- All sections
- F - Mechanical engineering; lighting; heating; weapons; blasting
- F01L - Cyclically operating valves for machines or engines
- F01L 31/02 - Valve drive, valve adjustment during operation, or other valve control, not provided for in groups with tripping-gear; Tripping of valves
Patent holdings for IPC class F01L 31/02
Total number of patents in this class: 4
10-year publication summary
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0
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0
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0
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0
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0
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0
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1
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0
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0
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0
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| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Dosatron International | 68 |
2 |
| National Oilwell Varco, L.P. | 1604 |
1 |
| Tongwei Solar (Hefei) Co., Ltd. | 31 |
1 |
| Other owners | 0 |