- 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 9/48 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for sheet metals deep-drawing sheets
Patent holdings for IPC class C21D 9/48
Total number of patents in this class: 455
10-year publication summary
|
34
|
36
|
37
|
38
|
35
|
35
|
38
|
15
|
14
|
13
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2384 |
74 |
| JFE Steel Corporation | 7044 |
50 |
| Nippon Steel Corporation | 6476 |
38 |
| ThyssenKrupp Steel Europe AG | 962 |
33 |
| Voestalpine Stahl GmbH | 365 |
14 |
| POSCO Co., Ltd. | 1593 |
13 |
| Tata Steel Ijmuiden B.V. | 311 |
13 |
| Salzgitter Flachstahl GmbH | 161 |
11 |
| ThyssenKrupp AG | 3336 |
11 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2871 |
10 |
| Tata Steel Nederland Technology BV | 152 |
10 |
| ThyssenKrupp Rasselstein GmbH | 71 |
9 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
8 |
| ArcelorMittal Investigacion y Desarrollo SL | 209 |
7 |
| Schwartz GmbH | 58 |
7 |
| ArcelorMittal France | 89 |
5 |
| SMS Group GmbH | 1141 |
5 |
| ThyssenKrupp Steel USA, LLC | 7 |
5 |
| Volkswagen AG | 7383 |
5 |
| NIPPON STEEL Stainless Steel Corporation | 276 |
5 |
| Other owners | 122 |