- 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 1/22 - Martempering
Patent holdings for IPC class C21D 1/22
Total number of patents in this class: 163
10-year publication summary
|
8
|
15
|
12
|
15
|
16
|
11
|
11
|
14
|
23
|
4
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2293 |
65 |
| JFE Steel Corporation | 6849 |
11 |
| Nippon Steel Corporation | 6274 |
8 |
| Voestalpine Stahl GmbH | 356 |
5 |
| AK Steel Properties, Inc. | 75 |
4 |
| Tenaris Coiled Tubes, LLC | 22 |
4 |
| United States Steel Corporation | 174 |
4 |
| Tata Steel Nederland Technology BV | 151 |
3 |
| ThyssenKrupp Steel Europe AG | 956 |
3 |
| Toyota Motor Corporation | 32450 |
2 |
| ArvinMeritor Technology, LLC | 400 |
2 |
| C.D. Wälzholz GmbH | 37 |
2 |
| Compania Electro Metalurgica S.A. | 39 |
2 |
| POSCO Co., Ltd. | 1568 |
2 |
| SSAB Technology AB | 158 |
2 |
| SNECMA S.A. | 1148 |
1 |
| Canon Inc. | 40095 |
1 |
| Hitachi Metals, Ltd. | 1977 |
1 |
| ZF Friedrichshafen AG | 7156 |
1 |
| Schaeffler Technologies AG & Co. KG | 9908 |
1 |
| Other owners | 39 |