- 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 6/02 - Hardening by precipitation
Patent holdings for IPC class C21D 6/02
Total number of patents in this class: 253
10-year publication summary
27
|
31
|
25
|
18
|
34
|
14
|
23
|
22
|
16
|
2
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
ArcelorMittal | 1887 |
15 |
Nippon Steel Corporation | 5649 |
11 |
Daido Steel Co., Ltd. | 237 |
9 |
QuesTek Innovations LLC | 65 |
9 |
GE Infrastructure Technology, LLC | 5873 |
8 |
ThyssenKrupp Steel Europe AG | 924 |
7 |
Aubert & Duval | 106 |
6 |
JFE Steel Corporation | 6067 |
6 |
POSCO Co., Ltd. | 1059 |
6 |
Uddeholms Aktiebolag | 197 |
6 |
Hitachi Metals, Ltd. | 2175 |
5 |
voestalpine Böhler Edelstahl GmbH & Co KG | 50 |
5 |
Nippon Steel & Sumikin Stainless Steel Corporation | 171 |
4 |
Ovako Sweden AB | 26 |
4 |
Physical Systems, Inc. | 43 |
4 |
United States Steel Corporation | 168 |
4 |
The Boeing Company | 19843 |
3 |
Aperam | 104 |
3 |
ArcelorMittal Investigacion y Desarrollo SL | 209 |
3 |
L.E. Jones Company, LLC | 16 |
3 |
Other owners | 132 |