- 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: 337
10-year publication summary
|
17
|
9
|
11
|
8
|
10
|
17
|
25
|
32
|
46
|
37
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Midrex Technologies, Inc. | 111 |
58 |
| Hybrit Development AB | 61 |
32 |
| JFE Steel Corporation | 6916 |
21 |
| Danieli & C. Officine Meccaniche S.p.A. | 718 |
17 |
| HYL Technologies, S.A. de C.V. | 43 |
17 |
| ArcelorMittal | 2319 |
16 |
| Nippon Steel Corporation | 6334 |
16 |
| Primetals Technologies Austria GmbH | 539 |
16 |
| ThyssenKrupp Steel Europe AG | 959 |
11 |
| Siemens VAI Metals Technologies GmbH | 221 |
7 |
| Paul Wurth S.A. | 418 |
7 |
| Luossavaara-Kiirunavaara AB | 116 |
6 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2877 |
5 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 3994 |
5 |
| POSCO | 2183 |
5 |
| Baoshan Iron & Steel Co., Ltd. | 966 |
4 |
| POSCO Co., Ltd. | 1571 |
4 |
| Tecnored Desenvolvimento Tecnologico S.A. | 34 |
4 |
| Saudi Basic Industries Corporation | 552 |
3 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
3 |
| Other owners | 80 |