- All sections
- C - Chemistrymetallurgy
- C21B - Manufacture of iron or steel
- C21B 13/10 - Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
Patent holdings for IPC class C21B 13/10
Total number of patents in this class: 148
10-year publication summary
|
15
|
6
|
7
|
1
|
7
|
6
|
2
|
4
|
4
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2877 |
52 |
| Kobe Steel, Ltd. | 870 |
11 |
| Nu-Iron Technology, LLC | 33 |
11 |
| Technological Resources Pty. Limited | 452 |
11 |
| GreenIron H2 AB | 32 |
8 |
| Nippon Steel Corporation | 6203 |
7 |
| Sumitomo Metal Mining Co., Ltd. | 1766 |
5 |
| Midrex Technologies, Inc. | 109 |
3 |
| Tata Steel Limited | 175 |
3 |
| Tata Steel Limited | 17 |
3 |
| E. I. du Pont de Nemours and Company | 4096 |
2 |
| The Chemours Company Fc, LLC | 1213 |
2 |
| JFE Steel Corporation | 6809 |
2 |
| Nippon Steel Engineering Co., Ltd. | 205 |
2 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
2 |
| Primetals Technologies Japan, Ltd. | 162 |
2 |
| Shandong University | 1029 |
2 |
| Tata Steel Nederland Technology BV | 151 |
2 |
| Continuum Powders Corporation | 28 |
2 |
| Siemens VAI Metals Technologies GmbH | 222 |
1 |
| Other owners | 15 |