- All sections
- C - Chemistrymetallurgy
- C21C - Processing of pig-iron, e.g. refining, manufacture of wrought-iron or steeltreatment in molten state of ferrous alloys
- C21C 7/00 - Treating molten ferrous alloys, e.g. steel, not covered by groups
Patent holdings for IPC class C21C 7/00
Total number of patents in this class: 698
10-year publication summary
|
28
|
38
|
31
|
25
|
34
|
50
|
50
|
75
|
85
|
16
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7179 |
75 |
| Nippon Steel Corporation | 6595 |
43 |
| ArcelorMittal | 2461 |
38 |
| Nippon Steel & Sumitomo Metal Corporation | 1985 |
18 |
| Nanjing Iron&Steel Co.,Ltd. | 176 |
18 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2862 |
14 |
| Affival | 28 |
13 |
| Nippon Yakin Kogyo Co., Ltd. | 68 |
12 |
| POSCO | 2154 |
12 |
| SunCoke Technology and Development LLC | 243 |
12 |
| Jiangsu Shagang Group Co., Ltd. | 105 |
11 |
| Shandong Iron and Steel Company Ltd | 34 |
10 |
| University of Science and Technology Beijing | 296 |
9 |
| Laiwu Steel Yinshan Section Co., Ltd. | 23 |
9 |
| Foseco International Limited | 213 |
8 |
| Institute of Research of Iron and Steel, Jiangsu Province/sha-steel, Co. Ltd | 73 |
8 |
| Hitachi Metals, Ltd. | 1937 |
7 |
| Baoshan Iron & Steel Co., Ltd. | 1046 |
7 |
| Institute of Metal Research Chinese Academy of Sciences | 121 |
7 |
| Nucor Corporation | 420 |
7 |
| Other owners | 360 |