Class D21C : PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
Subclass 3/06: Pulping cellulose-containing materials (digesters D21C 7/00) with acids, acid salts, or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites
| Patent # | Title | Filing Date | Issue Date | Patent Owner |
|---|---|---|---|---|
| 12188181 | Sulfite-based processes for producing nanocellulose, and compositions and products produced therefrom | Oct 18, 21 | Jan 07, 25 | GranBio Intellectual Property Holdings, LLC |
| 12123138 | Arylsulfonic acid—modified sulfuric acid and uses thereof | Aug 20, 21 | Oct 22, 24 | SixRing Inc. |
| 12116729 | Common preparation of lignocellulosic feedstock and a product containing cellulose but free from lignin | May 29, 20 | Oct 15, 24 | Chemiefaser Lenzing Aktiengesellschaft |
| 12091818 | Processes for producing nanocellulose, and nanocellulose compositions produced therefrom | Mar 23, 21 | Sep 17, 24 | GranBio Intellectual Property Holdings, LLC |
| 12077910 | Nanocellulose production co-located at a pulp and paper mill | May 17, 21 | Sep 03, 24 | GranBio Intellectual Property Holdings, LLC |
| 11970816 | Dual surfactant digester additive composition and a method for enhancing the pulping of wood chips using the same | Aug 11, 21 | Apr 30, 24 | Chemstone Inc. |
| 11932706 | Processes and apparatus for producing nanocellulose, and compositions and products produced therefrom | Feb 01, 21 | Mar 19, 24 | GranBio Intellectual Property Holdings, LLC |
| 11834523 | Nanolignocellulose compositions and processes to produce these compositions | Jan 06, 21 | Dec 05, 23 | GranBio Intellectual Property Holdings, LLC |
| 11306113 | Process for the production of cellulose, lignocellulosic sugars, lignosulfonate, and ethanol | May 15, 20 | Apr 19, 22 | AMERICAN PROCESS INTERNATIONAL LLC |
| 11091875 | Dual surfactant digester additive composition and a method for enhancing the pulping of wood chips using the same | Nov 30, 17 | Aug 17, 21 | Chemstone Inc. |
| 10995314 | Sulfur dioxide and/or sulfurous acid pretreatment with sulfur dioxide recovery | Mar 16, 16 | May 04, 21 | Iogen Corporation |
| 10947670 | Drying/transportation and releasing MFC | Apr 07, 17 | Mar 16, 21 | Stora Enso Oyj |
| 10906994 | Processes and apparatus for producing nanocellulose, and compositions and products produced therefrom | Oct 04, 18 | Feb 02, 21 | GranBio Intellectual Property Holdings, LLC |
| 10704197 | Nanocellulose | Nov 21, 14 | Jul 07, 20 | THE UNIVERSITY OF QUEENSLAND |
| 10648008 | Lignocellulosic biomass conversion | Dec 16, 09 | May 12, 20 | Borregaard Industries Limited Norge |
| 10280559 | Process for producing increased bulk pulp fibers, pulp fibers obtained, and products incorporating same | Oct 25, 17 | May 07, 19 | International Paper Company |
| 10093748 | Processes and apparatus for producing nanocellulose, and compositions and products produced therefrom | Sep 30, 16 | Oct 09, 18 | API Intellectual Property Holdings, LLC |
| 9856605 | Integration of non-woody biorefining at pulp and paper plants | Mar 30, 15 | Jan 02, 18 | API INTELLECTUAL PROPERTY HOLDINGS, LLC |
| 9777429 | Continuous process for production of cellulose pulp from grass-like plant feedstock | Mar 31, 14 | Oct 03, 17 | Not available |
| 9765478 | Treatment of biomass to dissolve lignin with ionic liquid composition | Dec 15, 11 | Sep 19, 17 | IMPERIAL INNOVATIONS LIMITED |
| Publication # | Title | Filing Date | Pub Date | Patent Owner |
|---|---|---|---|---|
| 2025/0059,707 | NANOCELLULOSE PRODUCTION CO-LOCATED AT A PULP AND PAPER MILL | Aug 30, 24 | Feb 20, 25 | Not available |
| 2025/0052,002 | OPTIMIZATION OF CHEMICAL CONSUMPTION IN BIOMASS DELIGNIFICATION | Feb 09, 24 | Feb 13, 25 | Not available |
| 2024/0247,081 | PROCESSES AND APPARATUS FOR PRODUCING NANOCELLULOSE, AND COMPOSITIONS AND PRODUCTS PRODUCED THEREFROM | Feb 09, 24 | Jul 25, 24 | Not available |
| 2018/0298,113 | NANOLIGNOCELLULOSE COMPOSITIONS AND PROCESSES TO PRODUCE THESE COMPOSITIONS | Jun 21, 18 | Oct 18, 18 | Not available |
| 2018/0251,941 | NANOCELLULOSE PRODUCTION CO-LOCATED AT A PULP AND PAPER MILL | Aug 29, 16 | Sep 06, 18 | Not available |
| 2016/0237,173 | NANOCELLULOSE PRODUCTION USING LIGNOSULFONIC ACID | Apr 25, 16 | Aug 18, 16 | API INTELLECTUAL PROPERTY HOLDINGS, LLC |
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