- 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: 1033
10-year publication summary
|
47
|
46
|
41
|
34
|
43
|
62
|
120
|
129
|
143
|
95
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2292 |
72 |
| POSCO | 2186 |
57 |
| Primetals Technologies Austria GmbH | 535 |
53 |
| Siemens VAI Metals Technologies GmbH | 222 |
45 |
| Midrex Technologies, Inc. | 109 |
45 |
| Hybrit Development AB | 60 |
40 |
| Technological Resources Pty. Limited | 453 |
35 |
| Carbon Technology Holdings, LLC | 215 |
35 |
| JFE Steel Corporation | 6853 |
34 |
| Danieli & C. Officine Meccaniche S.p.A. | 717 |
28 |
| HYL Technologies, S.A. de C.V. | 43 |
26 |
| Paul Wurth S.A. | 420 |
22 |
| ThyssenKrupp Steel Europe AG | 956 |
22 |
| Luossavaara-Kiirunavaara AB | 115 |
19 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2871 |
18 |
| Tata Steel Nederland Technology BV | 151 |
15 |
| Nippon Steel Corporation | 6271 |
14 |
| Tata Steel Limited | 174 |
14 |
| Northeastern University | 539 |
13 |
| Nucor Corporation | 413 |
11 |
| Other owners | 415 |