- 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 1/18 - HardeningQuenching with or without subsequent tempering
Patent holdings for IPC class C21D 1/18
Total number of patents in this class: 2236
10-year publication summary
|
151
|
161
|
197
|
153
|
138
|
148
|
189
|
277
|
252
|
142
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6969 |
289 |
| ArcelorMittal | 2725 |
204 |
| JFE Steel Corporation | 7617 |
194 |
| POSCO Co., Ltd. | 2028 |
76 |
| Nippon Steel & Sumitomo Metal Corporation | 1981 |
63 |
| Baoshan Iron & Steel Co., Ltd. | 1126 |
58 |
| Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | 2842 |
44 |
| ThyssenKrupp Steel Europe AG | 996 |
44 |
| Voestalpine Stahl GmbH | 390 |
41 |
| NTN Corporation | 4923 |
38 |
| Nanjing Iron&Steel Co.,Ltd. | 188 |
30 |
| Caterpillar Inc. | 10302 |
21 |
| Voestalpine Metal Forming GmbH | 86 |
20 |
| GM Global Technology Operations LLC | 16219 |
17 |
| POSCO | 2143 |
17 |
| Hitachi Metals, Ltd. | 1823 |
16 |
| Jiangyin Xingcheng Special Steel Works Co., Ltd. | 64 |
16 |
| Hyundai Steel Company | 546 |
15 |
| ThyssenKrupp AG | 3332 |
14 |
| Aktiebolaget SKF | 3151 |
12 |
| Other owners | 1007 |