- 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 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals
Patent holdings for IPC class C21D 9/46
Total number of patents in this class: 6938
10-year publication summary
|
442
|
514
|
543
|
582
|
439
|
657
|
614
|
673
|
674
|
404
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7527 |
1836 |
| Nippon Steel Corporation | 6871 |
1387 |
| ArcelorMittal | 2672 |
712 |
| POSCO Co., Ltd. | 2012 |
614 |
| POSCO | 2143 |
292 |
| Nippon Steel & Sumitomo Metal Corporation | 1981 |
251 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2836 |
140 |
| ThyssenKrupp Steel Europe AG | 990 |
111 |
| Hyundai Steel Company | 531 |
108 |
| NIPPON STEEL Stainless Steel Corporation | 277 |
108 |
| Baoshan Iron & Steel Co., Ltd. | 1102 |
106 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 157 |
63 |
| Voestalpine Stahl GmbH | 388 |
57 |
| Tata Steel Ijmuiden B.V. | 326 |
46 |
| Nisshin Steel Co., Ltd. | 382 |
43 |
| Salzgitter Flachstahl GmbH | 163 |
42 |
| ArcelorMittal Investigacion y Desarrollo SL | 207 |
33 |
| ThyssenKrupp AG | 3409 |
33 |
| Hitachi Metals, Ltd. | 1898 |
32 |
| Nippon Steel Chemical & Material Co., Ltd. | 730 |
31 |
| Other owners | 893 |