- All sections
- C - Chemistry; metallurgy
- C21D - Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making 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: 3451
10-year publication summary
|
300
|
355
|
308
|
367
|
381
|
379
|
332
|
404
|
338
|
121
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 6067 |
448 |
| Nippon Steel Corporation | 5649 |
353 |
| ArcelorMittal | 1887 |
251 |
| POSCO Co., Ltd. | 1059 |
246 |
| Baoshan Iron & Steel Co., Ltd. | 832 |
112 |
| Hitachi Metals, Ltd. | 2175 |
99 |
| ThyssenKrupp Steel Europe AG | 924 |
57 |
| POSCO | 2222 |
55 |
| NIPPON STEEL Stainless Steel Corporation | 254 |
49 |
| Voestalpine Stahl GmbH | 311 |
34 |
| Salzgitter Flachstahl GmbH | 155 |
29 |
| ThyssenKrupp AG | 3086 |
27 |
| Daido Steel Co., Ltd. | 237 |
26 |
| Outokumpu Oyj | 250 |
25 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 171 |
24 |
| Hyundai Steel Company | 310 |
22 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
22 |
| Tata Steel Ijmuiden B.V. | 283 |
22 |
| Aperam | 104 |
21 |
| United States Steel Corporation | 168 |
21 |
| Other owners | 1508 |