- 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 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for strips
Patent holdings for IPC class C21D 9/52
Total number of patents in this class: 723
10-year publication summary
|
77
|
64
|
76
|
80
|
50
|
51
|
55
|
93
|
67
|
21
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 5649 |
55 |
| POSCO Co., Ltd. | 1059 |
38 |
| Baoshan Iron & Steel Co., Ltd. | 832 |
33 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
32 |
| POSCO | 2222 |
28 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
24 |
| NV Bekaert SA | 750 |
20 |
| ArcelorMittal | 1887 |
17 |
| Sumitomo Electric Industries, Ltd. | 14131 |
16 |
| JFE Steel Corporation | 6067 |
16 |
| Nucor Corporation | 425 |
11 |
| ThyssenKrupp Steel Europe AG | 924 |
11 |
| Proterial, Ltd. | 638 |
11 |
| Salzgitter Flachstahl GmbH | 155 |
10 |
| Tata Steel Ijmuiden B.V. | 283 |
10 |
| Voestalpine Stahl GmbH | 311 |
10 |
| ArcelorMittal Wire France | 40 |
9 |
| Nippon Steel SG Wire Co., Ltd. | 13 |
8 |
| Tata Steel Nederland Technology BV | 143 |
6 |
| Compagnie Generale des Etablissements Michelin | 4450 |
6 |
| Other owners | 352 |