- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 15/15 - Means counteracting entry of dirtBuilt-in cleaning devices
Patent holdings for IPC class E21D 15/15
Total number of patents in this class: 1
10-year publication summary
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1
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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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0
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0
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0
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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Caterpillar Inc. | 10284 |
1 |
| Other owners | 0 |