Process to optimize brown stock washing unit operations
US-12503814-B2 · Dec 23, 2025 · US
in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces}
in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces} · 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 | D21C9/06 |
| Official title | in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces} |
| Display label | in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces} |
| Total patents | 47 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 6 |
| 2016 | 5 |
| 2017 | 7 |
| 2018 | 4 |
| 2019 | 6 |
| 2020 | 1 |
| 2021 | 4 |
| 2022 | 3 |
| 2023 | 3 |
| 2024 | 4 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Lignin removal from lignocellulosic waste using rejected brine solution
US-2025305214-A1 · Oct 2, 2025 · US
Lignin removal from lignocellulosic waste using rejected brine solution
US-12428783-B1 · Sep 30, 2025 · US
Method and arrangement for washer seal control
US-12331835-B2 · Jun 17, 2025 · US
Predictive control system and method for brown washing treatment in pulp mills
US-12077911-B2 · Sep 3, 2024 · US
Torque reaction arrangement for pulp washers
US-12024822-B2 · Jul 2, 2024 · US
Rotary drum vacuum filter with a throttling valve
US-11980837-B2 · May 14, 2024 · US
Method for fractionation of highly refined cellulose
US-2024141588-A1 · May 2, 2024 · US
Process for production of cellulose nanofibers from miscanthus x. giganteus and composites therefrom
US-2023313455-A1 · Oct 5, 2023 · US
Method and arrangement for washer seal control
US-2023304582-A1 · Sep 28, 2023 · US
Apparatus for washing and dewatering pulp, a system for controlling such an apparatus, and a method for processing pulp in such an apparatus
US-11702795-B2 · Jul 18, 2023 · US
Composition of matter feed to a head box
US-11512433-B2 · Nov 29, 2022 · US
Torque reaction arrangement for pulp washers
US-2022356644-A1 · Nov 10, 2022 · US
Process to optimize brown stock washing unit operations
US-2022251781-A1 · Aug 11, 2022 · US
Method for producing hydroxypropyl methyl cellulose
US-11136415-B2 · Oct 5, 2021 · US
Vacuum filter
US-2021252436-A1 · Aug 19, 2021 · US
Predictive control system and method for brown washing treatment in pulp mills
US-2021148047-A1 · May 20, 2021 · US
Method of producing dissolving pulp
US-2021040688-A1 · Feb 11, 2021 · US
Composition of matter feed to a head box
US-2020063359-A1 · Feb 27, 2020 · US
Drum washer with gravity assist drainage
US-2019388809-A1 · Dec 26, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C9/06?
- CPC D21C9/06 is the Cooperative Patent Classification code for “in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces}.”
- How many patents are filed under CPC D21C9/06 (in filters {; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces})?
- Our database includes 47 publications tagged with this CPC code.
- Is patent activity under CPC D21C9/06 growing?
- Publication counts under this code: 4 in 2024 vs 4 in 2025 (latest complete years).