Class D21C : PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
Subclass 3/14: Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites ammonium bisulfite
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 9765478 | Treatment of biomass to dissolve lignin with ionic liquid composition | Dec 15, 11 | Sep 19, 17 | IMPERIAL INNOVATIONS LIMITED |
| 8771465 | Raw Paper | Dec 09, 09 | Jul 08, 14 | Shandong Fuyin Paper & Environmental Protection Technology Co., Ltd |
| 8303772 | Method for preparing a grass-type unbleached paper product | Jul 25, 08 | Nov 06, 12 | Shandong Fuyin Paper & Environmental Protection Technology Co., Ltd, Shangdong Fuyin Paper & Environmental Protection Technology Co., Ltd., |
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