- 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: 279
10-year publication summary
|
31
|
25
|
18
|
34
|
14
|
23
|
22
|
20
|
17
|
13
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| ArcelorMittal | 2285 |
34 |
| Nippon Steel Corporation | 6238 |
10 |
| Daido Steel Co., Ltd. | 270 |
9 |
| QuesTek Innovations LLC | 61 |
8 |
| GE Infrastructure Technology, LLC | 6222 |
8 |
| ThyssenKrupp Steel Europe AG | 955 |
7 |
| Aubert & Duval | 111 |
6 |
| JFE Steel Corporation | 6840 |
6 |
| POSCO Co., Ltd. | 1568 |
6 |
| Uddeholms Aktiebolag | 195 |
6 |
| Hitachi Metals, Ltd. | 1982 |
5 |
| voestalpine Böhler Edelstahl GmbH & Co KG | 53 |
5 |
| Nippon Steel & Sumikin Stainless Steel Corporation | 167 |
4 |
| Ovako Sweden AB | 31 |
4 |
| Physical Systems, Inc. | 40 |
4 |
| United States Steel Corporation | 174 |
4 |
| The Boeing Company | 20043 |
3 |
| Aperam | 118 |
3 |
| ArcelorMittal Investigacion y Desarrollo SL | 209 |
3 |
| L.E. Jones Company, LLC | 18 |
3 |
| Other owners | 141 |