Highly refined pulp from fibers obtained from used beverage cartons
US-2025043512-A1 · Feb 6, 2025 · US
Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F)
Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) · 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 | D21D1/00 |
| Official title | Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) |
| Display label | Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F) |
| Total patents | 39 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2017 | 1 |
| 2018 | 1 |
| 2019 | 5 |
| 2020 | 5 |
| 2021 | 9 |
| 2022 | 4 |
| 2023 | 7 |
| 2024 | 6 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
A Method for Treating Textile Fibers of Different Lengths
US-2024410111-A1 · Dec 12, 2024 · US
Refined cellulose fiber composition
US-12084563-B2 · Sep 10, 2024 · US
Refining Segment
US-2024263395-A1 · Aug 8, 2024 · US
Double-disc refiner
US-12012695-B2 · Jun 18, 2024 · US
System and method of producing micro fibrillated cellulose (MFC)
US-12006628-B2 · Jun 11, 2024 · US
Method for producing softwood-derived pulp fibers for paper and softwood-derived pulp fibers for paper
US-11879210-B2 · Jan 23, 2024 · US
Monitoring and controlling of refining of fibrous pulp
US-11788229-B2 · Oct 17, 2023 · US
System and Method of Producing Micro Fibrillated Cellulose (MFC)
US-2023193558-A1 · Jun 22, 2023 · US
Blade Element for Refiner
US-2023183921-A1 · Jun 15, 2023 · US
Grinding method and grinding medium
US-2023138194-A1 · May 4, 2023 · US
Fiber blend, method for producing fiber blend, and paperboard product comprising fiber blend
US-11629460-B2 · Apr 18, 2023 · US
Method for preparing unbleached biomechanical pulp from straw
US-11624154-B2 · Apr 11, 2023 · US
Grinding method and grinding medium
US-11572658-B2 · Feb 7, 2023 · US
Refined cellulose fiber composition
US-2022363871-A1 · Nov 17, 2022 · US
Paper products and pulps with surface enhanced pulp fibers and increased absorbency, and methods of making same
US-11441271-B2 · Sep 13, 2022 · US
Double-disc refiner
US-2022186437-A1 · Jun 16, 2022 · US
Method for producing softwood-derived pulp fibers for paper and softwood-derived pulp fibers for paper
US-2022074138-A1 · Mar 10, 2022 · US
Method for preparing nanocellulose
US-11193239-B2 · Dec 7, 2021 · US
Method and arrangement for producing nanofibrillar cellulose
US-2021301470-A1 · Sep 30, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21D1/00?
- CPC D21D1/00 is the Cooperative Patent Classification code for “Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F).”
- How many patents are filed under CPC D21D1/00 (Methods of beating or refining; Beaters of the Hollander type (knotter screens D21F))?
- Our database includes 39 publications tagged with this CPC code.
- Is patent activity under CPC D21D1/00 growing?
- Publication counts under this code: 6 in 2024 vs 1 in 2025 (latest complete years).