- 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: 752
10-year publication summary
|
36
|
31
|
31
|
32
|
33
|
47
|
42
|
48
|
84
|
82
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2360 |
40 |
| Carbon Technology Holdings, LLC | 218 |
40 |
| Danieli & C. Officine Meccaniche S.p.A. | 713 |
34 |
| JFE Steel Corporation | 7012 |
27 |
| Tenova S.p.A. | 154 |
25 |
| Siemens AG | 24363 |
23 |
| SMS Group GmbH | 1136 |
23 |
| Nippon Steel Corporation | 6452 |
18 |
| SMS Siemag Aktiengesellschaft | 504 |
18 |
| Primetals Technologies Austria GmbH | 547 |
16 |
| Cisdi Engineering Co., Ltd. | 101 |
12 |
| Hyundai Steel Company | 451 |
12 |
| JP Steel Plantech Co. | 83 |
12 |
| Primetals Technologies Germany GmbH | 207 |
12 |
| KW Associates LLC | 13 |
9 |
| ABB Schweiz AG | 7127 |
8 |
| ThyssenKrupp Steel Europe AG | 962 |
8 |
| Baoshan Iron & Steel Co., Ltd. | 975 |
7 |
| Danieli Automation SpA | 123 |
7 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 3998 |
7 |
| Other owners | 394 |