Method for denitrifying molten steel
US-2026035759-A1 · Feb 5, 2026 · US
Removing impurities by adding a treating agent
Removing impurities by adding a treating agent · 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 | C21C7/04 |
| Official title | Removing impurities by adding a treating agent |
| Display label | Removing impurities by adding a treating agent |
| Total patents | 56 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 11 |
| 2017 | 5 |
| 2018 | 5 |
| 2019 | 9 |
| 2020 | 6 |
| 2021 | 3 |
| 2023 | 6 |
| 2024 | 4 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Steel
US-12480190-B2 · Nov 25, 2025 · US
Molten steel denitrification method and steel production method
US-12252754-B2 · Mar 18, 2025 · US
Non-oriented electrical steel sheet and method for manufacturing slab used as material for the same
US-2025034685-A1 · Jan 30, 2025 · US
Non-oriented electrical steel sheet and method for manufacturing slab used as material for the same
US-12146209-B2 · Nov 19, 2024 · US
Steel material
US-2024352566-A1 · Oct 24, 2024 · US
Molten steel denitrification method and steel production method
US-2024247329-A1 · Jul 25, 2024 · US
Converter blowing control method and converter blowing control system
US-2024035104-A1 · Feb 1, 2024 · US
Supersaturated solid solution soft magnetic material and preparation method thereof
US-11791076-B2 · Oct 17, 2023 · US
A method of casting a steel semi-product with high titanium content
US-2023257839-A1 · Aug 17, 2023 · US
Converter blowing control method and converter blowing control system
US-2023243005-A1 · Aug 3, 2023 · US
Supersaturated solid solution soft magnetic material and preparation method thereof
US-2023230734-A1 · Jul 20, 2023 · US
Steel
US-2023118113-A1 · Apr 20, 2023 · US
Ferritic stainless steel
US-2023099909-A1 · Mar 30, 2023 · US
Non-oriented electrical steel sheet and method for manufacturing slab used as material for the same
US-2021332463-A1 · Oct 28, 2021 · US
Non-heat treated steel bar
US-11111569-B2 · Sep 7, 2021 · US
Non-oriented electrical steel sheet and production method thereof
US-11008633-B2 · May 18, 2021 · US
Stainless steel product
US-10822679-B2 · Nov 3, 2020 · US
Method for eluting calcium from steelmaking slag, and method for collecting calcium from steelmaking slag
US-2020318209-A1 · Oct 8, 2020 · US
Method for refining molten steel in vacuum degassing equipment
US-10745771-B2 · Aug 18, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C21C7/04?
- CPC C21C7/04 is the Cooperative Patent Classification code for “Removing impurities by adding a treating agent.”
- How many patents are filed under CPC C21C7/04 (Removing impurities by adding a treating agent)?
- Our database includes 56 publications tagged with this CPC code.
- Is patent activity under CPC C21C7/04 growing?
- Publication counts under this code: 4 in 2024 vs 3 in 2025 (latest complete years).