- All sections
- C - Chemistrymetallurgy
- C21B - Manufacture of iron or steel
- C21B 13/02 - Making spongy iron or liquid steel, by direct processes in shaft furnaces
Patent holdings for IPC class C21B 13/02
Total number of patents in this class: 408
10-year publication summary
|
9
|
12
|
11
|
10
|
24
|
36
|
41
|
53
|
71
|
36
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Midrex Technologies, Inc. | 122 |
65 |
| Hybrit Development AB | 74 |
43 |
| Nippon Steel Corporation | 6932 |
33 |
| JFE Steel Corporation | 7589 |
32 |
| ArcelorMittal | 2714 |
25 |
| HYL Technologies, S.A. de C.V. | 46 |
19 |
| Danieli & C. Officine Meccaniche S.p.A. | 719 |
18 |
| Primetals Technologies Austria GmbH | 577 |
18 |
| ThyssenKrupp Steel Europe AG | 995 |
12 |
| Paul Wurth S.A. | 429 |
8 |
| Siemens VAI Metals Technologies GmbH | 204 |
7 |
| Luossavaara-Kiirunavaara AB | 129 |
7 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2836 |
5 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 4122 |
5 |
| POSCO | 2141 |
5 |
| Tecnored Desenvolvimento Tecnologico S.A. | 43 |
5 |
| Baoshan Iron & Steel Co., Ltd. | 1114 |
4 |
| POSCO Co., Ltd. | 2021 |
4 |
| Form Energy, Inc. | 240 |
4 |
| Calix Ltd | 88 |
3 |
| Other owners | 86 |