E21F 1/08
Ventilation arrangements in connection with air ducts
Official title: Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators ({E21F1/003 takes precedence}; ventilators in general F04D)
E21F1/08 (Ventilation arrangements in connection with air ducts) appears on 13 US grants and 33 published applications in this corpus.
Search patents in E21F- Granted patents
- 13
- Published applications
- 33
- Assignees
- 20
- Inventors
- 90
- Latest grant
- 25 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2008 | 0 | 1 |
| 2009 | 0 | 2 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 2 |
| 2015 | 0 | 1 |
| 2016 | 0 | 7 |
| 2017 | 2 | 5 |
| 2018 | 1 | 2 |
| 2019 | 5 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 4 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 1 |
| 2026 | 0 | 3 |
By publication year. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Coal and gas outburst monitoring device25 Mar 2025US 12,258,865 B2Henan Polytechnic University
- Flood protection for underground air vents2 Apr 2024US 11,946,376 B2Floodbreak, L.L.C.
- Split air cabin ventilation system for construction of tunnel inclined shaft and ventilation method using same13 Jun 2023US 11,674,392 B2Chang An University
- Dry filter with enhanced separation output and convenient dimensions31 Aug 2021US 11,103,820 B2CFT GmbH Compact Filter Technic
- Flood protection for underground air vents8 Oct 2019US 10,435,906 B2Floodbreak, L.L.C.
- System and method for regulating non-energy-consuming complex environment in mine based on compressed air energy storage6 Aug 2026US 2026/0226832 A1China University of Geosciences (Wuhan)
- Tempering assembly for tempering air of a facility and corresponding method30 Apr 2026US 2026/0117993 A1Glacies Technologies Inc.
- Ventilation System for Underground Environments29 Jan 2026US 2026/0028911 A1
- Coal and gas outburst monitoring device27 Feb 2025US 2025/0067180 A1Henan Polytechnic University
- Flood protection for underground air vents25 Aug 2022US 2022/0268158 A1Floodbreak, L.L.C.
Most cited
By later US patents