- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 1/08 - Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
Patent holdings for IPC class E21F 1/08
Total number of patents in this class: 36
10-year publication summary
|
6
|
8
|
2
|
1
|
4
|
2
|
2
|
2
|
2
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Floodbreak, L.L.C. | 33 |
9 |
| Mosen Limited | 9 |
3 |
| CSR Building Products Limited | 47 |
2 |
| Minetek Investments Pty Ltd | 27 |
2 |
| Polyvent Pty Ltd | 3 |
2 |
| Glacies Technologies Inc. | 3 |
2 |
| CFT GmbH Compact Filter Technic | 11 |
1 |
| Evapco, Inc. | 304 |
1 |
| Jack Kennedy Metal Products & Buildings, Inc. | 32 |
1 |
| Nordkote AB | 1 |
1 |
| Talleres Zitron, S.A. | 18 |
1 |
| Ivor Pavetic | 1 |
1 |
| Josip Pavetic | 1 |
1 |
| Svibor Pavetic | 1 |
1 |
| Chang'an University | 186 |
1 |
| HeNan Polytechnic University | 102 |
1 |
| Royal Industrial Tech Corp. | 8 |
1 |
| Vtex Industries Pty Ltd | 1 |
1 |
| Airborne Motor Works Inc. | 19 |
1 |
| China Railway Beijing Engineering Group Co., Ltd | 6 |
1 |
| Other owners | 2 |