Process for heavy metal removal from iron- and steelmaking flue dust
US-2026043110-A1 · Feb 12, 2026 · US
Blast furnaces
Blast furnaces · 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 | C21B7/00 |
| Official title | Blast furnaces |
| Display label | Blast furnaces |
| Total patents | 48 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 9 |
| 2017 | 5 |
| 2018 | 5 |
| 2019 | 5 |
| 2020 | 6 |
| 2021 | 1 |
| 2022 | 3 |
| 2023 | 1 |
| 2024 | 2 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for producing molten pig iron
US-2025179594-A1 · Jun 5, 2025 · US
Information processing method, information processing device, information processing system, information processing program, and method of operating a blast furnace
US-2024426728-A1 · Dec 26, 2024 · US
Supplied heat quantity estimation method, supplied heat quantity estimation device, supplied heat quantity estimation program, and blast furnace operation method
US-2024218472-A1 · Jul 4, 2024 · US
Optimal calculation method of energy operating condition in iron mill, optimal calculation device of energy operating condition in iron mill, and running method of iron mill
US-2023151447-A1 · May 18, 2023 · US
Blast furnace apparatus and operation method for blast furnace
US-11512899-B2 · Nov 29, 2022 · US
Skip hoist of a blast furnace
US-2022325367-A1 · Oct 13, 2022 · US
Device for mounting and/or dismantling staves in a shaft furnace
US-11268764-B2 · Mar 8, 2022 · US
Blast furnace apparatus and operation method for blast furnace
US-2021190426-A1 · Jun 24, 2021 · US
Automated control of circumferential variability of blast furnace
US-10755200-B2 · Aug 25, 2020 · US
Method for automated control of circumferential variability of blast furnace
US-10713595-B2 · Jul 14, 2020 · US
Combined system for producing steel and method for operating the combined system
US-10697031-B2 · Jun 30, 2020 · US
Plant combination for producing steel and method for operating the plant combination
US-10697030-B2 · Jun 30, 2020 · US
Device for mounting and/or dismantling staves in a shaft furnace
US-2020182546-A1 · Jun 11, 2020 · US
Combined system for producing steel and method for operating the combined system
US-10604816-B2 · Mar 31, 2020 · US
Method for preparation of ammonia gas and CO2 for a urea synthesis process
US-10519102-B2 · Dec 31, 2019 · US
Method for operating blast furnace
US-10487370-B2 · Nov 26, 2019 · US
Method for operating blast furnace
US-10400292-B2 · Sep 3, 2019 · US
Automated control of circumferential variability of blast furnace
US-2019095812-A1 · Mar 28, 2019 · US
Automated control of circumferential variability of blast furnace
US-2019095816-A1 · Mar 28, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21B7/00?
- CPC C21B7/00 is the Cooperative Patent Classification code for “Blast furnaces.”
- How many patents are filed under CPC C21B7/00 (Blast furnaces)?
- Our database includes 48 publications tagged with this CPC code.
- Is patent activity under CPC C21B7/00 growing?
- Publication counts under this code: 2 in 2024 vs 1 in 2025 (latest complete years).