A method for manufacturing pig iron in an electrical smelting furnace and associated electrical smelting furnace
US-2026043100-A1 · Feb 12, 2026 · US
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Tapholes; Opening or plugging thereof
Tapholes; Opening or plugging thereof · 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 | C21C5/4653 |
| Official title | {Tapholes; Opening or plugging thereof} |
| Display label | Tapholes; Opening or plugging thereof |
| Total patents | 19 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 1 |
| 2019 | 1 |
| 2021 | 2 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 1 |
| 2025 | 2 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
A method for manufacturing pig iron in an electrical smelting furnace and associated electrical smelting furnace
US-2026028687-A1 · Jan 29, 2026 · US
Method for manufacturing pig iron into an electrical smelting furnace and associated smelting furnace
US-2026022428-A1 · Jan 22, 2026 · US
A method for manufacturing pig iron in an electrical smelting furnace and associated electrical smelting furnace
US-2026022429-A1 · Jan 22, 2026 · US
A method for manufacturing pig iron in an electrical smelting furnace and associated smelting furnace
US-2026015682-A1 · Jan 15, 2026 · US
A method for manufacturing pig iron in an electrical smelting furnace and associated electrical smelting furnace
US-2025388985-A1 · Dec 25, 2025 · US
Method of heating up furnace bottom, and burner lance used in the method
US-12259184-B2 · Mar 25, 2025 · US
Sliding closure for a metallurgical vessel
US-11969785-B2 · Apr 30, 2024 · US
Hole-opening bit and tap hole opening method using same
US-11821048-B2 · Nov 21, 2023 · US
Sliding closure for a metallurgical vessel
US-2023042291-A1 · Feb 9, 2023 · US
Melting furnace for metallurgical plant and operating method therefor
US-11390927-B2 · Jul 19, 2022 · US
Method of heating up furnace bottom, and burner lance used in the method
US-2022178612-A1 · Jun 9, 2022 · US
Hole-opening bit and tap hole opening method using same
US-2022162717-A1 · May 26, 2022 · US
Method and device for detecting variables in the outlet of a metallurgical vessel
US-11141779-B2 · Oct 12, 2021 · US
Melting furnace for metallurgical plant and operating method therefor
US-2021079489-A1 · Mar 18, 2021 · US
Method and device for detecting variables in the outlet of a metallurgical vessel
US-2019375001-A1 · Dec 12, 2019 · US
Tap on a metallurgical vessel, in particular on an electric arc furnace
US-2017261263-A1 · Sep 14, 2017 · US
Method and arrangement for vortex reduction in a metal making process
US-9360255-B2 · Jun 7, 2016 · US
Method for opening and closing a tapping opening of a metallurgical smelting vessel and metallurgical smelting vessel
US-9200846-B2 · Dec 1, 2015 · US