Multilayer film comprising highly refined cellulose fibers
US-12258711-B2 · Mar 25, 2025 · US
paper or board consisting of two or more layers
paper or board consisting of two or more layers · 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 | D21F9/006 |
| Official title | {paper or board consisting of two or more layers} |
| Display label | paper or board consisting of two or more layers |
| Total patents | 33 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 3 |
| 2017 | 1 |
| 2018 | 3 |
| 2019 | 2 |
| 2020 | 6 |
| 2021 | 1 |
| 2022 | 6 |
| 2023 | 4 |
| 2024 | 3 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Light weight linerboard for corrugated board
US-12234605-B2 · Feb 25, 2025 · US
Paper products having increased bending stiffness and cross-direction strength and methods for making the same
US-12146264-B2 · Nov 19, 2024 · US
Barrier layers comprising nanocellulose onto the surface of paper or paperboard substrates at the wet end of a papermaking process
US-2024352675-A1 · Oct 24, 2024 · US
Barrier coatings applied to nanocellulose-coated paper and paperboard
US-2024167227-A1 · May 23, 2024 · US
Paper products having increased bending stiffness and cross-direction strength and methods for making the same
US-2023250582-A1 · Aug 10, 2023 · US
Foam-assisted application of uncooked starch and dry strength agents to paper products
US-2023160147-A1 · May 25, 2023 · US
Multilayer film comprising highly refined cellulose fibers
US-2023135217-A1 · May 4, 2023 · US
Light weight linerboard for corrugated board
US-2023019391-A1 · Jan 19, 2023 · US
Method of forming a three-layer board web and a forming section of forming a three-layer board web
US-11512431-B2 · Nov 29, 2022 · US
Method to produce a paperboard, a paperboard and a corrugated board
US-2022372706-A1 · Nov 24, 2022 · US
Paper products having increased bending stiffness and cross-direction strength and methods for making the same
US-11441268-B2 · Sep 13, 2022 · US
Method to produce a paperboard, a paperboard and a corrugated board
US-11441272-B2 · Sep 13, 2022 · US
Method for sizing a multi-ply fiber web and a forming section for a multi-ply fiber web
US-11299857-B2 · Apr 12, 2022 · US
Method for increasing the strength properties of a paper or board product
US-11214927-B2 · Jan 4, 2022 · US
Resilient high bulk tissue products
US-11035081-B2 · Jun 15, 2021 · US
Method of forming a three-layer board web and a forming section of forming a three-layer board web
US-2020407916-A1 · Dec 31, 2020 · US
A method to produce a paperboard, a paperboard and a corrugated board
US-2020332468-A1 · Oct 22, 2020 · US
Resilient high bulk tissue products
US-2020240086-A1 · Jul 30, 2020 · US
Method for Sizing a Multi-ply Fiber Web and a Forming Section for a Multi-ply Fiber Web
US-2020115854-A1 · Apr 16, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21F9/006?
- CPC D21F9/006 is the Cooperative Patent Classification code for “paper or board consisting of two or more layers.”
- How many patents are filed under CPC D21F9/006 (paper or board consisting of two or more layers)?
- Our database includes 33 publications tagged with this CPC code.
- Is patent activity under CPC D21F9/006 growing?
- Publication counts under this code: 3 in 2024 vs 2 in 2025 (latest complete years).