- All sections
- C - Chemistry; metallurgy
- 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: 838
10-year publication summary
|
48
|
47
|
46
|
41
|
34
|
43
|
58
|
116
|
110
|
42
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| POSCO | 2222 |
61 |
| Siemens VAI Metals Technologies GmbH | 233 |
47 |
| ArcelorMittal | 1887 |
47 |
| Primetals Technologies Austria GmbH | 479 |
46 |
| Midrex Technologies, Inc. | 103 |
38 |
| Technological Resources Pty. Limited | 444 |
36 |
| Danieli & C. Officine Meccaniche S.p.A. | 680 |
26 |
| HYL Technologies, S.A. de C.V. | 41 |
25 |
| Hybrit Development AB | 38 |
24 |
| Carbon Technology Holdings, LLC | 185 |
22 |
| Tata Steel Limited | 184 |
20 |
| JFE Steel Corporation | 6067 |
18 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
18 |
| Paul Wurth S.A. | 392 |
18 |
| Nu-Iron Technology, LLC | 44 |
15 |
| ThyssenKrupp Steel Europe AG | 924 |
14 |
| Luossavaara-Kiirunavaara AB | 78 |
12 |
| Northeastern University | 493 |
12 |
| Tata Steel Nederland Technology BV | 143 |
11 |
| Kobe Steel, Ltd. | 912 |
8 |
| Other owners | 320 |