- 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 6/00 - Heat treatment of ferrous alloys
Patent holdings for IPC class C21D 6/00
Total number of patents in this class: 4167
10-year publication summary
|
297
|
358
|
378
|
375
|
325
|
390
|
342
|
396
|
389
|
41
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7179 |
553 |
| Nippon Steel Corporation | 6595 |
440 |
| ArcelorMittal | 2461 |
392 |
| POSCO Co., Ltd. | 1634 |
329 |
| Baoshan Iron & Steel Co., Ltd. | 1046 |
145 |
| Hitachi Metals, Ltd. | 1937 |
97 |
| ThyssenKrupp Steel Europe AG | 973 |
62 |
| NIPPON STEEL Stainless Steel Corporation | 276 |
56 |
| POSCO | 2154 |
55 |
| Voestalpine Stahl GmbH | 375 |
41 |
| Hyundai Steel Company | 473 |
40 |
| Proterial, Ltd. | 904 |
35 |
| Daido Steel Co., Ltd. | 277 |
33 |
| Salzgitter Flachstahl GmbH | 161 |
31 |
| ThyssenKrupp AG | 3393 |
28 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2862 |
27 |
| Outokumpu Oyj | 264 |
25 |
| Aperam | 130 |
24 |
| Tata Steel Ijmuiden B.V. | 313 |
24 |
| GM Global Technology Operations LLC | 15602 |
23 |
| Other owners | 1707 |