Non-fired pellets for reduction and method for producing same
US-2026043102-A1 · Feb 12, 2026 · US
Rotary hearth-type furnaces
Rotary 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 | C21B13/105 |
| Official title | {Rotary hearth-type furnaces} |
| Display label | Rotary 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 declining.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 2 |
| 2017 | 2 |
| 2018 | 4 |
| 2019 | 5 |
| 2020 | 4 |
| 2022 | 3 |
| 2023 | 1 |
| 2024 | 4 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Fired pellets for reduction and method for producing same
US-2026028688-A1 · Jan 29, 2026 · US
Direct bath smelting process with fast quench of molten material in hot offgas
US-2024279757-A1 · Aug 22, 2024 · US
Method for producing agglomerated ore, method for producing reduced iron, agglomerated ore, sintering machine and pellet firing furnace
US-2024279758-A1 · Aug 22, 2024 · US
Reduced iron production method and reduced iron production device
US-2024175101-A1 · May 30, 2024 · US
Raw material particles for production of agglomerate, method for producing raw material particles for production of agglomerate, agglomerate, method for producing agglomerate, and method for producing reduced iron
US-2024167110-A1 · May 23, 2024 · US
Oxide ore smelting method
US-11608543-B2 · Mar 21, 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
Reduced iron production method
US-11293068-B2 · Apr 5, 2022 · US
Reduced iron production method
US-2020291494-A1 · Sep 17, 2020 · US
Rotary bed-type electric furnace
US-10746467-B2 · Aug 18, 2020 · US
Reduced iron manufacturing method
US-10683562-B2 · Jun 16, 2020 · US
Rotary bed-type electric furnace
US-2020158434-A1 · May 21, 2020 · US
Rotary hearth furnace, and method for producing reduced iron using rotary hearth furnace
US-2019301800-A1 · Oct 3, 2019 · US
Production method of granular metallic iron
US-10407744-B2 · Sep 10, 2019 · US
Rotary hearth furnace
US-10294535-B2 · May 21, 2019 · US
Method for smelting oxide ore
US-2019144971-A1 · May 16, 2019 · US
Oxide ore smelting method
US-2019119779-A1 · Apr 25, 2019 · US
Process for manufacturing reduced iron agglomerates
US-10144981-B2 · Dec 4, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21B13/105?
- CPC C21B13/105 is the Cooperative Patent Classification code for “Rotary hearth-type furnaces.”
- How many patents are filed under CPC C21B13/105 (Rotary hearth-type furnaces)?
- Our database includes 34 publications tagged with this CPC code.
- Is patent activity under CPC C21B13/105 growing?
- Publication counts under this code: 1 in 2023 vs 4 in 2024 (latest complete years).