- All sections
- C - Chemistrymetallurgy
- C21D - Modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or non-ferrous metals or alloysmaking metal malleable, e.g. by decarburisation or tempering
- C21D 3/04 - Decarburising
Patent holdings for IPC class C21D 3/04
Total number of patents in this class: 168
10-year publication summary
|
8
|
12
|
15
|
8
|
12
|
28
|
18
|
23
|
14
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6754 |
57 |
| JFE Steel Corporation | 7418 |
25 |
| POSCO Co., Ltd. | 1703 |
16 |
| POSCO | 2152 |
10 |
| Baoshan Iron & Steel Co., Ltd. | 1092 |
9 |
| ArcelorMittal | 2608 |
7 |
| ArcelorMittal Investigacion y Desarrollo SL | 208 |
4 |
| Shougang Zhixin Electromagnetic Materials (qian'an) Co., Ltd. | 6 |
3 |
| Hyundai Steel Company | 509 |
2 |
| Kobe Steel, Ltd. | 896 |
2 |
| Messier-Bugatti-Dowty | 226 |
2 |
| Nippon Steel & Sumitomo Metal Corporation | 1981 |
2 |
| Salzgitter Flachstahl GmbH | 163 |
2 |
| SMS Group GmbH | 1182 |
2 |
| Tateho Chemical Industries Co., Ltd. | 59 |
2 |
| ThyssenKrupp Steel Europe AG | 988 |
2 |
| GM Global Technology Operations LLC | 15958 |
1 |
| Nissan Motor Co., Ltd. | 12866 |
1 |
| Hyundai Motor Company | 24195 |
1 |
| Kia Motors Corporation | 7719 |
1 |
| Other owners | 17 |