Blast furnace operation method
US-12378615-B2 · Aug 5, 2025 · US
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Opening or sealing the tap holes
Opening or sealing the tap holes · 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 | C21B7/12 |
| Official title | Opening or sealing the tap holes |
| Display label | Opening or sealing the tap holes |
| Total patents | 13 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2017 | 2 |
| 2018 | 1 |
| 2019 | 3 |
| 2020 | 1 |
| 2022 | 2 |
| 2023 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method of heating up furnace bottom, and burner lance used in the method
US-12259184-B2 · Mar 25, 2025 · US
Hole-opening bit and tap hole opening method using same
US-11821048-B2 · Nov 21, 2023 · US
Blast furnace operation method
US-2023175085-A1 · Jun 8, 2023 · 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 repairing a refractory shell of a metallurgical vessel
US-10857593-B2 · Dec 8, 2020 · US
Device for inserting a refractory block into a taphole structure of a metallurgical vessel, in particular a basic oxygen furnace
US-10400294-B2 · Sep 3, 2019 · US
Smelting process and apparatus
US-2019136333-A1 · May 9, 2019 · US
Drill bit, tap hole drilling machine equipped with said drill bit, and process for making said drill bit
US-2019024978-A1 · Jan 24, 2019 · US
Method and Device for Repairing a Refractory Shell of a Metallurgical Vessel
US-2018029117-A1 · Feb 1, 2018 · US
Method of Sealing and Repairing a Refractory Tap Hole
US-2017342513-A1 · Nov 30, 2017 · US
Device for Inserting a Refractory Block Into a Taphole Structure of a Metallurgical Vessel, in Particular a Basic Oxygen Furnace, and a Method for an Automatic Supply of the Refractory
US-2017327913-A1 · Nov 16, 2017 · US