- 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: 840
10-year publication summary
|
35
|
35
|
35
|
35
|
50
|
54
|
61
|
98
|
107
|
62
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2663 |
56 |
| Carbon Technology Holdings, LLC | 231 |
41 |
| Danieli & C. Officine Meccaniche S.p.A. | 720 |
34 |
| JFE Steel Corporation | 7508 |
31 |
| Nippon Steel Corporation | 6843 |
26 |
| SMS Group GmbH | 1194 |
24 |
| Tenova S.p.A. | 158 |
24 |
| Siemens AG | 24033 |
23 |
| Primetals Technologies Austria GmbH | 573 |
19 |
| SMS Siemag Aktiengesellschaft | 486 |
18 |
| Hyundai Steel Company | 529 |
15 |
| POSCO Co., Ltd. | 2006 |
14 |
| SunCoke Technology and Development LLC | 245 |
13 |
| Cisdi Engineering Co., Ltd. | 107 |
12 |
| JP Steel Plantech Co. | 81 |
12 |
| Primetals Technologies Germany GmbH | 219 |
12 |
| ThyssenKrupp Steel Europe AG | 989 |
10 |
| SMS Group S.p.A. | 44 |
9 |
| KW Associates LLC | 13 |
9 |
| ABB Schweiz AG | 7590 |
8 |
| Other owners | 430 |