- 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 6/04 - Hardening by cooling below 0° C
Patent holdings for IPC class C21D 6/04
Total number of patents in this class: 125
10-year publication summary
|
8
|
10
|
5
|
12
|
12
|
13
|
10
|
9
|
5
|
1
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Aubert & Duval | 106 |
13 |
| Messer Group GmbH | 61 |
5 |
| QuesTek Innovations LLC | 65 |
5 |
| Hitachi Metals, Ltd. | 2175 |
4 |
| CRS Holdings, Inc. | 36 |
4 |
| Salzgitter Flachstahl GmbH | 155 |
4 |
| Daido Steel Co., Ltd. | 237 |
3 |
| Jiangsu University | 950 |
3 |
| Sandvik Intellectual Property AB | 1634 |
3 |
| CRS Holdings, LLC | 156 |
3 |
| SNECMA S.A. | 1160 |
2 |
| Robert Bosch GmbH | 40953 |
2 |
| NSK Ltd. | 2719 |
2 |
| Hilti Aktiengesellschaft | 3227 |
2 |
| Aktiebolaget SKF | 2700 |
2 |
| Nippon Steel Corporation | 5649 |
2 |
| Schaeffler KG | 960 |
2 |
| Toshiba Kikai Kabushiki Kaisha | 300 |
2 |
| COLDfire Technology, LLC | 2 |
2 |
| Jiangsu Runfu Mechanical Roll Manufacturing Co., Ltd | 6 |
2 |
| Other owners | 58 |