Method of producing reduced iron
US-2026071287-A1 · Mar 12, 2026 · US
Use of special additives or fluxing agents
Use of special additives or 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 | C21B13/008 |
| Official title | {Use of special additives or fluxing agents} |
| Display label | Use of special additives or fluxing agents |
| Total patents | 40 |
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 | 5 |
| 2016 | 1 |
| 2018 | 1 |
| 2019 | 1 |
| 2020 | 1 |
| 2022 | 10 |
| 2023 | 7 |
| 2024 | 5 |
| 2025 | 5 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Non-fired pellets for reduction and method for producing same
US-2026043102-A1 · Feb 12, 2026 · US
Adjusting carbon content in direct reduced iron
US-2026043101-A1 · Feb 12, 2026 · US
Fired pellets for reduction and method for producing same
US-2026028688-A1 · Jan 29, 2026 · US
Biomass processing integrated with reduction of metal ores, systems for these processes, and products made therefrom
US-2025340960-A1 · Nov 6, 2025 · US
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
Method for iron making by continuous smelting reduction
US-12378614-B2 · Aug 5, 2025 · US
Biomass pyrolysis integrated with bio-reduction of metal ores, hydrogen production, and/or activated-carbon production
US-2025188565-A1 · Jun 12, 2025 · US
Molten steel production method
US-12276002-B2 · Apr 15, 2025 · US
Method for refining molten iron
US-2024392398-A1 · Nov 28, 2024 · US
Method for producing slag having a desired quality
US-2024376559-A1 · Nov 14, 2024 · US
Method for producing pellets fired in a pelletizing kiln
US-2024295005-A1 · Sep 5, 2024 · US
A method for manufacturing direct reduced iron
US-2024254576-A1 · Aug 1, 2024 · US
A method for manufacturing direct reduced iron
US-2024254575-A1 · Aug 1, 2024 · US
Biomass direct reduced iron
US-2023407423-A1 · Dec 21, 2023 · US
Biomass Direct Reduced Iron
US-2023366051-A1 · Nov 16, 2023 · US
Biomass direct reduced iron
US-2023332258-A1 · Oct 19, 2023 · US
Biomass Direct Reduced Iron
US-2023203607-A1 · Jun 29, 2023 · US
Method for producing liquid pig iron from a DRI product
US-2023175087-A1 · Jun 8, 2023 · US
Biomass Direct Reduced Iron
US-2023131754-A1 · Apr 27, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21B13/008?
- CPC C21B13/008 is the Cooperative Patent Classification code for “Use of special additives or fluxing agents.”
- How many patents are filed under CPC C21B13/008 (Use of special additives or fluxing agents)?
- Our database includes 40 publications tagged with this CPC code.
- Is patent activity under CPC C21B13/008 growing?
- Publication counts under this code: 5 in 2024 vs 5 in 2025 (latest complete years).