- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 3/00 - Cooling or drying of air
Patent holdings for IPC class E21F 3/00
Total number of patents in this class: 20
10-year publication summary
|
4
|
1
|
1
|
0
|
2
|
5
|
0
|
0
|
1
|
1
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China University of Mining and Technology | 1226 |
3 |
| Dräger Safety AG & Co. KGaA | 407 |
2 |
| Polyvent Pty Ltd | 3 |
2 |
| Siemens AG | 24568 |
1 |
| Energy Recovery, Inc. | 175 |
1 |
| GREE Electric Appliances, Inc. of Zhuhai | 3156 |
1 |
| Howden Alphair Ventilating Systems Inc. | 5 |
1 |
| Jack Kennedy Metal Products & Buildings, Inc. | 36 |
1 |
| RAG Aktiengesellschaft | 33 |
1 |
| Shandong University of Science and Technology | 504 |
1 |
| Transport for London | 27 |
1 |
| University of Kentucky Research Foundation | 683 |
1 |
| Qingdao University of Technology | 591 |
1 |
| Electric Light Explosion-protected Technology(shanghai) Co., Ltd. | 1 |
1 |
| Wonam Serwis Spółka z ograniczoną odpowiedzialnością | 1 |
1 |
| Cluff, Daniel L. | 1 |
1 |
| Other owners | 0 |