- All sections
- C - Chemistrymetallurgy
- C21D - Modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or non-ferrous metals or alloysmaking metal malleable, e.g. by decarburisation or tempering
- C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
Patent holdings for IPC class C21D 8/12
Total number of patents in this class: 2133
10-year publication summary
|
126
|
112
|
137
|
152
|
182
|
153
|
227
|
191
|
236
|
200
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6840 |
648 |
| Nippon Steel Corporation | 6238 |
466 |
| POSCO Co., Ltd. | 1568 |
193 |
| POSCO | 2186 |
174 |
| Baoshan Iron & Steel Co., Ltd. | 964 |
92 |
| ArcelorMittal | 2285 |
58 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
53 |
| Hyundai Steel Company | 427 |
36 |
| ThyssenKrupp Electrical Steel GmbH | 29 |
19 |
| ThyssenKrupp Steel Europe AG | 955 |
19 |
| Proterial, Ltd. | 846 |
18 |
| Vacuumschmelze GmbH & Co. KG | 261 |
16 |
| ThyssenKrupp AG | 3283 |
15 |
| Aperam | 118 |
14 |
| SMS Group GmbH | 1125 |
11 |
| Jiangsu Shagang Group Co., Ltd. | 90 |
11 |
| Tateho Chemical Industries Co., Ltd. | 60 |
10 |
| Centro Sviluppo Materiali S.p.A. | 27 |
9 |
| Zhangjiagang Yangtze River Cold Rolled Plate Co. Ltd | 18 |
9 |
| Hitachi Metals, Ltd. | 1982 |
8 |
| Other owners | 254 |