Class D21C : PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
Subclass 3/08: Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites calcium bisulfite
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 9556557 | Processes for producing cellulose pulp and pulp-derived products from lignocellulosic biomass | Apr 14, 16 | Jan 31, 17 | API INTELLECTUAL PROPERTY HOLDINGS, LLC |
| 9347176 | Processes for producing cellulose pulp, sugars, and co-products from lignocellulosic biomass | Oct 02, 13 | May 24, 16 | API INTELLECTUAL PROPERTY HOLDINGS, LLC |
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