Method for producing direct reduction iron
US-2024410027-A1 · Dec 12, 2024 · US
Making spongy iron or liquid steel, by direct processes
Making spongy iron or liquid steel, by direct processes · 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 | C21B13/00 |
| Official title | Making spongy iron or liquid steel, by direct processes |
| Display label | Making spongy iron or liquid steel, by direct processes |
| Total patents | 68 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 6 |
| 2016 | 15 |
| 2017 | 11 |
| 2018 | 3 |
| 2019 | 5 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 5 |
| 2023 | 2 |
| 2024 | 8 |
| 2025 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for producing an iron melt
US-2024344155-A1 · Oct 17, 2024 · US
Method of manufacturing steel
US-2024229174-A9 · Jul 11, 2024 · US
A method of manufacturing of a steel product in several steelmaking units
US-2024229175-A9 · Jul 11, 2024 · US
A method of manufacturing of a steel product in several steelmaking units
US-2024132984-A1 · Apr 25, 2024 · US
Manufacturing method of a steel product
US-2024132981-A1 · Apr 25, 2024 · US
Method for direct reduction using vent gas
US-11773459-B2 · Oct 3, 2023 · US
Biomass Direct Reduced Iron
US-2023203606-A1 · Jun 29, 2023 · US
Biomass pyrolysis integrated with bio-reduction of metal ores, hydrogen production, and/or activated-carbon production
US-2022162725-A1 · May 26, 2022 · US
Biomass pyrolysis integrated with bio-reduction of metal ores, hydrogen production, and/or activated-carbon production
US-2022162064-A1 · May 26, 2022 · US
Biomass pyrolysis integrated with bio-reduction of metal ores, hydrogen production, and/or activated-carbon production
US-2022162726-A1 · May 26, 2022 · US
Biomass pyrolysis integrated with bio-reduction of metal ores, hydrogen production, and/or activated-carbon production
US-2022162076-A1 · May 26, 2022 · US
Biomass pyrolysis integrated with bio-reduction of metal ores, hydrogen production, and/or activated-carbon production
US-2022162077-A1 · May 26, 2022 · US
Exhaust gas treatment system
US-11135543-B2 · Oct 5, 2021 · US
Conveying a material to be conveyed
US-10947050-B2 · Mar 16, 2021 · US
Forming mineral in fractures in a geological formation
US-10900339-B2 · Jan 26, 2021 · US
Forming Mineral in Fractures in a Geological Formation
US-2020340342-A1 · Oct 29, 2020 · US
Method for direct reduction using vent gas
US-2020318206-A1 · Oct 8, 2020 · US
Reduced iron manufacturing method
US-10683562-B2 · Jun 16, 2020 · US
Conveying a material to be conveyed
US-2020165068-A1 · May 28, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21B13/00?
- CPC C21B13/00 is the Cooperative Patent Classification code for “Making spongy iron or liquid steel, by direct processes.”
- How many patents are filed under CPC C21B13/00 (Making spongy iron or liquid steel, by direct processes)?
- Our database includes 68 publications tagged with this CPC code.
- Is patent activity under CPC C21B13/00 growing?
- Publication counts under this code: 8 in 2024 vs 6 in 2025 (latest complete years).