B61D 27/0009
Means for controlling or equalizing air pressure shocks in trains
Official title: {Means for controlling or equalizing air pressure shocks in trains, e.g. when passing or crossing in tunnels}
B61D27/0009 (Means for controlling or equalizing air pressure shocks in trains) appears on 13 US grants and 12 published applications in this corpus.
Search patents in B61D- Granted patents
- 13
- Published applications
- 12
- Assignees
- 10
- Inventors
- 62
- Latest grant
- 6 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 3 |
| 2021 | 0 | 0 |
| 2022 | 1 | 1 |
| 2023 | 2 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Positive and negative oxygen ion air purification system using dielectric barrier discharge for rail transport6 Jan 2026US 12,514,952 B2Knorr-Bremse Espana SA
- Railway vehicle comprising a perfected system of protection against pressure waves7 Mar 2023US 11,597,413 B2SpeedInnov
- System and method for monitoring pressure inside railway vehicle3 Jan 2023US 11,541,920 B2Crrc Qingdao Sifang Co., Ltd.
- Waste exhaust ventilation door automatic control device and vehicle body having the same12 Jul 2022US 11,383,740 B2Crrc Qingdao Sifang Co., Ltd.
- Railway vehicle and method for operating vehicle4 Apr 2006US 7,021,220 B2Hitachi, Ltd.
- Rail vehicle and low-vacuum rail vehicle system29 Jan 2026US 2026/0028054 A1Crrc Qingdao Sifang Co., Ltd.
- Vehicle for passenger transport with a pressure protection device31 Jul 2025US 2025/0242665 A1Siemens Mobility GmbH
- Positive and negative oxygen ion air purification system using dielectric barrier discharge for rail transport22 Jun 2023US 2023/0190985 A1Knorr-Bremse Espana SA
- Pressure regulating apparatus in vehicle and regulating method5 May 2022US 2022/0135090 A1Crrc Qingdao Sifang Co., Ltd.
- System and method for monitoring pressure inside railway vehicle29 Oct 2020US 2020/0339170 A1Crrc Qingdao Sifang Co., Ltd.
Most cited
By later US patents
- Rolling stock ventilator and its control method15US 5,439,415 AHitachi, Ltd. · 1995
- Vehicle sidewall air distribution duct with inflatable gasket13US 5,575,453 AGEC Alsthom Transport SA · 1996
- Methods and apparatus for ventilating carriages11US 5,263,894 AHitachi, Ltd. · 1993
- Method and apparatus for regulating the internal pressure of a ventilated, closed space subjected to variations in external pressure7US 5,984,773 AGEC Alsthom Transport SA · 1999
- Apparatus and method for preventing sudden changes of pressure in vehicles6US 5,647,793 AGEC Alsthom Transport SA · 1997