- All sections
- B - Performing operationstransporting
- B63B - Ships or other waterborne vesselsequipment for shipping
- B63B 3/20 - Shells of double type
Patent holdings for IPC class B63B 3/20
Total number of patents in this class: 33
10-year publication summary
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4
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6
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2
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2
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0
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0
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1
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1
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2
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2
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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |