Apparatus for forming a substrate
US-12516457-B2 · Jan 6, 2026 · US
Head boxes of Fourdrinier machines
Head boxes of Fourdrinier machines · 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 | D21F1/02 |
| Official title | Head boxes of Fourdrinier machines |
| Display label | Head boxes of Fourdrinier machines |
| Total patents | 55 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 2 |
| 2018 | 3 |
| 2019 | 4 |
| 2020 | 8 |
| 2021 | 3 |
| 2022 | 6 |
| 2023 | 14 |
| 2024 | 7 |
| 2025 | 5 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Headbox for Manufacturing a Substrate
US-2025263889-A1 · Aug 21, 2025 · US
Method for manufacturing a film comprising highly refined cellulose fibers
US-12366036-B2 · Jul 22, 2025 · US
Headbox for manufacturing a substrate
US-12350130-B2 · Jul 8, 2025 · US
Continuous papermaking machines and methods for continuous papermaking
US-2025092602-A1 · Mar 20, 2025 · US
Light weight linerboard for corrugated board
US-12234605-B2 · Feb 25, 2025 · US
Controlling the slice flow of a slurry through a headbox
US-12157975-B2 · Dec 3, 2024 · US
Paper products having increased bending stiffness and cross-direction strength and methods for making the same
US-12146264-B2 · Nov 19, 2024 · US
Apparatus for forming a substrate
US-2024279856-A1 · Aug 22, 2024 · US
Headbox for manufacturing a substrate
US-2024225911-A1 · Jul 11, 2024 · US
Device and method for producing a fibrous web
US-12006631-B2 · Jun 11, 2024 · US
Headbox for manufacturing a substrate
US-11963851-B2 · Apr 23, 2024 · US
Device for producing a composite nonwoven web
US-2024044059-A1 · Feb 8, 2024 · US
Crescent former for producing tissue paper
US-11834788-B2 · Dec 5, 2023 · US
Elongated component for a manufacturing machine of a fibrous cellulosic web, its use and method for recycling
US-11814793-B2 · Nov 14, 2023 · US
Paper producing apparatus
US-11788230-B2 · Oct 17, 2023 · US
Method for manufacturing a film comprising highly refined cellulose fibers
US-2023313464-A1 · Oct 5, 2023 · US
Absorbent Product with Improved Capillary Pressure and Saturation Capacity
US-2023250586-A1 · Aug 10, 2023 · US
Paper products having increased bending stiffness and cross-direction strength and methods for making the same
US-2023250582-A1 · Aug 10, 2023 · US
Flow-optimized edge treatment
US-2023235508-A1 · Jul 27, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21F1/02?
- CPC D21F1/02 is the Cooperative Patent Classification code for “Head boxes of Fourdrinier machines.”
- How many patents are filed under CPC D21F1/02 (Head boxes of Fourdrinier machines)?
- Our database includes 55 publications tagged with this CPC code.
- Is patent activity under CPC D21F1/02 growing?
- Publication counts under this code: 7 in 2024 vs 5 in 2025 (latest complete years).