Method for producing bleached wood fibre material
US-2021254280-A1 · Aug 19, 2021 · US
by chemical means
by chemical means · 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 | D21B1/021 |
| Official title | {by chemical means} |
| Display label | by chemical means |
| Total patents | 84 |
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 | 7 |
| 2016 | 13 |
| 2017 | 15 |
| 2018 | 6 |
| 2019 | 7 |
| 2020 | 8 |
| 2021 | 10 |
| 2022 | 5 |
| 2023 | 8 |
| 2024 | 2 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Materials containing cellulose nanofibers
US-2021246609-A1 · Aug 12, 2021 · US
Defibrating method, fiber body forming method, and defibrating machine
US-2021156087-A1 · May 27, 2021 · US
Method for recovering pulp fibers from used absorbent article
US-10927496-B2 · Feb 23, 2021 · US
Method and system for recovering pulp fibers from used absorbent articles
US-2020346261-A1 · Nov 5, 2020 · US
Method and system for processing lignocellulose material
US-2020332375-A1 · Oct 22, 2020 · US
Economical methods for performing oxidative catalytic pretreatment of plant biomass using a homogeneous catalyst system
US-2020332376-A1 · Oct 22, 2020 · US
Rheology control of nanocellulose treatment fluids
US-2020263081-A1 · Aug 20, 2020 · US
Method for controlling thermoplasticity and toughness of redox-modified plant fiber and use thereof
US-2020199305-A1 · Jun 25, 2020 · US
Method for defibrating fiber body, defibrating device, sheet manufacturing method, and sheet manufacturing apparatus
US-2020173102-A1 · Jun 4, 2020 · US
Nanofibrillar cellulose product
US-10626191-B2 · Apr 21, 2020 · US
Method for recovering pulp fibers from used absorbent article
US-10533282-B2 · Jan 14, 2020 · US
Method for Producing a Fibrous Material
US-2019352849-A1 · Nov 21, 2019 · US
Method for recovering pulp fibers from used absorbent article
US-2019338463-A1 · Nov 7, 2019 · US
Nanocellulose-polymer composites, and processes for producing them
US-2019218372-A1 · Jul 18, 2019 · US
Process for individualizing trichomes
US-10344428-B2 · Jul 9, 2019 · US
Method for recovering pulp fibers from used absorbent article
US-2019169795-A1 · Jun 6, 2019 · US
Methods of using multi-ligand metal complexes to perform oxidative catalytic pretreatment of lignocellulosic biomass
US-2019091674-A1 · Mar 28, 2019 · US
Acanthophysium sp. KMF001 having high cellulase activity
US-10196621-B2 · Feb 5, 2019 · US
Sheet manufacturing apparatus
US-10137614-B2 · Nov 27, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21B1/021?
- CPC D21B1/021 is the Cooperative Patent Classification code for “by chemical means.”
- How many patents are filed under CPC D21B1/021 (by chemical means)?
- Our database includes 84 publications tagged with this CPC code.
- Is patent activity under CPC D21B1/021 growing?
- Publication counts under this code: 2 in 2024 vs 3 in 2025 (latest complete years).