- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 1/00 - Ventilation of mines or tunnelsDistribution of ventilating currents
Patent holdings for IPC class E21F 1/00
Total number of patents in this class: 165
10-year publication summary
|
14
|
10
|
8
|
13
|
20
|
5
|
10
|
14
|
11
|
4
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Electricwaze LLC | 13 |
11 |
| Mosen Limited | 9 |
7 |
| Shandong University of Science and Technology | 546 |
5 |
| China University of Mining and Technology, Beijing | 105 |
4 |
| Korea Railroad Research Institute | 185 |
4 |
| Howden Alphair Ventilating Systems Inc. | 5 |
3 |
| MANN+HUMMEL GmbH | 1812 |
3 |
| Polyvent Pty Ltd | 4 |
3 |
| Howden Canada Inc. | 7 |
3 |
| China Railway No.5 Engineering Group Co., Ltd. | 18 |
3 |
| Talleres Zitron, S.A. | 18 |
2 |
| University of Kentucky Research Foundation | 714 |
2 |
| Accutron Instruments Inc. | 6 |
2 |
| Qingdao University of Technology | 644 |
2 |
| Royal Industrial Tech Corp. | 8 |
2 |
| Tianjin Architecture Design Institute | 12 |
2 |
| Tianjin Desheng Solar Technology Co., Ltd | 24 |
2 |
| Glacies Technologies Inc. | 4 |
2 |
| China Mcc5 Group Corp. Ltd | 28 |
2 |
| NEC Corporation | 37135 |
1 |
| Other owners | 100 |