- 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: 3952
10-year publication summary
|
355
|
308
|
367
|
382
|
383
|
333
|
408
|
352
|
396
|
224
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6767 |
524 |
| Nippon Steel Corporation | 6166 |
414 |
| ArcelorMittal | 2227 |
346 |
| POSCO Co., Ltd. | 1395 |
309 |
| Baoshan Iron & Steel Co., Ltd. | 955 |
128 |
| Hitachi Metals, Ltd. | 1990 |
99 |
| ThyssenKrupp Steel Europe AG | 950 |
61 |
| POSCO | 2189 |
54 |
| NIPPON STEEL Stainless Steel Corporation | 292 |
54 |
| Voestalpine Stahl GmbH | 353 |
37 |
| Hyundai Steel Company | 396 |
32 |
| Salzgitter Flachstahl GmbH | 158 |
32 |
| Daido Steel Co., Ltd. | 268 |
31 |
| Proterial, Ltd. | 824 |
31 |
| ThyssenKrupp AG | 3266 |
28 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2872 |
25 |
| Outokumpu Oyj | 259 |
25 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 168 |
23 |
| Tata Steel Ijmuiden B.V. | 304 |
23 |
| Aperam | 117 |
22 |
| Other owners | 1654 |