- 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: 460
10-year publication summary
|
39
|
40
|
41
|
36
|
36
|
43
|
17
|
14
|
16
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2532 |
76 |
| JFE Steel Corporation | 7362 |
49 |
| Nippon Steel Corporation | 6703 |
38 |
| ThyssenKrupp Steel Europe AG | 984 |
33 |
| POSCO Co., Ltd. | 1665 |
14 |
| Voestalpine Stahl GmbH | 384 |
14 |
| Salzgitter Flachstahl GmbH | 163 |
13 |
| Tata Steel Ijmuiden B.V. | 319 |
13 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2835 |
11 |
| ThyssenKrupp Rasselstein GmbH | 72 |
11 |
| Tata Steel Nederland Technology BV | 156 |
10 |
| ThyssenKrupp AG | 3454 |
9 |
| Nippon Steel & Sumitomo Metal Corporation | 1985 |
8 |
| ArcelorMittal Investigacion y Desarrollo SL | 208 |
7 |
| Schwartz GmbH | 58 |
7 |
| ArcelorMittal France | 73 |
5 |
| SMS Group GmbH | 1169 |
5 |
| ThyssenKrupp Steel USA, LLC | 7 |
5 |
| Volkswagen AG | 7416 |
5 |
| NIPPON STEEL Stainless Steel Corporation | 277 |
5 |
| Other owners | 122 |