- 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 1/28 - Normalising
Patent holdings for IPC class C21D 1/28
Total number of patents in this class: 200
10-year publication summary
|
11
|
26
|
11
|
10
|
13
|
27
|
16
|
17
|
8
|
11
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7508 |
13 |
| ArcelorMittal | 2663 |
10 |
| Baoshan Iron & Steel Co., Ltd. | 1101 |
9 |
| POSCO | 2147 |
9 |
| NTN Corporation | 4915 |
7 |
| Nippon Steel Corporation | 6843 |
6 |
| POSCO Co., Ltd. | 2006 |
6 |
| Shandong Iron and Steel Company Ltd | 35 |
5 |
| Jiangyin Xingcheng Special Steel Works Co., Ltd. | 64 |
4 |
| ThyssenKrupp Steel Europe AG | 989 |
4 |
| CRRC Qishuyan Institute Co., Ltd. | 57 |
4 |
| China First Heavy Industries | 12 |
4 |
| Tianjin Heavy Equipment Engineering Research Co., Ltd. | 6 |
4 |
| Robert Bosch GmbH | 44128 |
3 |
| Central Iron & Steel Research Institute | 15 |
3 |
| Salzgitter Flachstahl GmbH | 163 |
3 |
| Terrapower, LLC | 359 |
3 |
| V & M do Brasil S/A | 4 |
3 |
| Nanjing Iron&Steel Co.,Ltd. | 186 |
3 |
| Jiangsu Shagang Group Co., Ltd. | 112 |
3 |
| Other owners | 94 |