A62C 3/0221
For tunnels
Official title: {for tunnels}
A62C3/0221 (For tunnels) appears on 48 US grants and 64 published applications in this corpus.
Search patents in A62C- Granted patents
- 48
- Published applications
- 64
- Assignees
- 32
- Inventors
- 108
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2001 | 3 | 2 |
| 2002 | 5 | 3 |
| 2003 | 3 | 2 |
| 2004 | 1 | 0 |
| 2005 | 0 | 2 |
| 2006 | 1 | 2 |
| 2007 | 0 | 3 |
| 2008 | 2 | 6 |
| 2009 | 1 | 4 |
| 2010 | 0 | 1 |
| 2011 | 2 | 1 |
| 2012 | 1 | 4 |
| 2013 | 2 | 3 |
| 2014 | 3 | 3 |
| 2015 | 2 | 0 |
| 2016 | 1 | 5 |
| 2017 | 3 | 3 |
| 2018 | 4 | 2 |
| 2019 | 3 | 5 |
| 2020 | 1 | 3 |
| 2021 | 2 | 1 |
| 2022 | 2 | 1 |
| 2023 | 2 | 4 |
| 2024 | 1 | 2 |
| 2025 | 1 | 2 |
| 2026 | 2 | 0 |
By publication year. 2026 runs to 8 Oct.
Recent patents
- Method and apparatus for testing a tunnel fire suppression system10 Feb 2026US 12,544,611 B2Paradigm Flow Services Limited
- Transport facility27 Jan 2026US 12,534,954 B2Daifuku Co., Ltd.
- Mobile liquid nitrogen fire extinguishing system and method for utility tunnel10 Jun 2025US 12,324,939 B2China University of Mining and Technology
- Roadway conduit systems and methods13 Aug 2024US 12,060,795 B2Electricwaze LLC
- Multi-dimensional space load and fire test system for tunnel structure, and method for implementing same16 May 2023US 11,650,135 B2China University of Mining and Technology
- Film tunnel for roadways28 Aug 2025US 2025/0270930 A1Energy Membrane GmbH
- Roadway conduit systems and methods27 Mar 2025US 2025/0101870 A1Electricwaze LLC
- Transport Facility12 Sep 2024US 2024/0301747 A1Daifuku Co., Ltd.
- Method and apparatus for fire ventilation and smoke evacuation in running train tunnel20 Jun 2024US 2024/0200453 A1China Academy of Safety Science and Technology
- Method and apparatus for testing a tunnel fire suppression system30 Nov 2023US 2023/0381565 A1Paradigm Flow Services Limited
Most cited
By later US patents
- Hypoxic fire prevention and fire suppression systems with breathable fire extinguishing compositions for human occupied environments92US 6,401,487 B12002
- Hyperbaric hypoxic fire escape and suppression systems for multilevel buildings, transportation tunnels and other human-occupied environments84US 6,560,991 B12003
- Hypoxic fire prevention and fire suppression systems and breathable fire extinguishing compositions for human occupied environments80US 6,418,752 B22002
- Mobile firefighting systems with breathable hypoxic fire extinguishing compositions for human occupied environments79US 6,502,421 B22003
- Tunnel fire suppression system and methods for selective delivery of breathable fire suppressant directly to fire site63US 6,557,374 B22003