- 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 5/52 - Manufacture of steel in electric furnaces
Patent holdings for IPC class C21C 5/52
Total number of patents in this class: 675
10-year publication summary
|
37
|
35
|
35
|
35
|
35
|
50
|
53
|
56
|
83
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Carbon Technology Holdings, LLC | 199 |
36 |
| Danieli & C. Officine Meccaniche S.p.A. | 705 |
33 |
| Siemens AG | 24573 |
26 |
| Tenova S.p.A. | 154 |
26 |
| JFE Steel Corporation | 6549 |
24 |
| SMS Group GmbH | 1079 |
22 |
| ArcelorMittal | 2060 |
18 |
| SMS Siemag Aktiengesellschaft | 515 |
18 |
| Primetals Technologies Austria GmbH | 511 |
16 |
| Nippon Steel Corporation | 6000 |
15 |
| JP Steel Plantech Co. | 81 |
12 |
| Primetals Technologies Germany GmbH | 194 |
12 |
| Cisdi Engineering Co., Ltd. | 93 |
11 |
| Hyundai Steel Company | 350 |
11 |
| KW Associates LLC | 13 |
9 |
| ABB Schweiz AG | 6624 |
8 |
| ThyssenKrupp Steel Europe AG | 956 |
8 |
| Amerifab, Inc. | 49 |
6 |
| Baoshan Iron & Steel Co., Ltd. | 892 |
6 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 3591 |
6 |
| Other owners | 352 |