- 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 6/04 - Hardening by cooling below 0° C
Patent holdings for IPC class C21D 6/04
Total number of patents in this class: 128
10-year publication summary
|
10
|
5
|
12
|
12
|
13
|
11
|
10
|
5
|
9
|
3
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Aubert & Duval | 111 |
11 |
| Daido Steel Co., Ltd. | 270 |
5 |
| Messer Group GmbH | 51 |
5 |
| Hitachi Metals, Ltd. | 1982 |
4 |
| CRS Holdings, Inc. | 30 |
4 |
| Salzgitter Flachstahl GmbH | 159 |
4 |
| ArcelorMittal | 2285 |
3 |
| Jiangsu University | 1099 |
3 |
| QuesTek Innovations LLC | 61 |
3 |
| Sandvik Intellectual Property AB | 1484 |
3 |
| CRS Holdings, LLC | 155 |
3 |
| Shinhokoku Material Corp. | 14 |
3 |
| SNECMA S.A. | 1147 |
2 |
| Hitachi, Ltd. | 15484 |
2 |
| NSK Ltd. | 2777 |
2 |
| Hilti Aktiengesellschaft | 3495 |
2 |
| Aktiebolaget SKF | 2945 |
2 |
| Danmarks Tekniske Universitet | 969 |
2 |
| JFE Steel Corporation | 6840 |
2 |
| Nippon Steel Corporation | 6238 |
2 |
| Other owners | 61 |