- 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: 271
10-year publication summary
|
31
|
20
|
18
|
22
|
16
|
16
|
10
|
10
|
9
|
6
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Etxe-tar, S.A. | 62 |
14 |
| Nippon Steel Corporation | 6207 |
8 |
| Jiangsu University | 1094 |
7 |
| Toyota Motor Corporation | 31819 |
5 |
| Aisin AW Co., Ltd. | 2330 |
5 |
| Ikergune A.I.E. | 6 |
5 |
| Gestamp HardTech AB | 107 |
4 |
| Huazhong University of Science and Technology | 1040 |
4 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
4 |
| Wuhan Nrd Laser Engineering Co., Ltd | 8 |
4 |
| Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | 6107 |
4 |
| General Electric Company | 13811 |
3 |
| Robert Bosch GmbH | 42632 |
3 |
| Benteler Automobiltechnik GmbH | 290 |
3 |
| KS Kolbenschmidt GmbH | 156 |
3 |
| MAHLE International GmbH | 2761 |
3 |
| Metal Improvement Company, LLC | 72 |
3 |
| POSCO | 2186 |
3 |
| SITECH Sitztechnik GmbH | 29 |
3 |
| University of Rochester | 1308 |
3 |
| Other owners | 180 |