Use of cellulase to improve viscosity control of kraft dissolving pulp
US-2025314012-A1 · Oct 9, 2025 · US
Multistage processes
Multistage 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 | D21C3/26 |
| Official title | Multistage processes |
| Display label | Multistage processes |
| Total patents | 62 |
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 | 6 |
| 2017 | 9 |
| 2018 | 6 |
| 2019 | 5 |
| 2020 | 7 |
| 2021 | 10 |
| 2022 | 5 |
| 2023 | 5 |
| 2024 | 2 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Dissolution of cellulose in ionic liquids
US-12270152-B2 · Apr 8, 2025 · US
Aramid pulp and method for manufacturing the same
US-12258714-B2 · Mar 25, 2025 · US
System for treatment of a biomass material
US-12098505-B2 · Sep 24, 2024 · US
Method of feeding wood chips to a prehydrolysis reactor
US-11993895-B2 · May 28, 2024 · US
Monitoring and controlling of refining of fibrous pulp
US-11788229-B2 · Oct 17, 2023 · US
Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars
US-11773420-B2 · Oct 3, 2023 · US
Evaporative devices having delignified plant materials, and systems and methods for fabrication and use thereof
US-2023203311-A1 · Jun 29, 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
Extraction of delignified, cellulose-based fibers from natural plant material, and materials incorporating such fibers
US-2023160141-A1 · May 25, 2023 · US
Aramid pulp and method for manufacturing the same
US-2022389660-A1 · Dec 8, 2022 · US
Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars
US-11512334-B2 · Nov 29, 2022 · US
Outlet system for transporting comminuted lignocellulosic material from a vessel and vessel comprising such an outlet system
US-11371185-B2 · Jun 28, 2022 · US
Processes and systems for the pulping of lignocellulosic materials
US-11352746-B2 · Jun 7, 2022 · US
Method of feeding wood chips to a prehydrolysis reactor
US-2022002944-A1 · Jan 6, 2022 · US
Outlet system for transporting comminuted lignocellulosic material from a vessel and vessel comprising such an outlet system
US-2021309449-A1 · Oct 7, 2021 · US
Method for treating dissolving pulp
US-2021207321-A1 · Jul 8, 2021 · US
System for treatment of a biomass material and a method for connecting a valve to a transporting pipe
US-2021197155-A1 · Jul 1, 2021 · US
Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars
US-2021180098-A1 · Jun 17, 2021 · US
Process for enzymatic hydrolysis of lignocellulosic material and fermentation of sugars
US-2021115482-A1 · Apr 22, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C3/26?
- CPC D21C3/26 is the Cooperative Patent Classification code for “Multistage processes.”
- How many patents are filed under CPC D21C3/26 (Multistage processes)?
- Our database includes 62 publications tagged with this CPC code.
- Is patent activity under CPC D21C3/26 growing?
- Publication counts under this code: 2 in 2024 vs 4 in 2025 (latest complete years).