Method of producing hot metal using solid-reducing furnace and submerged arc furnace
US-2026071286-A1 · Mar 12, 2026 · US
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by applying additives, e.g. fluxing agents
by applying additives, e.g. fluxing agents · 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 | C21B3/02 |
| Official title | by applying additives, e.g. fluxing agents |
| Display label | by applying additives, e.g. fluxing agents |
| Total patents | 16 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 1 |
| 2023 | 2 |
| 2024 | 2 |
| 2025 | 2 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method of producing reduced iron
US-2026071287-A1 · Mar 12, 2026 · US
A method for manufacturing pig iron in an electrical smelting furnace and associated electrical smelting furnace
US-2026043100-A1 · Feb 12, 2026 · US
Method for producing pig iron
US-2026043098-A1 · Feb 12, 2026 · US
Production method of pig iron
US-12545970-B2 · Feb 10, 2026 · US
Method for manufacturing pig iron into an electrical smelting furnace and associated smelting furnace
US-2026022428-A1 · Jan 22, 2026 · US
Method for iron making by continuous smelting reduction
US-12378614-B2 · Aug 5, 2025 · US
Method for producing high iron-content products from iron ore fines and biomass, and products thereof
US-2025154616-A1 · May 15, 2025 · US
Molten pig iron manufacturing method
US-2024368716-A1 · Nov 7, 2024 · US
Method for increasing the quality of graphite balls
US-2024035126-A1 · Feb 1, 2024 · US
Production method of pig iron
US-2023313328-A1 · Oct 5, 2023 · US
Method for iron making by continuous smelting reduction
US-2023082269-A1 · Mar 16, 2023 · US
Method and apparatus for treating iron-contained raw material using bath smelting furnace
US-2018087120-A1 · Mar 29, 2018 · US
Pulverized coal for pig-iron making comprising cow manure, and pig-iron production method using same
US-2017211160-A1 · Jul 27, 2017 · US
Green process for the preparation of pure iron
US-2016060726-A1 · Mar 3, 2016 · US
Method for recovering valuable metals
US-9203126-B2 · Dec 1, 2015 · US