- All sections
- C - Chemistrymetallurgy
- C21C - Processing of pig-iron, e.g. refining, manufacture of wrought-iron or steeltreatment in molten state of ferrous alloys
- C21C 1/04 - Removing impurities other than carbon, phosphorus, or sulfur
Patent holdings for IPC class C21C 1/04
Total number of patents in this class: 60
10-year publication summary
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3
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2
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4
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5
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2
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2
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1
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1
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6
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1
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6580 |
17 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
7 |
| The Governing Council of The University of Toronto, | 1429 |
2 |
| Kinoshita Manufactory Co., Ltd. | 2 |
2 |
| Midrex Technologies, Inc. | 103 |
2 |
| Naniwa ROKI Co., Ltd. | 7 |
2 |
| Tenova Goodfellow Inc. | 43 |
2 |
| Hitachi Metals, Ltd. | 2020 |
1 |
| Alpha Metals, Inc. | 19 |
1 |
| Boliden Mineral AB | 7 |
1 |
| Danieli & C. Officine Meccaniche S.p.A. | 705 |
1 |
| Diamond Engineering Co., Ltd. | 13 |
1 |
| Heraeus Electro-Nite International N.V. | 205 |
1 |
| Hyundai Steel Company | 353 |
1 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2907 |
1 |
| Kimura Chuzosho Co., Ltd. | 8 |
1 |
| MIE Prefecture | 3 |
1 |
| Nippon Steel Corporation | 6018 |
1 |
| North China University of Science and Technology | 92 |
1 |
| Northeastern University | 522 |
1 |
| Other owners | 13 |