- All sections
- C - Chemistrymetallurgy
- C21B - Manufacture of iron or steel
- C21B 13/08 - Making spongy iron or liquid steel, by direct processes in rotary furnaces
Patent holdings for IPC class C21B 13/08
Total number of patents in this class: 47
10-year publication summary
|
0
|
6
|
0
|
4
|
2
|
1
|
4
|
8
|
4
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Sumitomo Metal Mining Co., Ltd. | 1766 |
4 |
| Eco'ring | 15 |
3 |
| Zhongye Changtian International Engineering Co., Ltd. | 76 |
3 |
| Hoei Shokai Co., Ltd. | 13 |
2 |
| Kobe Steel, Ltd. | 870 |
2 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
2 |
| Tetsugen Corporation | 4 |
2 |
| Tohoku University | 2775 |
2 |
| Coolbrook Oy | 67 |
1 |
| Danieli & C. Officine Meccaniche S.p.A. | 715 |
1 |
| HYL Technologies, S.A. de C.V. | 44 |
1 |
| Iron Mineral Beneficiation Services (Proprietary) Limited | 2 |
1 |
| JFE Steel Corporation | 6809 |
1 |
| Metso Minerals Oy | 107 |
1 |
| Midrex Technologies, Inc. | 109 |
1 |
| Nippon Steel Corporation | 6203 |
1 |
| Nu-Iron Technology, LLC | 33 |
1 |
| Outotec (Finland) Oy | 480 |
1 |
| POSCO | 2188 |
1 |
| Primetals Technologies Austria GmbH | 530 |
1 |
| Other owners | 15 |