- 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: 6304
10-year publication summary
|
460
|
442
|
513
|
542
|
582
|
438
|
657
|
609
|
660
|
401
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6833 |
1691 |
| Nippon Steel Corporation | 6231 |
1207 |
| ArcelorMittal | 2280 |
581 |
| POSCO Co., Ltd. | 1564 |
518 |
| POSCO | 2187 |
290 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
251 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2875 |
144 |
| NIPPON STEEL Stainless Steel Corporation | 287 |
106 |
| ThyssenKrupp Steel Europe AG | 954 |
104 |
| Hyundai Steel Company | 426 |
96 |
| Baoshan Iron & Steel Co., Ltd. | 962 |
95 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 168 |
65 |
| Voestalpine Stahl GmbH | 355 |
53 |
| Nisshin Steel Co., Ltd. | 394 |
43 |
| Tata Steel Ijmuiden B.V. | 308 |
40 |
| Salzgitter Flachstahl GmbH | 159 |
39 |
| ThyssenKrupp AG | 3281 |
37 |
| ArcelorMittal Investigacion y Desarrollo SL | 209 |
33 |
| Hitachi Metals, Ltd. | 1982 |
32 |
| Kobe Steel, Ltd. | 872 |
26 |
| Other owners | 853 |