Method for melting direct reduced iron, solid iron and method for producing the same, material for civil engineering and construction and method for producing the same, and system for melting direct reduced iron
US-2025283185-A1 · Sep 11, 2025 · US
in electric furnaces
in electric 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 | C21B13/12 |
| Official title | in electric furnaces |
| Display label | in electric furnaces |
| Total patents | 73 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 5 |
| 2017 | 3 |
| 2018 | 2 |
| 2019 | 7 |
| 2020 | 5 |
| 2021 | 3 |
| 2022 | 5 |
| 2023 | 10 |
| 2024 | 12 |
| 2025 | 8 |
| 2026 | 10 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Biomass direct reduced iron
US-2025179596-A1 · Jun 5, 2025 · US
Electric furnace
US-2025093100-A1 · Mar 20, 2025 · US
Process and apparatus for direct reduction with electrically heated-up reduction gas
US-12209293-B2 · Jan 28, 2025 · US
Method for reducing carbon footprint in operating a metallurgical plant for producing pig iron
US-2025011888-A1 · Jan 9, 2025 · US
Method for producing agglomerated raw material
US-2024425942-A1 · Dec 26, 2024 · US
Process for detecting water leaks from smelting furnaces in metal or alloy production plants and related plant
US-12169157-B2 · Dec 17, 2024 · US
Method for refining molten iron
US-2024392398-A1 · Nov 28, 2024 · US
Method for refining molten iron
US-2024392400-A1 · Nov 28, 2024 · US
Method for producing slag having a desired quality
US-2024376559-A1 · Nov 14, 2024 · US
Method for producing an iron melt
US-2024344155-A1 · Oct 17, 2024 · US
Method of operating an electric arc furnace and steel mill
US-2024191314-A1 · Jun 13, 2024 · US
Spray cooling furnace electrodes with a cooling liquid that contains surfactants
US-11979968-B2 · May 7, 2024 · US
Production of iron
US-11959153-B2 · Apr 16, 2024 · US
Method of producing molten iron using electric furnace including video device
US-2024085110-A1 · Mar 14, 2024 · US
Refractory batch, a method for producing an unshaped refractory ceramic product from the batch and an unshaped refractory ceramic product obtained by the method
US-11905217-B2 · Feb 20, 2024 · US
Vessel for containing direct reduced iron
US-11859907-B2 · Jan 2, 2024 · US
Biomass direct reduced iron
US-2023407423-A1 · Dec 21, 2023 · US
Biomass Direct Reduced Iron
US-2023366051-A1 · Nov 16, 2023 · US
Melting/refining furnace for cold iron sources, and melting/refining furnace operation method
US-2023349016-A1 · Nov 2, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21B13/12?
- CPC C21B13/12 is the Cooperative Patent Classification code for “in electric furnaces.”
- How many patents are filed under CPC C21B13/12 (in electric furnaces)?
- Our database includes 73 publications tagged with this CPC code.
- Is patent activity under CPC C21B13/12 growing?
- Publication counts under this code: 12 in 2024 vs 8 in 2025 (latest complete years).