- All sections
- C - Chemistry; metallurgy
- C21D - Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making metal malleable, e.g. by decarburisation or tempering
- C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
Patent holdings for IPC class C21D 9/46
Total number of patents in this class: 5461
10-year publication summary
|
355
|
460
|
442
|
512
|
541
|
580
|
436
|
653
|
586
|
190
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6067 |
1519 |
| Nippon Steel Corporation | 5649 |
987 |
| ArcelorMittal | 1887 |
454 |
| POSCO Co., Ltd. | 1059 |
360 |
| POSCO | 2222 |
291 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
251 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
145 |
| ThyssenKrupp Steel Europe AG | 924 |
93 |
| NIPPON STEEL Stainless Steel Corporation | 254 |
86 |
| Baoshan Iron & Steel Co., Ltd. | 832 |
84 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 171 |
66 |
| Hyundai Steel Company | 310 |
52 |
| Voestalpine Stahl GmbH | 311 |
46 |
| Nisshin Steel Co., Ltd. | 401 |
45 |
| Tata Steel Ijmuiden B.V. | 283 |
39 |
| ThyssenKrupp AG | 3086 |
38 |
| Salzgitter Flachstahl GmbH | 155 |
36 |
| ArcelorMittal Investigacion y Desarrollo SL | 209 |
33 |
| Hitachi Metals, Ltd. | 2175 |
32 |
| Kobe Steel, Ltd. | 912 |
25 |
| Other owners | 779 |