- All sections
- E - Fixed constructions
- E21F - Safety devices, transport, filling-up, rescue, ventilation, or drainage in or of mines or tunnels
- E21F 5/04 - Spraying barriers
Patent holdings for IPC class E21F 5/04
Total number of patents in this class: 34
10-year publication summary
|
0
|
3
|
1
|
1
|
2
|
9
|
6
|
2
|
1
|
0
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Anhui University of Science and Technology | 178 |
4 |
| PingAn Coal Mining Engineering Research Institute Co. , Ltd | 4 |
4 |
| Shandong University of Science and Technology | 504 |
2 |
| Sany Heavy Equipment Co., Ltd. | 68 |
2 |
| The Procter & Gamble Company | 22147 |
1 |
| Brokk Aktiebolag | 32 |
1 |
| Ecolab USA Inc. | 5349 |
1 |
| Frank T. Porta | 1 |
1 |
| Husqvarna AB | 2884 |
1 |
| Maxum, LLC | 7 |
1 |
| Twin City Fan Companies, Ltd. | 41 |
1 |
| Wind Merchants IP, LLC. | 1 |
1 |
| Xiangtan University | 55 |
1 |
| Jiangsu University of Science and Technology | 361 |
1 |
| Qingdao University of Technology | 591 |
1 |
| Beijing Tiandi-marco Electro-hydraulic Control System Co., Ltd | 7 |
1 |
| Experticia Ingenieros S.A. | 1 |
1 |
| Nanjing Haners Biotechnology Co., Ltd. | 32 |
1 |
| Beijing Ccri-tianma Automation Technology Co., Ltd. | 56 |
1 |
| Obshchestvo S Ogranichennoj Otvetstvennost'yu "partner" | 1 |
1 |
| Other owners | 6 |