Refining device
US-12508601-B2 · Dec 30, 2025 · US
Other mills or refiners
Other mills or refiners · 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 | D21D1/34 |
| Official title | Other mills or refiners |
| Display label | Other mills or refiners |
| Total patents | 25 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2018 | 3 |
| 2019 | 2 |
| 2021 | 4 |
| 2022 | 3 |
| 2023 | 4 |
| 2024 | 5 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Highly refined cellulose pulp composition with compression refined cellulose pulp
US-2025250742-A1 · Aug 7, 2025 · US
Pretreatment methods for cotton textile waste fabric
US-12351983-B2 · Jul 8, 2025 · US
Arrangement and method for adjusting blade gap in refiner
US-12091819-B2 · Sep 17, 2024 · US
Paper filler composition
US-2024240400-A1 · Jul 18, 2024 · US
Method for Manufacturing Refining Segment and Refining Segment
US-2024150962-A1 · May 9, 2024 · US
Paper filler composition
US-11970817-B2 · Apr 30, 2024 · US
Refining device
US-2024024885-A1 · Jan 25, 2024 · US
Paper filler composition
US-11732411-B2 · Aug 22, 2023 · US
Pretreatment methods for cotton textile waste fabric
US-2023175205-A1 · Jun 8, 2023 · US
Flinger apparatus for a counter-rotating refiner
US-11628446-B2 · Apr 18, 2023 · US
System and method of producing micro fibrillated cellulose (MFC)
US-2023071986-A1 · Mar 9, 2023 · US
Paper filler composition
US-2022364305-A1 · Nov 17, 2022 · US
Paper filler composition
US-11377791-B2 · Jul 5, 2022 · US
Paper filler composition
US-2022018068-A1 · Jan 20, 2022 · US
Paper filler composition
US-11162219-B2 · Nov 2, 2021 · US
Method for treating biomass and device for treating biomass
US-11162216-B2 · Nov 2, 2021 · US
Arrangement and method for adjusting blade gap in refiner
US-2021180251-A1 · Jun 17, 2021 · US
Flinger apparatus for a counter-rotating refiner
US-2021086189-A1 · Mar 25, 2021 · US
Method for treating biomass and device for treating biomass
US-2019345671-A1 · Nov 14, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21D1/34?
- CPC D21D1/34 is the Cooperative Patent Classification code for “Other mills or refiners.”
- How many patents are filed under CPC D21D1/34 (Other mills or refiners)?
- Our database includes 25 publications tagged with this CPC code.
- Is patent activity under CPC D21D1/34 growing?
- Publication counts under this code: 5 in 2024 vs 3 in 2025 (latest complete years).