- 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 1/09 - Surface hardening by direct application of electrical or wave energySurface hardening by particle radiation
Patent holdings for IPC class C21D 1/09
Total number of patents in this class: 270
10-year publication summary
|
25
|
20
|
18
|
22
|
13
|
15
|
9
|
10
|
9
|
8
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Etxe-tar, S.A. | 63 |
14 |
| Nippon Steel Corporation | 6482 |
8 |
| Jiangsu University | 1124 |
7 |
| Toyota Motor Corporation | 33440 |
5 |
| Aisin AW Co., Ltd. | 2302 |
5 |
| Ikergune A.I.E. | 6 |
5 |
| Gestamp HardTech AB | 104 |
4 |
| Huazhong University of Science and Technology | 1082 |
4 |
| Nippon Steel & Sumitomo Metal Corporation | 1987 |
4 |
| Wuhan Nrd Laser Engineering Co., Ltd | 8 |
4 |
| Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | 6121 |
4 |
| General Electric Company | 13840 |
3 |
| Robert Bosch GmbH | 43063 |
3 |
| Benteler Automobiltechnik GmbH | 296 |
3 |
| KS Kolbenschmidt GmbH | 148 |
3 |
| MAHLE International GmbH | 2828 |
3 |
| Metal Improvement Company, LLC | 72 |
3 |
| POSCO | 2175 |
3 |
| SITECH Sitztechnik GmbH | 28 |
3 |
| University of Rochester | 1324 |
3 |
| Other owners | 179 |