Method for the direct reduction of iron ore
US-2025283186-A1 · Sep 11, 2025 · US
Introducing coolant gas in the shaft furnaces · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C21B13/029 |
| Official title | {Introducing coolant gas in the shaft furnaces} |
| Display label | Introducing coolant gas in the shaft furnaces |
| Total patents | 17 |
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 1 |
| 2017 | 2 |
| 2021 | 1 |
| 2022 | 1 |
| 2024 | 6 |
| 2025 | 4 |
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
US-2025283186-A1 · Sep 11, 2025 · US
US-2025257416-A1 · Aug 14, 2025 · US
US-2025207211-A1 · Jun 26, 2025 · US
US-12286679-B2 · Apr 29, 2025 · US
US-12180554-B2 · Dec 31, 2024 · US
US-2024410027-A1 · Dec 12, 2024 · US
US-2024400384-A1 · Dec 5, 2024 · US
US-2024279767-A1 · Aug 22, 2024 · US
US-2024263259-A1 · Aug 8, 2024 · US
US-2024263260-A1 · Aug 8, 2024 · US
US-2022389528-A1 · Dec 8, 2022 · US
US-2021246521-A1 · Aug 12, 2021 · US
US-9797026-B2 · Oct 24, 2017 · US
US-9725778-B2 · Aug 8, 2017 · US
US-9328395-B2 · May 3, 2016 · US
US-2015184264-A1 · Jul 2, 2015 · US
US-8940076-B2 · Jan 27, 2015 · US