- All sections
- C - Chemistry; metallurgy
- C21D - Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making metal malleable, e.g. by decarburisation or tempering
- C21D 3/08 - Extraction of nitrogen
Patent holdings for IPC class C21D 3/08
Total number of patents in this class: 16
10-year publication summary
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1
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1
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3
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1
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2
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1
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3
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1
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2
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0
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Denso Corporation | 23769 |
5 |
| Hitachi, Ltd. | 15226 |
4 |
| POSCO | 2204 |
2 |
| General Electric Company | 17789 |
1 |
| Aktiebolaget SKF | 2839 |
1 |
| JFE Steel Corporation | 6557 |
1 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2906 |
1 |
| The Swatch Group Research and Development Ltd | 813 |
1 |
| Other owners | 0 |