- All sections
- E - Fixed constructions
- E21D - Shaftstunnelsgallerieslarge underground chambers
- E21D 13/04 - Special equipmentAccessories
Patent holdings for IPC class E21D 13/04
Total number of patents in this class: 8
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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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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| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Channell Commercial Corporation | 94 |
2 |
| China University of Mining and Technology | 1266 |
1 |
| PRC Composites, LLC | 6 |
1 |
| Rambor Pty Limited | 5 |
1 |
| Shanxi Lu'an Environmental Energy Development Co., Ltd | 8 |
1 |
| Jiangsu Gaoshenghuayu Power Equipment Manufacturing Co., Ltd. | 1 |
1 |
| Shandong Lutai Holding Group Co., Ltd. | 1 |
1 |
| Other owners | 0 |