E21F 1/00
Ventilation of mines or tunnels
Official title: Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F)
E21F1/00 (Ventilation of mines or tunnels) appears on 171 US grants and 157 published applications in this corpus.
Search patents in E21F- Granted patents
- 171
- Published applications
- 157
- Assignees
- 120
- Inventors
- 401
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 0 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 4 | 1 |
| 2002 | 10 | 2 |
| 2003 | 3 | 5 |
| 2004 | 3 | 2 |
| 2005 | 2 | 0 |
| 2006 | 0 | 2 |
| 2007 | 2 | 3 |
| 2008 | 0 | 4 |
| 2009 | 0 | 2 |
| 2010 | 1 | 4 |
| 2011 | 1 | 5 |
| 2012 | 2 | 5 |
| 2013 | 4 | 5 |
| 2014 | 3 | 17 |
| 2015 | 8 | 6 |
| 2016 | 8 | 12 |
| 2017 | 11 | 17 |
| 2018 | 6 | 11 |
| 2019 | 11 | 6 |
| 2020 | 10 | 9 |
| 2021 | 5 | 10 |
| 2022 | 4 | 4 |
| 2023 | 6 | 6 |
| 2024 | 11 | 7 |
| 2025 | 4 | 8 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21F 1/14Air partitions58
- E21F 1/10Air doors31
- E21F 1/003Ventilation of traffic tunnels29
- E21F 1/04Air ducts28
- E21F 1/08Ventilation arrangements in connection with air ducts13
- E21F 1/006Ventilation at the working face of galleries or tunnels8
- E21F 1/02Test models4
- E21F 1/16Shaft covers4
All 9 subgroupsShow fewer
Recent patents
- System and method for shaping a duct section13 Jan 2026US 12,521,934 B2Plastiques G Plus Inc.
- System and method for sealing and pressurizing enclosed facilities via prefabricated modules, plugs, doors, and inserts28 Oct 2025US 12,455,092 B2
- Coal and gas outburst monitoring device25 Mar 2025US 12,258,865 B2Henan Polytechnic University
- Ventilation method for high gas working face based on alternating intake and air return in mine gallery11 Feb 2025US 12,221,888 B2Taiyuan University of Technology
- Mine cooling and dehumidifying system11 Feb 2025US 12,221,889 B2Shandong University of Science and Technology
- 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)
- Negative Pressure Air-seal Induced System for Controlling Environment of Pipe Jacking Operation4 Jun 2026US 2026/0153029 A1China Mcc5 Group Corp. Ltd
- 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
- Top-down sequential-building construction method for deep and large vertical shaft cavern group25 Dec 2025US 2025/0389189 A1China Tiesiju Civil Engineering Group Co., Ltd.
Most cited
By later US patents
- Horizontal remote mining system, and method120US 5,879,057 AAmvest Corporation · 1999
- Method and an installation for adjusting the flow rate of air in a network of ducts67US 5,269,660 ACompagnie Generale des Matieres Nucleaires · 1993
- Portable ventilation safety device48US 4,770,086 A1988
- Telescopic ventline41US 6,669,552 B12003
- Method and apparatus for supporting ventilation curtains in coal mines39US 5,308,280 ACurtain Buddy Corp. · 1994