- 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: 299
10-year publication summary
|
25
|
18
|
34
|
14
|
23
|
23
|
20
|
24
|
25
|
5
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2672 |
47 |
| Nippon Steel Corporation | 6871 |
10 |
| Daido Steel Co., Ltd. | 284 |
9 |
| QuesTek Innovations LLC | 61 |
8 |
| GE Infrastructure Technology, LLC | 6171 |
8 |
| ThyssenKrupp Steel Europe AG | 990 |
7 |
| JFE Steel Corporation | 7527 |
6 |
| Uddeholms Aktiebolag | 205 |
6 |
| Hitachi Metals, Ltd. | 1898 |
5 |
| Aubert & Duval | 110 |
5 |
| POSCO Co., Ltd. | 2012 |
5 |
| voestalpine Böhler Edelstahl GmbH & Co KG | 65 |
5 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 157 |
4 |
| Ovako Sweden AB | 33 |
4 |
| Physical Systems, Inc. | 35 |
4 |
| United States Steel Corporation | 172 |
4 |
| The Boeing Company | 20160 |
3 |
| Hilti Aktiengesellschaft | 3668 |
3 |
| Northwestern University | 3543 |
3 |
| Aperam | 138 |
3 |
| Other owners | 150 |