- 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: 381
10-year publication summary
|
9
|
12
|
11
|
10
|
24
|
36
|
41
|
53
|
61
|
17
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Midrex Technologies, Inc. | 112 |
59 |
| Hybrit Development AB | 71 |
40 |
| Nippon Steel Corporation | 6701 |
28 |
| ArcelorMittal | 2541 |
23 |
| JFE Steel Corporation | 7370 |
23 |
| HYL Technologies, S.A. de C.V. | 44 |
18 |
| Primetals Technologies Austria GmbH | 566 |
18 |
| Danieli & C. Officine Meccaniche S.p.A. | 713 |
17 |
| ThyssenKrupp Steel Europe AG | 984 |
12 |
| Siemens VAI Metals Technologies GmbH | 206 |
7 |
| Luossavaara-Kiirunavaara AB | 128 |
7 |
| Paul Wurth S.A. | 430 |
7 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2832 |
5 |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 4056 |
5 |
| POSCO | 2153 |
5 |
| Tecnored Desenvolvimento Tecnologico S.A. | 39 |
5 |
| Baoshan Iron & Steel Co., Ltd. | 1078 |
4 |
| POSCO Co., Ltd. | 1670 |
4 |
| Saudi Basic Industries Corporation | 528 |
3 |
| Calix Ltd | 92 |
3 |
| Other owners | 88 |