Biomass direct reduced iron
US-2025179596-A1 · Jun 5, 2025 · US
in hearth-type furnaces
in hearth-type furnaces · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C21B13/10 |
| Official title | in hearth-type furnaces |
| Display label | in hearth-type furnaces |
| Total patents | 34 |
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 | 5 |
| 2016 | 3 |
| 2017 | 5 |
| 2018 | 6 |
| 2019 | 5 |
| 2020 | 3 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Coffee as a carbon source in the preparation of iron and ferro-alloys
US-2024175100-A1 · May 30, 2024 · US
Biomass direct reduced iron
US-2023407423-A1 · Dec 21, 2023 · US
Biomass direct reduced iron
US-2023332258-A1 · Oct 19, 2023 · US
Method for smelting oxide ore
US-11479832-B2 · Oct 25, 2022 · US
Rotary hearth furnace, and method for producing reduced iron using rotary hearth furnace
US-11428468-B2 · Aug 30, 2022 · US
Ironmaking system and ironmaking process of two-section downdraft bed
US-2022213567-A1 · Jul 7, 2022 · US
Classified reduction gasification iron smelting process of iron ore powder and coal powder in a Y-type entrained flow bed
US-10801081-B2 · Oct 13, 2020 · US
Classified reduction gasification iron smelting process of iron ore powder and coal powder in a y-type entrained flow bed
US-2020140966-A1 · May 7, 2020 · US
Reduced iron production method and device
US-10571193-B2 · Feb 25, 2020 · US
Rotary hearth furnace, and method for producing reduced iron using rotary hearth furnace
US-2019301800-A1 · Oct 3, 2019 · US
Method for smelting nickel oxide ore
US-10364480-B2 · Jul 30, 2019 · US
Method for smelting saprolite ore
US-10301704-B2 · May 28, 2019 · US
Rotary hearth furnace
US-10294535-B2 · May 21, 2019 · US
Method for smelting oxide ore
US-2019144971-A1 · May 16, 2019 · US
Device for producing partially reduced iron
US-10155997-B2 · Dec 18, 2018 · US
Method for smelting nickel oxide ore
US-10072313-B2 · Sep 11, 2018 · US
Method for producing reduced iron
US-10017836-B2 · Jul 10, 2018 · US
Method and apparatus for treating iron-contained raw material using bath smelting furnace
US-2018087120-A1 · Mar 29, 2018 · US
Method for smelting saprolite ore
US-2018030574-A1 · Feb 1, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21B13/10?
- CPC C21B13/10 is the Cooperative Patent Classification code for “in hearth-type furnaces.”
- How many patents are filed under CPC C21B13/10 (in hearth-type furnaces)?
- Our database includes 34 publications tagged with this CPC code.
- Is patent activity under CPC C21B13/10 growing?
- Publication counts under this code: 1 in 2024 vs 1 in 2025 (latest complete years).