| 11371185 | Outlet system for transporting comminuted lignocellulosic material from a vessel and vessel comprising such an outlet system | Oct 28, 19 | Jun 28, 22 | Valmet AB |
| 11186948 | Method and a system for production of high molecular weight lignin | May 27, 16 | Nov 30, 21 | FIBRATECH PTE. LTD |
| 11001967 | Pulp-digester screen cleaner | Sep 22, 17 | May 11, 21 | Not available |
| 10815617 | Method for generation of clean steam in a continous digester system | May 16, 17 | Oct 27, 20 | Valmet AB |
| 10240287 | Heating of hydraulic digesters | Sep 10, 15 | Mar 26, 19 | Andritz Oy |
| 10151064 | Softwood kraft fiber having an improved α-cellulose content and its use in the production of chemical cellulose products | Feb 06, 14 | Dec 11, 18 | GP Cellulose GMbH |
| 10151063 | Cost efficient kraft cooking method using polysulfide cooking liquor | Aug 26, 14 | Dec 11, 18 | Valmet AB |
| 10053816 | Method for continuously cooking grass raw materials and device | Feb 28, 17 | Aug 21, 18 | Shandong Tralin Paper Co., Ltd |
| 9803317 | Method of digesting lignocellulosic material | Feb 08, 13 | Oct 31, 17 | BASF SE |
| 9777429 | Continuous process for production of cellulose pulp from grass-like plant feedstock | Mar 31, 14 | Oct 03, 17 | Not available |
| 9580864 | Kraft cooking method using polysulfide cooking liquor | Oct 03, 16 | Feb 28, 17 | VALMET AB |
| 9371612 | Method and apparatus to produce pulp using pre-hydrolysis and Kraft cooking | Feb 01, 12 | Jun 21, 16 | ANDRITZ INC. |
| 9328458 | Digester shell extension | May 20, 15 | May 03, 16 | VALMET AB |
| 9194080 | Two vessel reactor system and method for hydrolysis and digestion of wood chips with chemical enhanced wash method | May 15, 14 | Nov 24, 15 | ANDRITZ INC. |
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0052,002 | OPTIMIZATION OF CHEMICAL CONSUMPTION IN BIOMASS DELIGNIFICATION | Feb 09, 24 | Feb 13, 25 | Not available |
| 2019/0218,712 | METHOD FOR GENERATION OF CLEAN STEAM IN A CONTINOUS DIGESTER SYSTEM | May 16, 17 | Jul 18, 19 | Valmet AB |
| 2017/0022,664 | METHOD OF DIGESTING CELLULOSE FIBROUS MATERIAL IN A CONTINUOUS DIGESTER | Apr 02, 15 | Jan 26, 17 | STORA ENSO OYJ |
| 2001/0023,748 | Method and apparatus for continuously pulping cellulosic fibrous material | May 31, 01 | Sep 27, 01 | ANDRITZ INC. |
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