- 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 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: 1119
10-year publication summary
|
114
|
104
|
114
|
94
|
90
|
94
|
93
|
99
|
56
|
37
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 5649 |
156 |
| JFE Steel Corporation | 6067 |
113 |
| Nippon Steel & Sumitomo Metal Corporation | 1990 |
50 |
| ArcelorMittal | 1887 |
46 |
| POSCO Co., Ltd. | 1059 |
36 |
| Baoshan Iron & Steel Co., Ltd. | 832 |
33 |
| POSCO | 2222 |
30 |
| ThyssenKrupp Steel Europe AG | 924 |
18 |
| Hitachi Metals, Ltd. | 2175 |
15 |
| Hyundai Motor Company | 19021 |
11 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2865 |
11 |
| ThyssenKrupp AG | 3086 |
11 |
| ATI Properties LLC | 202 |
10 |
| Magna International Inc. | 1236 |
9 |
| Schwartz GmbH | 58 |
9 |
| Kia Motors Corporation | 7946 |
8 |
| Benteler Automobiltechnik GmbH | 258 |
8 |
| Daido Steel Co., Ltd. | 237 |
8 |
| NIPPON STEEL Stainless Steel Corporation | 254 |
8 |
| Hyundai Steel Company | 310 |
7 |
| Other owners | 522 |