- 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 6/02 - Hardening by precipitation
Patent holdings for IPC class C21D 6/02
Total number of patents in this class: 288
10-year publication summary
|
30
|
21
|
18
|
33
|
14
|
17
|
20
|
17
|
14
|
17
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2402 |
40 |
| Nippon Steel Corporation | 6514 |
10 |
| Daido Steel Co., Ltd. | 275 |
9 |
| QuesTek Innovations LLC | 61 |
8 |
| GE Infrastructure Technology, LLC | 6197 |
8 |
| ThyssenKrupp Steel Europe AG | 962 |
7 |
| Aubert & Duval | 112 |
6 |
| JFE Steel Corporation | 7074 |
6 |
| Uddeholms Aktiebolag | 197 |
6 |
| Hitachi Metals, Ltd. | 1957 |
5 |
| POSCO Co., Ltd. | 1601 |
5 |
| voestalpine Böhler Edelstahl GmbH & Co KG | 54 |
5 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 164 |
4 |
| Ovako Sweden AB | 31 |
4 |
| Physical Systems, Inc. | 39 |
4 |
| United States Steel Corporation | 175 |
4 |
| The Boeing Company | 20186 |
3 |
| Hilti Aktiengesellschaft | 3540 |
3 |
| Northwestern University | 3457 |
3 |
| Aperam | 129 |
3 |
| Other owners | 145 |