- 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 1/52 - Methods of heating with flames
Patent holdings for IPC class C21D 1/52
Total number of patents in this class: 80
10-year publication summary
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3
|
7
|
8
|
3
|
6
|
4
|
2
|
2
|
5
|
6
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7527 |
6 |
| Fives Stein | 108 |
5 |
| Linde Aktiengesellschaft | 1421 |
4 |
| Tenova S.p.A. | 158 |
4 |
| ThyssenKrupp Steel Europe AG | 990 |
4 |
| ArcelorMittal | 2672 |
3 |
| Baoshan Iron & Steel Co., Ltd. | 1102 |
3 |
| SMS Group GmbH | 1197 |
3 |
| Voestalpine Stahl GmbH | 388 |
3 |
| Air Products and Chemicals, Inc. | 1471 |
2 |
| AGA AB | 5 |
2 |
| ArcelorMittal Investigacion y Desarrollo SL | 207 |
2 |
| Novelis Inc. | 779 |
2 |
| POSCO Co., Ltd. | 2012 |
2 |
| Voestalpine Metal Forming GmbH | 84 |
2 |
| Linde GmbH | 1360 |
2 |
| Illinois Tool Works Inc. | 11863 |
1 |
| GM Global Technology Operations LLC | 16124 |
1 |
| Siemens VAI Metals Technologies SAS | 60 |
1 |
| Aleris Aluminum Duffel BVBA | 28 |
1 |
| Other owners | 27 |