- 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 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for welded joints
Patent holdings for IPC class C21D 9/50
Total number of patents in this class: 605
10-year publication summary
|
54
|
45
|
54
|
60
|
50
|
47
|
29
|
27
|
23
|
21
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6860 |
83 |
| Nippon Steel Corporation | 6286 |
65 |
| ArcelorMittal | 2300 |
46 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
17 |
| Mitsubishi Heavy Industries, Ltd. | 8764 |
14 |
| POSCO Co., Ltd. | 1569 |
13 |
| ArcelorMittal France | 94 |
8 |
| Baoshan Iron & Steel Co., Ltd. | 964 |
8 |
| Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. | 71 |
8 |
| POSCO | 2184 |
7 |
| Rtx Corporation | 9419 |
7 |
| Siemens AG | 24437 |
6 |
| National Oilwell Varco, L.P. | 1683 |
6 |
| ArcelorMittal Investigacion y Desarrollo SL | 209 |
4 |
| The Chugoku Electric Power Co., Inc. | 513 |
4 |
| Constellium Issoire | 219 |
4 |
| Dai-Ichi High Frequency Co., Ltd. | 35 |
4 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2870 |
4 |
| Tenaris Coiled Tubes, LLC | 22 |
4 |
| ThyssenKrupp Steel Europe AG | 956 |
4 |
| Other owners | 289 |