- 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 8/28 - Solid state diffusion of only non-metal elements into metallic material surfacesChemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
Patent holdings for IPC class C23C 8/28
Total number of patents in this class: 40
10-year publication summary
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4
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4
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2
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3
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5
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1
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3
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0
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0
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1
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| GM Global Technology Operations LLC | 15150 |
3 |
| Apple Inc. | 55387 |
2 |
| Danmarks Tekniske Universitet | 977 |
2 |
| Aquacare Europe B.V. | 7 |
2 |
| Centre National de La Recherche Scientifique | 10516 |
1 |
| Airbus Operations S.A.S. | 2489 |
1 |
| Sumitomo Electric Industries, Ltd. | 15593 |
1 |
| Hyundai Motor Company | 22257 |
1 |
| Kia Motors Corporation | 7751 |
1 |
| National Institute of Advanced Industrial Science and Technology | 3798 |
1 |
| Aktiebolaget SKF | 2976 |
1 |
| Central Research Institute of Electric Power Industry | 95 |
1 |
| Federal-Mogul Burscheid GmbH | 283 |
1 |
| H.e.f. | 117 |
1 |
| Kirin Company, Limited | 17 |
1 |
| MAHLE International GmbH | 2784 |
1 |
| MAHLE Metal Leve S/A | 157 |
1 |
| Nihon Parkerizing Co., Ltd. | 289 |
1 |
| Nippon Steel Corporation | 6334 |
1 |
| ONERA (Office National d'Etudes et de Recherches Aerospatiales) | 78 |
1 |
| Other owners | 15 |