- 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: 4229
10-year publication summary
|
308
|
367
|
383
|
383
|
333
|
409
|
360
|
398
|
399
|
114
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7349 |
568 |
| Nippon Steel Corporation | 6692 |
454 |
| ArcelorMittal | 2526 |
401 |
| POSCO Co., Ltd. | 1658 |
334 |
| Baoshan Iron & Steel Co., Ltd. | 1074 |
149 |
| Hitachi Metals, Ltd. | 1921 |
95 |
| ThyssenKrupp Steel Europe AG | 984 |
63 |
| POSCO | 2155 |
56 |
| NIPPON STEEL Stainless Steel Corporation | 278 |
56 |
| Voestalpine Stahl GmbH | 384 |
42 |
| Hyundai Steel Company | 496 |
41 |
| Proterial, Ltd. | 924 |
38 |
| Daido Steel Co., Ltd. | 280 |
33 |
| Salzgitter Flachstahl GmbH | 162 |
32 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2836 |
26 |
| Aperam | 133 |
25 |
| Outokumpu Oyj | 262 |
25 |
| Tata Steel Ijmuiden B.V. | 319 |
24 |
| GM Global Technology Operations LLC | 15817 |
23 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 163 |
23 |
| Other owners | 1721 |