- 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 1/09 - Surface hardening by particle radiation
Patent holdings for IPC class C21D 1/09
Total number of patents in this class: 280
10-year publication summary
26
|
31
|
20
|
18
|
22
|
16
|
15
|
10
|
10
|
5
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Etxe-tar, S.A. | 62 |
14 |
Jiangsu University | 950 |
8 |
Nippon Steel Corporation | 5649 |
8 |
Toyota Motor Corporation | 28582 |
5 |
Aisin AW Co., Ltd. | 2430 |
5 |
Ikergune A.I.E. | 6 |
5 |
General Electric Company | 18133 |
4 |
Gestamp HardTech AB | 112 |
4 |
Huazhong University of Science and Technology | 930 |
4 |
Nippon Steel & Sumitomo Metal Corporation | 1990 |
4 |
Wuhan Nrd Laser Engineering Co., Ltd | 8 |
4 |
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | 6132 |
4 |
Robert Bosch GmbH | 40953 |
3 |
Benteler Automobiltechnik GmbH | 258 |
3 |
KS Kolbenschmidt GmbH | 164 |
3 |
MAHLE International GmbH | 2670 |
3 |
Metal Improvement Company, LLC | 76 |
3 |
POSCO | 2222 |
3 |
SITECH Sitztechnik GmbH | 32 |
3 |
Taiho Kogyo Co., Ltd. | 341 |
3 |
Other owners | 187 |