Refining Segment
US-2024263395-A1 · Aug 8, 2024 · US
Discs
Discs · 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 | D21D1/306 |
| Official title | {Discs} |
| Display label | Discs |
| Total patents | 163 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 10 |
| 2016 | 5 |
| 2017 | 13 |
| 2018 | 10 |
| 2019 | 20 |
| 2020 | 15 |
| 2021 | 25 |
| 2022 | 16 |
| 2023 | 19 |
| 2024 | 23 |
| 2025 | 6 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Segmented rotor cap assembly
US-10697117-B2 · Jun 30, 2020 · US
Steam Evacuation in a Pulp or Fiber Refiner
US-2019388899-A1 · Dec 26, 2019 · US
Refiner plate segments with anti-lipping feature
US-2019376233-A1 · Dec 12, 2019 · US
Cast refiner plate segment with blunt edges and corners for safe handling
US-10501888-B2 · Dec 10, 2019 · US
Rotor refiner plate element for counter-rotating refiner having curved bars and serrated leading edges
US-10487450-B2 · Nov 26, 2019 · US
Blade element for refiner
US-10464068-B2 · Nov 5, 2019 · US
Feeding center plate in a pulp or fiber refiner
US-10449545-B2 · Oct 22, 2019 · US
Apparatus and method for processing wood fibers
US-2019316295-A1 · Oct 17, 2019 · US
Single-disc refiner
US-10441954-B2 · Oct 15, 2019 · US
Disperser plates with intermeshing teeth and outer refining section
US-2019301097-A1 · Oct 3, 2019 · US
Refiner
US-10400393-B2 · Sep 3, 2019 · US
Cleaning notches and passages for a feeding or refining element
US-2019264389-A1 · Aug 29, 2019 · US
Refiner plate segment with pre-dam
US-10378149-B2 · Aug 13, 2019 · US
Apparatus and method for processing wood fibers
US-2019203418-A1 · Jul 4, 2019 · US
Apparatus and method for processing wood fibers
US-2019203417-A1 · Jul 4, 2019 · US
Stator refiner plate element having curved bars and serrated leading edges
US-10337145-B2 · Jul 2, 2019 · US
Water relief groove to prevent cavitation of opposite refiner plate
US-2019184404-A1 · Jun 20, 2019 · US
Blade element for refiner
US-10300489-B2 · May 28, 2019 · US
Refiner segment in a fiber refiner
US-2019145048-A1 · May 16, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21D1/306?
- CPC D21D1/306 is the Cooperative Patent Classification code for “Discs.”
- How many patents are filed under CPC D21D1/306 (Discs)?
- Our database includes 163 publications tagged with this CPC code.
- Is patent activity under CPC D21D1/306 growing?
- Publication counts under this code: 23 in 2024 vs 6 in 2025 (latest complete years).