- 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 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
Patent holdings for IPC class C21D 8/00
Total number of patents in this class: 1189
10-year publication summary
|
104
|
114
|
94
|
90
|
94
|
97
|
103
|
56
|
94
|
31
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6139 |
169 |
| JFE Steel Corporation | 6730 |
119 |
| ArcelorMittal | 2197 |
54 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
50 |
| Baoshan Iron & Steel Co., Ltd. | 950 |
40 |
| POSCO Co., Ltd. | 1381 |
40 |
| POSCO | 2188 |
30 |
| ThyssenKrupp Steel Europe AG | 950 |
15 |
| Hitachi Metals, Ltd. | 1990 |
14 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2866 |
12 |
| Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. | 70 |
12 |
| Hyundai Motor Company | 21451 |
11 |
| ThyssenKrupp AG | 3254 |
11 |
| ATI Properties LLC | 204 |
10 |
| Magna International Inc. | 1219 |
10 |
| NIPPON STEEL Stainless Steel Corporation | 290 |
10 |
| Daido Steel Co., Ltd. | 262 |
9 |
| Hyundai Steel Company | 389 |
9 |
| Schwartz GmbH | 58 |
9 |
| Shandong Iron and Steel Company Ltd | 33 |
9 |
| Other owners | 546 |