- 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 5/28 - Manufacture of steel in the converter
Patent holdings for IPC class C21C 5/28
Total number of patents in this class: 177
10-year publication summary
|
9
|
11
|
15
|
10
|
10
|
9
|
20
|
18
|
17
|
12
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6684 |
37 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
20 |
| Nippon Steel Corporation | 6097 |
15 |
| ArcelorMittal | 2134 |
8 |
| Baoshan Iron & Steel Co., Ltd. | 939 |
6 |
| Nanjing Iron&Steel Co.,Ltd. | 159 |
6 |
| SMS Siemag Aktiengesellschaft | 507 |
5 |
| ThyssenKrupp AG | 3239 |
5 |
| ThyssenKrupp Steel Europe AG | 953 |
5 |
| Nisshin Steel Co., Ltd. | 398 |
4 |
| Primetals Technologies Austria GmbH | 522 |
4 |
| Shandong Iron and Steel Company Ltd | 33 |
3 |
| Jiangsu Shagang Group Co., Ltd. | 80 |
3 |
| Laiwu Steel Yinshan Section Co., Ltd. | 21 |
3 |
| Astec Irie Co., Ltd. | 7 |
2 |
| Northeastern University | 534 |
2 |
| POSCO | 2191 |
2 |
| Technological Resources Pty. Limited | 442 |
2 |
| Tokushima University | 205 |
2 |
| Institute of Research of Iron and Steel, Jiangsu Province/sha-steel, Co. Ltd | 55 |
2 |
| Other owners | 41 |