- 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 1/28 - Normalising
Patent holdings for IPC class C21D 1/28
Total number of patents in this class: 183
10-year publication summary
|
9
|
11
|
26
|
11
|
10
|
13
|
27
|
15
|
16
|
5
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6816 |
13 |
| ArcelorMittal | 2272 |
9 |
| POSCO | 2186 |
9 |
| NTN Corporation | 4983 |
7 |
| Baoshan Iron & Steel Co., Ltd. | 959 |
7 |
| Nippon Steel Corporation | 6207 |
6 |
| POSCO Co., Ltd. | 1559 |
6 |
| Shandong Iron and Steel Company Ltd | 33 |
5 |
| ThyssenKrupp Steel Europe AG | 954 |
4 |
| CRRC Qishuyan Institute Co., Ltd. | 55 |
4 |
| Central Iron & Steel Research Institute | 15 |
3 |
| Jiangyin Xingcheng Special Steel Works Co., Ltd. | 61 |
3 |
| Terrapower, LLC | 331 |
3 |
| V & M do Brasil S/A | 5 |
3 |
| Nanjing Iron&Steel Co.,Ltd. | 163 |
3 |
| Jiangsu Shagang Group Co., Ltd. | 90 |
3 |
| Shanghai Electric Power Generation Equipment Co., Ltd. | 8 |
3 |
| Laiwu Steel Yinshan Section Co., Ltd. | 21 |
3 |
| Robert Bosch GmbH | 42632 |
2 |
| Shin-Etsu Chemical Co., Ltd. | 5634 |
2 |
| Other owners | 85 |