Extraction of delignified, cellulose-based fibers from natural plant material, and materials incorporating such fibers
US-2026055552-A1 · Feb 26, 2026 · US
in presence of S-containing compounds
in presence of S-containing compounds · Cooperative Patent Classification (CPC)
Textile and paper production, treatment, and products.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | D21C3/022 |
| Official title | {in presence of S-containing compounds} |
| Display label | in presence of S-containing compounds |
| Total patents | 44 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 4 |
| 2018 | 5 |
| 2019 | 1 |
| 2020 | 3 |
| 2021 | 6 |
| 2022 | 3 |
| 2023 | 6 |
| 2024 | 6 |
| 2025 | 4 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hemp paper packaging material for foodstuff
US-12553184-B2 · Feb 17, 2026 · US
Pulping methods, methods for manufacturing paperboard, and paperboard structures
US-12516472-B2 · Jan 6, 2026 · US
Evaporative devices having delignified plant materials, and systems and methods for fabrication and use thereof
US-12509822-B2 · Dec 30, 2025 · US
Strong and tough structural wood materials, and methods for fabricating and use thereof
US-2025162189-A1 · May 22, 2025 · US
Strong and tough structural wood materials, and methods for fabricating and use thereof
US-12285882-B2 · Apr 29, 2025 · US
Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby
US-12286750-B2 · Apr 29, 2025 · US
Hemp paper packaging material for foodstuff
US-2024337069-A1 · Oct 10, 2024 · US
Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby
US-2024328083-A1 · Oct 3, 2024 · US
Method of forming glass-like sheets using date palm seeds
US-12098506-B1 · Sep 24, 2024 · US
Process to obtain fully oxidized white liquor for use in the fiberline of a kraft pulp process
US-2024301622-A1 · Sep 12, 2024 · US
Lignocellulosic composites prepared with aqueous alkaline and urea solutions in cold temperatures systems
US-12060679-B2 · Aug 13, 2024 · US
Method for digesting lignocellulosic material
US-2024175205-A1 · May 30, 2024 · US
Process for production of cellulose nanofibers from miscanthus x. giganteus and composites therefrom
US-2023313455-A1 · Oct 5, 2023 · US
Evaporative devices having delignified plant materials, and systems and methods for fabrication and use thereof
US-2023203311-A1 · Jun 29, 2023 · US
Strong and tough structural wood materials, and methods for fabricating and use thereof
US-2023166427-A1 · Jun 1, 2023 · US
Extraction of delignified, cellulose-based fibers from natural plant material, and materials incorporating such fibers
US-2023160141-A1 · May 25, 2023 · US
Method for preparing dissolving pulp by TCF bleaching of poplar KP
US-11643777-B2 · May 9, 2023 · US
Strong and tough structural wood materials, and methods for fabricating and use thereof
US-11554514-B2 · Jan 17, 2023 · US
Method of producing chemical pulp
US-11473241-B2 · Oct 18, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C3/022?
- CPC D21C3/022 is the Cooperative Patent Classification code for “in presence of S-containing compounds.”
- How many patents are filed under CPC D21C3/022 (in presence of S-containing compounds)?
- Our database includes 44 publications tagged with this CPC code.
- Is patent activity under CPC D21C3/022 growing?
- Publication counts under this code: 6 in 2024 vs 4 in 2025 (latest complete years).