Multilayer film comprising highly refined cellulose fibers
US-12595627-B2 · Apr 7, 2026 · US
Wet end of machines for making continuous webs of paper
Wet end of machines for making continuous webs of paper · 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 | D21F1/00 |
| Official title | Wet end of machines for making continuous webs of paper |
| Display label | Wet end of machines for making continuous webs of paper |
| Total patents | 49 |
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 | 2 |
| 2017 | 2 |
| 2019 | 4 |
| 2020 | 6 |
| 2021 | 4 |
| 2022 | 11 |
| 2023 | 8 |
| 2024 | 4 |
| 2025 | 5 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for manufacturing films comprising highly refined cellulose fibers
US-12467202-B2 · Nov 11, 2025 · US
Multilayer film comprising highly refined cellulose fibers
US-12258711-B2 · Mar 25, 2025 · US
Multilayer film comprising highly refined cellulose fibers
US-12258710-B2 · Mar 25, 2025 · US
Method for suppressing sedimentation of suspended substance, method for suppressing pitch trouble, and method for detecting sedimentation of suspended substance
US-12247354-B2 · Mar 11, 2025 · US
Artificial leather and manufacture method thereof
US-2025034800-A1 · Jan 30, 2025 · US
Woven papermaking fabric having converging, diverging or merging topography
US-12180653-B2 · Dec 31, 2024 · US
Paper machine clothing
US-12077913-B2 · Sep 3, 2024 · US
Woven papermaking fabric having discrete cross-machine direction protuberances
US-11920302-B2 · Mar 5, 2024 · US
Woven papermaking fabric having intersecting twill patterns
US-11920301-B2 · Mar 5, 2024 · US
Method for manufacturing films comprising highly refined cellulose fibers
US-2023349099-A1 · Nov 2, 2023 · US
Woven papermaking fabric including stabilized weave providing textured contacting surface
US-11680369-B2 · Jun 20, 2023 · US
Multilayer film comprising highly refined cellulose fibers
US-2023151552-A1 · May 18, 2023 · US
Multilayer film comprising highly refined cellulose fibers
US-2023151545-A1 · May 18, 2023 · US
Multilayer film comprising highly refined cellulose fibers
US-2023151553-A1 · May 18, 2023 · US
Multilayer film comprising highly refined cellulose fibers
US-2023135217-A1 · May 4, 2023 · US
Paper machine clothing
US-2023079374-A1 · Mar 16, 2023 · US
Method and apparatus for producing a fiber web
US-11585047-B2 · Feb 21, 2023 · US
Woven papermaking fabric having converging, diverging or merging topography
US-2022372703-A1 · Nov 24, 2022 · US
Method for suppressing sedimentation of suspended substance, method for suppressing pitch trouble, and method for detecting sedimentation of suspended substance
US-2022325473-A1 · Oct 13, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21F1/00?
- CPC D21F1/00 is the Cooperative Patent Classification code for “Wet end of machines for making continuous webs of paper.”
- How many patents are filed under CPC D21F1/00 (Wet end of machines for making continuous webs of paper)?
- Our database includes 49 publications tagged with this CPC code.
- Is patent activity under CPC D21F1/00 growing?
- Publication counts under this code: 4 in 2024 vs 5 in 2025 (latest complete years).