- All sections
- C - Chemistry; metallurgy
- C21C - Processing of pig-iron, e.g. refining, manufacture of wrought-iron or steel; treatment 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: 144
10-year publication summary
4
|
9
|
11
|
15
|
10
|
10
|
9
|
20
|
16
|
4
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
JFE Steel Corporation | 6067 |
31 |
Nippon Steel & Sumitomo Metal Corporation | 1990 |
20 |
Nippon Steel Corporation | 5649 |
12 |
Baoshan Iron & Steel Co., Ltd. | 832 |
6 |
ArcelorMittal | 1887 |
5 |
SMS Siemag Aktiengesellschaft | 529 |
5 |
ThyssenKrupp AG | 3086 |
5 |
Nisshin Steel Co., Ltd. | 401 |
4 |
Primetals Technologies Austria GmbH | 479 |
3 |
ThyssenKrupp Steel Europe AG | 924 |
3 |
Nanjing Iron&Steel Co.,Ltd. | 135 |
3 |
Astec Irie Co., Ltd. | 6 |
2 |
Northeastern University | 493 |
2 |
POSCO | 2222 |
2 |
Tata Steel Limited | 184 |
2 |
Technological Resources Pty. Limited | 444 |
2 |
Jiangsu Shagang Group Co., Ltd. | 52 |
2 |
Institute of Research of Iron and Steel, Jiangsu Province/sha-steel, Co. Ltd | 32 |
2 |
Siemens VAI Metals Technologies GmbH | 233 |
1 |
JTEKT Corporation | 2423 |
1 |
Other owners | 31 |