Producing nanofibers, microfibers, and lignin from lignocellulosic biomass
US-2026022519-A1 · Jan 22, 2026 · US
Other features of pulping processes
Other features of pulping processes · 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 | D21C3/22 |
| Official title | Other features of pulping processes |
| Display label | Other features of pulping processes |
| Total patents | 59 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 7 |
| 2017 | 7 |
| 2018 | 6 |
| 2019 | 3 |
| 2020 | 5 |
| 2021 | 7 |
| 2022 | 6 |
| 2023 | 3 |
| 2024 | 10 |
| 2025 | 2 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Adjusting a high pressure feeder based on fluid leakage
US-12344994-B2 · Jul 1, 2025 · US
System and method of dynamic corrective enzyme selection and formulation for pulp and paper production
US-12286754-B2 · Apr 29, 2025 · US
Systems and techniques for controlling odor emissions from pulp mills
US-2024384467-A1 · Nov 21, 2024 · US
System and method of dynamic corrective enzyme selection and formulation for pulp and paper production
US-2024328088-A1 · Oct 3, 2024 · US
System for treatment of a biomass material
US-12098505-B2 · Sep 24, 2024 · US
Lignocellulosic composites prepared with aqueous alkaline and urea solutions in cold temperatures systems
US-12060679-B2 · Aug 13, 2024 · US
Paper filler composition
US-2024240400-A1 · Jul 18, 2024 · US
Method for obtaining information on quality of combustion of a liquor in a chemical recovery boiler and a method for controlling a chemical recovery boiler
US-12039239-B2 · Jul 16, 2024 · US
System and method of dynamic corrective enzyme selection and formulation for pulp and paper production
US-12031273-B2 · Jul 9, 2024 · US
Method of pulping cotton-based raw material
US-2024199765-A1 · Jun 20, 2024 · US
Paper filler composition
US-11970817-B2 · Apr 30, 2024 · US
Method of pulping cotton-based raw material
US-11939405-B2 · Mar 26, 2024 · US
Paper filler composition
US-11732411-B2 · Aug 22, 2023 · US
System for treatment of a biomass material and a method for connecting a valve to a transporting pipe
US-11674264-B2 · Jun 13, 2023 · US
Adjusting a high pressure feeder based on fluid leakage
US-2023081586-A1 · Mar 16, 2023 · US
Paper filler composition
US-2022364305-A1 · Nov 17, 2022 · US
Method of producing chemical pulp
US-11473241-B2 · Oct 18, 2022 · US
Paper filler composition
US-11377791-B2 · Jul 5, 2022 · US
System and method of dynamic corrective enzyme selection and formulation for pulp and paper production
US-2022186441-A1 · Jun 16, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C3/22?
- CPC D21C3/22 is the Cooperative Patent Classification code for “Other features of pulping processes.”
- How many patents are filed under CPC D21C3/22 (Other features of pulping processes)?
- Our database includes 59 publications tagged with this CPC code.
- Is patent activity under CPC D21C3/22 growing?
- Publication counts under this code: 10 in 2024 vs 2 in 2025 (latest complete years).