- 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 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Patent holdings for IPC class C21D 9/50
Total number of patents in this class: 574
10-year publication summary
|
53
|
56
|
47
|
61
|
65
|
59
|
49
|
30
|
28
|
7
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6067 |
78 |
| Nippon Steel Corporation | 5649 |
55 |
| ArcelorMittal | 1887 |
39 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
17 |
| Mitsubishi Heavy Industries, Ltd. | 8217 |
16 |
| POSCO Co., Ltd. | 1059 |
10 |
| ArcelorMittal France | 102 |
8 |
| Baoshan Iron & Steel Co., Ltd. | 832 |
8 |
| POSCO | 2222 |
7 |
| Rtx Corporation | 8674 |
7 |
| Siemens AG | 24990 |
6 |
| ArcelorMittal Investigacion y Desarrollo SL | 209 |
4 |
| The Chugoku Electric Power Co., Inc. | 498 |
4 |
| Constellium Issoire | 208 |
4 |
| Dai-Ichi High Frequency Co., Ltd. | 34 |
4 |
| General Electric Technology GmbH | 1657 |
4 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
4 |
| Tenaris Coiled Tubes, LLC | 21 |
4 |
| ThyssenKrupp Steel Europe AG | 924 |
4 |
| NIPPON STEEL Stainless Steel Corporation | 254 |
4 |
| Other owners | 287 |