- 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: 4109
10-year publication summary
|
346
|
297
|
358
|
378
|
375
|
325
|
390
|
340
|
396
|
375
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7074 |
544 |
| Nippon Steel Corporation | 6514 |
431 |
| ArcelorMittal | 2402 |
382 |
| POSCO Co., Ltd. | 1601 |
320 |
| Baoshan Iron & Steel Co., Ltd. | 997 |
139 |
| Hitachi Metals, Ltd. | 1957 |
98 |
| ThyssenKrupp Steel Europe AG | 962 |
61 |
| NIPPON STEEL Stainless Steel Corporation | 276 |
56 |
| POSCO | 2173 |
55 |
| Hyundai Steel Company | 452 |
40 |
| Voestalpine Stahl GmbH | 366 |
39 |
| Proterial, Ltd. | 883 |
35 |
| Daido Steel Co., Ltd. | 275 |
33 |
| Salzgitter Flachstahl GmbH | 162 |
32 |
| ThyssenKrupp AG | 3349 |
28 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
26 |
| Outokumpu Oyj | 261 |
25 |
| Aperam | 129 |
24 |
| GM Global Technology Operations LLC | 15401 |
23 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 164 |
23 |
| Other owners | 1695 |