- All sections
- C - Chemistry; metallurgy
- C21C - Processing of pig-iron, e.g. refining, manufacture of wrought-iron or steel; treatment 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: 540
10-year publication summary
35
|
38
|
29
|
41
|
34
|
26
|
36
|
60
|
51
|
24
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
JFE Steel Corporation | 6067 |
56 |
Nippon Steel Corporation | 5649 |
39 |
Nippon Steel & Sumitomo Metal Corporation | 1990 |
18 |
ArcelorMittal | 1887 |
16 |
Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
16 |
Affival | 28 |
13 |
POSCO | 2222 |
12 |
Nanjing Iron&Steel Co.,Ltd. | 135 |
11 |
Nippon Yakin Kogyo Co., Ltd. | 51 |
10 |
Hitachi Metals, Ltd. | 2175 |
7 |
Baoshan Iron & Steel Co., Ltd. | 832 |
7 |
Foseco International Limited | 204 |
7 |
NIPPON STEEL Stainless Steel Corporation | 254 |
7 |
Pyrotek, Inc. | 193 |
6 |
University of Science and Technology Beijing | 245 |
6 |
Institute of Metal Research Chinese Academy of Sciences | 104 |
5 |
Nisshin Steel Co., Ltd. | 401 |
5 |
Nucor Corporation | 425 |
5 |
Specialty Minerals (Michigan) Inc. | 209 |
5 |
Danieli & C. Officine Meccaniche S.p.A. | 680 |
4 |
Other owners | 285 |