- All sections
- C - Chemistrymetallurgy
- C23C - Coating metallic materialcoating material with metallic materialsurface treatment of metallic material by diffusion into the surface, by chemical conversion or substitutioncoating 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: 372
10-year publication summary
|
36
|
30
|
30
|
31
|
20
|
31
|
22
|
13
|
10
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Nippon Steel Corporation | 6012 |
29 |
| Aisin AW Co., Ltd. | 2364 |
20 |
| Swagelok Company | 327 |
15 |
| Nippon Steel & Sumitomo Metal Corporation | 1988 |
14 |
| Daido Steel Co., Ltd. | 258 |
11 |
| NTN Corporation | 4976 |
10 |
| NHK Spring Co., Ltd. | 1769 |
8 |
| Caterpillar Inc. | 9166 |
7 |
| JFE Steel Corporation | 6557 |
7 |
| Aktiebolaget SKF | 2839 |
6 |
| Nissan Motor Co., Ltd. | 12352 |
5 |
| JTEKT Corporation | 2443 |
5 |
| Komatsu Ltd. | 4418 |
5 |
| ALD Vacuum Technologies GmbH | 140 |
5 |
| Aubert & Duval | 106 |
5 |
| Sikorsky Aircraft Corporation | 1123 |
5 |
| Rtx Corporation | 9109 |
5 |
| Denso Corporation | 23769 |
4 |
| Hyundai Motor Company | 20483 |
4 |
| Aichi Steel Corporation | 372 |
4 |
| Other owners | 198 |