A pre-hydrolysis pressure vessel system comprising a cleaning arrangement
US-2023256411-A1 · Aug 17, 2023 · US
Digesters
Digesters · 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 | D21C7/00 |
| Official title | Digesters |
| Display label | Digesters |
| Total patents | 74 |
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 | 10 |
| 2016 | 8 |
| 2017 | 7 |
| 2018 | 2 |
| 2019 | 7 |
| 2020 | 3 |
| 2021 | 11 |
| 2022 | 11 |
| 2023 | 4 |
| 2024 | 7 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
System for the processing and resupply of pulp as well as a method for the construction thereof
US-2022389656-A1 · Dec 8, 2022 · US
Method and device for treating biomass
US-11492752-B2 · Nov 8, 2022 · US
High consistency re-pulping method, apparatus and absorbent products incorporating recycled fiber
US-11486089-B2 · Nov 1, 2022 · US
Apparatus and process for treating biomass for on-site production of cellulolytic enzymes and method of using the enzymes to manufacture fuels and chemicals
US-2022298531-A1 · Sep 22, 2022 · US
Reactor arrangement and method for pre-hydrolysis of biomass material
US-11420180-B2 · Aug 23, 2022 · US
Method and system for treating biomass
US-11371186-B2 · Jun 28, 2022 · US
Method for separating lignin from ligno-cellulosic material
US-11306434-B2 · Apr 19, 2022 · US
Bale of virgin cellulose and cellulose ester
US-11286619-B2 · Mar 29, 2022 · US
Screen assembly for pulp digesters and other treatment vessels in pulp production
US-11255046-B2 · Feb 22, 2022 · US
An arrangement for installation of monitoring sensors of a treatment vessel for lignocellulosic material
US-2022018067-A1 · Jan 20, 2022 · US
Method of feeding wood chips to a prehydrolysis reactor
US-2022002944-A1 · Jan 6, 2022 · US
Reactor discharge screw
US-2021404116-A1 · Dec 30, 2021 · US
Method for separating lignin from ligno-cellulosic material
US-2021381163-A1 · Dec 9, 2021 · US
Method for impregnating biomass and device for impregnating biomass
US-11186949-B2 · Nov 30, 2021 · US
Method for recovery of cellulosic material from waste ligno-cellulosic material
US-11136715-B2 · Oct 5, 2021 · US
Method for recovery of cellulosic material from waste ligno-cellulosic material
US-2021269973-A1 · Sep 2, 2021 · US
A reactor vessel for biomass material
US-2021237024-A1 · Aug 5, 2021 · US
Method for isolating alpha cellulose from lignocellulosic materials
US-11078624-B2 · Aug 3, 2021 · US
Predictive control system and method for brown washing treatment in pulp mills
US-2021148047-A1 · May 20, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C7/00?
- CPC D21C7/00 is the Cooperative Patent Classification code for “Digesters.”
- How many patents are filed under CPC D21C7/00 (Digesters)?
- Our database includes 74 publications tagged with this CPC code.
- Is patent activity under CPC D21C7/00 growing?
- Publication counts under this code: 7 in 2024 vs 3 in 2025 (latest complete years).