- All sections
- C - Chemistrymetallurgy
- C21B - Manufacture of iron or steel
- C21B 13/00 - Making spongy iron or liquid steel, by direct processes
Patent holdings for IPC class C21B 13/00
Total number of patents in this class: 997
10-year publication summary
|
47
|
46
|
41
|
34
|
44
|
61
|
121
|
129
|
142
|
59
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2197 |
63 |
| POSCO | 2188 |
57 |
| Primetals Technologies Austria GmbH | 524 |
52 |
| Siemens VAI Metals Technologies GmbH | 223 |
45 |
| Midrex Technologies, Inc. | 107 |
43 |
| Hybrit Development AB | 56 |
39 |
| Technological Resources Pty. Limited | 443 |
35 |
| Carbon Technology Holdings, LLC | 207 |
31 |
| JFE Steel Corporation | 6730 |
30 |
| Danieli & C. Officine Meccaniche S.p.A. | 705 |
27 |
| HYL Technologies, S.A. de C.V. | 43 |
26 |
| Paul Wurth S.A. | 413 |
22 |
| ThyssenKrupp Steel Europe AG | 950 |
21 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2866 |
18 |
| Luossavaara-Kiirunavaara AB | 109 |
17 |
| Tata Steel Nederland Technology BV | 151 |
15 |
| Tata Steel Limited | 175 |
14 |
| Nippon Steel Corporation | 6139 |
13 |
| Northeastern University | 536 |
13 |
| Nucor Corporation | 414 |
11 |
| Other owners | 405 |