Paper filler composition
US-2024240400-A1 · Jul 18, 2024 · US
Pretreatment of the finely-divided materials before digesting (of waste paper D21C5/02)
Pretreatment of the finely-divided materials before digesting (of waste paper D21C5/02) · 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 | D21C1/00 |
| Official title | Pretreatment of the finely-divided materials before digesting (of waste paper D21C5/02) |
| Display label | Pretreatment of the finely-divided materials before digesting (of waste paper D21C5/02) |
| Total patents | 68 |
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 | 11 |
| 2016 | 9 |
| 2017 | 5 |
| 2018 | 8 |
| 2019 | 6 |
| 2020 | 5 |
| 2021 | 5 |
| 2022 | 6 |
| 2023 | 5 |
| 2024 | 6 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for production of cellulose particles
US-2023383108-A1 · Nov 30, 2023 · US
Paper filler composition
US-11732411-B2 · Aug 22, 2023 · US
A pre-hydrolysis pressure vessel system comprising a cleaning arrangement
US-2023256411-A1 · Aug 17, 2023 · US
System and method for treating biomass material
US-11565272-B2 · Jan 31, 2023 · US
Paper filler composition
US-2022364305-A1 · Nov 17, 2022 · US
Common preparation of lignocellulosic feedstock and a product containing cellulose but free from lignin
US-2022243399-A1 · Aug 4, 2022 · US
Paper filler composition
US-11377791-B2 · Jul 5, 2022 · US
Method and system for treating biomass
US-11371186-B2 · Jun 28, 2022 · US
Method and arrangement for feedback based control in chemical refining of wood
US-2022097252-A1 · Mar 31, 2022 · US
Paper filler composition
US-2022018068-A1 · Jan 20, 2022 · US
Reactor discharge screw
US-2021404116-A1 · Dec 30, 2021 · US
Method for impregnating biomass and device for impregnating biomass
US-11186949-B2 · Nov 30, 2021 · US
Paper filler composition
US-11162219-B2 · Nov 2, 2021 · US
Predictive control system and method for brown washing treatment in pulp mills
US-2021148047-A1 · May 20, 2021 · US
Process comprising acid pretreatment and enzymatic hydrolysis
US-11008598-B2 · May 18, 2021 · US
Production of fermentable sugars and lignin from biomass using supercritical fluids
US-10858712-B2 · Dec 8, 2020 · US
System and method for treating biomass material
US-2020346222-A1 · Nov 5, 2020 · US
Tobacco-derived nanocellulose material
US-10774472-B2 · Sep 15, 2020 · US
Processing device, sheet manufacturing apparatus, processing method, and manufacturing method of sheet
US-10626552-B2 · Apr 21, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C1/00?
- CPC D21C1/00 is the Cooperative Patent Classification code for “Pretreatment of the finely-divided materials before digesting (of waste paper D21C5/02).”
- How many patents are filed under CPC D21C1/00 (Pretreatment of the finely-divided materials before digesting (of waste paper D21C5/02))?
- Our database includes 68 publications tagged with this CPC code.
- Is patent activity under CPC D21C1/00 growing?
- Publication counts under this code: 6 in 2024 vs 1 in 2025 (latest complete years).