- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 15/45 - Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
Patent holdings for IPC class E21D 15/45
Total number of patents in this class: 5
10-year publication summary
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0
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0
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0
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1
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2
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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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| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Caterpillar Inc. | 10109 |
1 |
| Cougar Can Company Pty Ltd. | 3 |
1 |
| Shandong University of Science and Technology | 538 |
1 |
| Zamqua Holding B.V. | 8 |
1 |
| Xinchang Luheng Machinery Co., Ltd | 1 |
1 |
| Other owners | 0 |