Method and corresponding apparatus for producing iron from direct reduction of iron ore
US-12509738-B2 · Dec 30, 2025 · US
in a continuous way by reduction from ores
in a continuous way by reduction from ores · 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 | C21B13/004 |
| Official title | {in a continuous way by reduction from ores} |
| Display label | in a continuous way by reduction from ores |
| Total patents | 66 |
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 | 4 |
| 2016 | 6 |
| 2017 | 2 |
| 2018 | 4 |
| 2019 | 2 |
| 2020 | 4 |
| 2021 | 2 |
| 2022 | 9 |
| 2023 | 13 |
| 2024 | 5 |
| 2025 | 14 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
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 producing sintered ore
US-12404566-B2 · Sep 2, 2025 · US
Method for iron making by continuous smelting reduction
US-12378614-B2 · Aug 5, 2025 · US
Direct reduction system and related process
US-12365955-B2 · Jul 22, 2025 · US
Biomass direct reduced iron
US-2025179596-A1 · Jun 5, 2025 · US
Method of reducing iron ore powder
US-2025163525-A1 · May 22, 2025 · US
Method for manufacturing carbonaceous material-containing agglomerate ore, and method for manufacturing molten pig iron
US-2025137080-A1 · May 1, 2025 · US
Cooperative emission reduction method for sintering using energy-carrying composite gas medium
US-12195822-B2 · Jan 14, 2025 · US
Method for carburization of HDRI produced in H2 based direct reduction process
US-12180554-B2 · Dec 31, 2024 · US
Hydrogen reduction of iron ore concentrate in loose layers and compacts
US-12163198-B2 · Dec 10, 2024 · US
Method for producing steel in an integrated metallurgical plant
US-2024271232-A1 · Aug 15, 2024 · US
Production of iron
US-11959153-B2 · Apr 16, 2024 · US
Hydrogen reduction of iron ore concentrate in loose layers and compacts
US-2024026475-A1 · Jan 25, 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
Method for direct reduction using vent gas
US-11773459-B2 · Oct 3, 2023 · US
Bio-reduction of metal ores integrated with biomass pyrolysis
US-11753698-B2 · Sep 12, 2023 · US
Method and device for direct reduction with dry vent gas de-dusting
US-2023250499-A1 · Aug 10, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21B13/004?
- CPC C21B13/004 is the Cooperative Patent Classification code for “in a continuous way by reduction from ores.”
- How many patents are filed under CPC C21B13/004 (in a continuous way by reduction from ores)?
- Our database includes 66 publications tagged with this CPC code.
- Is patent activity under CPC C21B13/004 growing?
- Publication counts under this code: 5 in 2024 vs 14 in 2025 (latest complete years).