- 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: 188
10-year publication summary
|
16
|
14
|
17
|
18
|
12
|
15
|
21
|
31
|
10
|
11
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2714 |
79 |
| JFE Steel Corporation | 7589 |
13 |
| Nippon Steel Corporation | 6932 |
8 |
| Voestalpine Stahl GmbH | 390 |
5 |
| AK Steel Properties, Inc. | 74 |
4 |
| Tenaris Coiled Tubes, LLC | 23 |
4 |
| United States Steel Corporation | 173 |
4 |
| POSCO Co., Ltd. | 2021 |
3 |
| Tata Steel Nederland Technology BV | 163 |
3 |
| ThyssenKrupp Steel Europe AG | 995 |
3 |
| Toyota Motor Corporation | 35927 |
2 |
| Aktiebolaget SKF | 3142 |
2 |
| ArvinMeritor Technology, LLC | 422 |
2 |
| C.D. Wälzholz GmbH | 38 |
2 |
| Compania Electro Metalurgica S.A. | 37 |
2 |
| Cummins Inc. | 2641 |
2 |
| PARKER NETSUSHORI KOGYO Co., Ltd. | 36 |
2 |
| SSAB Technology AB | 163 |
2 |
| UT-Battelle, LLC | 1516 |
2 |
| FLSmidth A/S | 788 |
2 |
| Other owners | 42 |