- 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 5/52 - Manufacture of steel in electric furnaces
Patent holdings for IPC class C21C 5/52
Total number of patents in this class: 791
10-year publication summary
|
31
|
31
|
32
|
33
|
47
|
43
|
49
|
85
|
90
|
20
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2490 |
41 |
| Carbon Technology Holdings, LLC | 226 |
40 |
| Danieli & C. Officine Meccaniche S.p.A. | 710 |
34 |
| JFE Steel Corporation | 7235 |
28 |
| Nippon Steel Corporation | 6651 |
24 |
| SMS Group GmbH | 1152 |
24 |
| Tenova S.p.A. | 154 |
24 |
| Siemens AG | 24329 |
23 |
| Primetals Technologies Austria GmbH | 563 |
19 |
| SMS Siemag Aktiengesellschaft | 493 |
18 |
| Hyundai Steel Company | 476 |
13 |
| Cisdi Engineering Co., Ltd. | 100 |
12 |
| JP Steel Plantech Co. | 82 |
12 |
| Primetals Technologies Germany GmbH | 213 |
12 |
| SunCoke Technology and Development LLC | 245 |
12 |
| KW Associates LLC | 13 |
9 |
| ABB Schweiz AG | 7353 |
8 |
| Baoshan Iron & Steel Co., Ltd. | 1059 |
8 |
| POSCO Co., Ltd. | 1641 |
8 |
| ThyssenKrupp Steel Europe AG | 976 |
8 |
| Other owners | 414 |