E21F 1/003
Ventilation of traffic tunnels
Official title: {Ventilation of traffic tunnels (during construction E21F1/04 - E21F3/00)}
E21F1/003 (Ventilation of traffic tunnels) appears on 29 US grants and 33 published applications in this corpus.
Search patents in E21F- Granted patents
- 29
- Published applications
- 33
- Assignees
- 31
- Inventors
- 107
- Latest grant
- 25 Mar 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 0 |
| 2015 | 1 | 1 |
| 2016 | 1 | 1 |
| 2017 | 4 | 5 |
| 2018 | 2 | 2 |
| 2019 | 1 | 3 |
| 2020 | 2 | 4 |
| 2021 | 3 | 4 |
| 2022 | 1 | 1 |
| 2023 | 3 | 0 |
| 2024 | 2 | 3 |
| 2025 | 1 | 4 |
By publication year. Applications have been published since 2001.
Recent patents
- Coal and gas outburst monitoring device25 Mar 2025US 12,258,865 B2Henan Polytechnic University
- Roadway conduit systems and methods13 Aug 2024US 12,060,795 B2Electricwaze LLC
- Train station, in particular a tunnel-type train station, and use of a filter unit in a train station16 Jul 2024US 12,038,203 B2Mann+Hummel GmbH
- Roadway conduit systems and methods26 Sep 2023US 11,767,757 B2Electricwaze LLC
- Split air cabin ventilation system for construction of tunnel inclined shaft and ventilation method using same13 Jun 2023US 11,674,392 B2Chang An University
- 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.
- Film tunnel for roadways28 Aug 2025US 2025/0270930 A1Energy Membrane GmbH
- Roadway conduit systems and methods27 Mar 2025US 2025/0101870 A1Electricwaze LLC
- Coal and gas outburst monitoring device27 Feb 2025US 2025/0067180 A1Henan Polytechnic University
- Roadway conduit systems and methods31 Oct 2024US 2024/0360759 A1Electricwaze LLC
Most cited
By later US patents
- Train tunnel ventilation method and apparatus25US 4,037,526 ASouthern Pacific Transportation Company · 1977
- Denitrification system22US 5,492,676 AMatsushita Electric Industrial Co., Ltd. · 1996
- Control apparatus for ventilating a tunnel12US 6,724,917 B1Kabushiki Kaisha Toshiba · 2004
- Method and system for tunnel ventilation in normal conditions and in conditions of fire11US 9,752,436 B22017
- System and method for controlling ventilation in a tunnel10US 6,186,888 B1Kabushiki Kaisha Toshiba · 2001