- 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: 471
10-year publication summary
|
39
|
40
|
41
|
36
|
36
|
43
|
17
|
14
|
18
|
16
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2720 |
78 |
| JFE Steel Corporation | 7599 |
51 |
| Nippon Steel Corporation | 6945 |
44 |
| ThyssenKrupp Steel Europe AG | 995 |
34 |
| POSCO Co., Ltd. | 2025 |
15 |
| Voestalpine Stahl GmbH | 390 |
14 |
| Salzgitter Flachstahl GmbH | 163 |
13 |
| Tata Steel Ijmuiden B.V. | 328 |
13 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2841 |
11 |
| Tata Steel Nederland Technology BV | 163 |
10 |
| ThyssenKrupp Rasselstein GmbH | 71 |
10 |
| ThyssenKrupp AG | 3354 |
9 |
| Nippon Steel & Sumitomo Metal Corporation | 1981 |
8 |
| ArcelorMittal Investigacion y Desarrollo SL | 208 |
7 |
| Schwartz GmbH | 60 |
7 |
| ArcelorMittal France | 68 |
5 |
| SMS Group GmbH | 1207 |
5 |
| ThyssenKrupp Steel USA, LLC | 7 |
5 |
| Volkswagen AG | 7480 |
5 |
| NIPPON STEEL Stainless Steel Corporation | 276 |
5 |
| Other owners | 122 |