- All sections
- C - Chemistry; metallurgy
- C23C - Coating metallic material; coating material with metallic material; surface treatment of metallic material by diffusion into the surface, by chemical conversion or substitution; coating by vacuum evaporation, by sputtering, by ion implantation or by chemical vapour deposition, in general
- C23C 8/22 - Carburising of ferrous surfaces
Patent holdings for IPC class C23C 8/22
Total number of patents in this class: 384
10-year publication summary
32
|
36
|
30
|
30
|
31
|
20
|
31
|
21
|
12
|
4
|
2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Nippon Steel Corporation | 5649 |
30 |
Aisin AW Co., Ltd. | 2430 |
21 |
Swagelok Company | 325 |
15 |
Nippon Steel & Sumitomo Metal Corporation | 1990 |
14 |
Daido Steel Co., Ltd. | 237 |
11 |
NTN Corporation | 5008 |
10 |
Caterpillar Inc. | 8877 |
8 |
NHK Spring Co., Ltd. | 1657 |
8 |
Aktiebolaget SKF | 2700 |
7 |
JFE Steel Corporation | 6067 |
7 |
JTEKT Corporation | 2423 |
6 |
Nissan Motor Co., Ltd. | 12249 |
5 |
Hyundai Motor Company | 19021 |
5 |
Aichi Steel Corporation | 333 |
5 |
ALD Vacuum Technologies GmbH | 138 |
5 |
Aubert & Duval | 106 |
5 |
Sikorsky Aircraft Corporation | 1150 |
5 |
Rtx Corporation | 8674 |
5 |
Honda Motor Co., Ltd. | 24537 |
4 |
Denso Corporation | 23338 |
4 |
Other owners | 204 |