- 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: 188
10-year publication summary
|
8
|
10
|
13
|
10
|
10
|
9
|
19
|
14
|
16
|
22
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7097 |
41 |
| Nippon Steel & Sumitomo Metal Corporation | 1986 |
20 |
| Nippon Steel Corporation | 6540 |
16 |
| ArcelorMittal | 2414 |
11 |
| Baoshan Iron & Steel Co., Ltd. | 1004 |
7 |
| Nanjing Iron&Steel Co.,Ltd. | 174 |
6 |
| Primetals Technologies Austria GmbH | 553 |
5 |
| SMS Siemag Aktiengesellschaft | 500 |
5 |
| ThyssenKrupp AG | 3361 |
5 |
| ThyssenKrupp Steel Europe AG | 963 |
5 |
| Nisshin Steel Co., Ltd. | 394 |
4 |
| Shandong Iron and Steel Company Ltd | 34 |
3 |
| Jiangsu Shagang Group Co., Ltd. | 98 |
3 |
| Laiwu Steel Yinshan Section Co., Ltd. | 22 |
3 |
| Astec Irie Co., Ltd. | 7 |
2 |
| Northeastern University | 550 |
2 |
| POSCO | 2167 |
2 |
| Technological Resources Pty. Limited | 450 |
2 |
| Tokushima University | 231 |
2 |
| Institute of Research of Iron and Steel, Jiangsu Province/sha-steel, Co. Ltd | 70 |
2 |
| Other owners | 42 |