- 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: 4504
10-year publication summary
|
308
|
367
|
383
|
383
|
333
|
409
|
363
|
398
|
400
|
395
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| JFE Steel Corporation | 7660 |
605 |
| Nippon Steel Corporation | 7050 |
512 |
| ArcelorMittal | 2749 |
446 |
| POSCO Co., Ltd. | 2031 |
374 |
| Baoshan Iron & Steel Co., Ltd. | 1134 |
167 |
| Hitachi Metals, Ltd. | 1813 |
91 |
| ThyssenKrupp Steel Europe AG | 996 |
64 |
| POSCO | 2143 |
59 |
| NIPPON STEEL Stainless Steel Corporation | 274 |
57 |
| Hyundai Steel Company | 549 |
44 |
| Voestalpine Stahl GmbH | 394 |
43 |
| Proterial, Ltd. | 959 |
42 |
| Daido Steel Co., Ltd. | 288 |
34 |
| Salzgitter Flachstahl GmbH | 163 |
32 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2844 |
30 |
| Outokumpu Oyj | 272 |
26 |
| Aperam | 143 |
25 |
| GM Global Technology Operations LLC | 16237 |
24 |
| Tata Steel Ijmuiden B.V. | 328 |
24 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 155 |
23 |
| Other owners | 1782 |