- 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 9/04 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
Patent holdings for IPC class C21D 9/04
Total number of patents in this class: 209
10-year publication summary
26
|
16
|
12
|
20
|
21
|
21
|
11
|
13
|
10
|
3
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
JFE Steel Corporation | 6067 |
50 |
Nippon Steel Corporation | 5649 |
25 |
ArcelorMittal | 1887 |
12 |
Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. | 45 |
12 |
Voestalpine Schienen GmbH | 16 |
11 |
Nippon Steel & Sumitomo Metal Corporation | 1990 |
9 |
Danieli & C. Officine Meccaniche S.p.A. | 680 |
8 |
ArcelorMittal Investigacion y Desarrollo SL | 209 |
7 |
Dai-Ichi High Frequency Co., Ltd. | 34 |
4 |
EVRAZ Inc. NA Canada | 4 |
4 |
Pangang Group Panzhihua Steel & Vanadium Co., Ltd. | 7 |
4 |
Wuhan Iron and Steel Company Limited | 23 |
4 |
Caterpillar Inc. | 8877 |
3 |
Huazhong University of Science and Technology | 930 |
3 |
Pangang Group Research Institute Co., Ltd. | 21 |
3 |
Primetals Technologies Italy S.r.l. | 16 |
3 |
VAE Eisenbahnsysteme GmbH | 16 |
3 |
VAE GmbH | 29 |
3 |
Wuhan Nrd Laser Engineering Co., Ltd | 8 |
3 |
Illinois Tool Works Inc. | 11152 |
2 |
Other owners | 36 |