B61L 29/24
Means for warning road traffic that a gate is closed or closing
Official title: Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
B61L29/24 (Means for warning road traffic that a gate is closed or closing) appears on 314 US grants and 306 published applications in this corpus.
Search patents in B61L- Granted patents
- 314
- Published applications
- 306
- Assignees
- 134
- Inventors
- 506
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 0 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 6 | 0 |
| 1999 | 5 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 3 |
| 2002 | 11 | 6 |
| 2003 | 7 | 4 |
| 2004 | 6 | 10 |
| 2005 | 3 | 9 |
| 2006 | 8 | 14 |
| 2007 | 4 | 9 |
| 2008 | 8 | 9 |
| 2009 | 3 | 5 |
| 2010 | 5 | 3 |
| 2011 | 4 | 7 |
| 2012 | 5 | 7 |
| 2013 | 11 | 17 |
| 2014 | 11 | 17 |
| 2015 | 13 | 11 |
| 2016 | 12 | 12 |
| 2017 | 12 | 13 |
| 2018 | 9 | 16 |
| 2019 | 14 | 22 |
| 2020 | 18 | 14 |
| 2021 | 16 | 23 |
| 2022 | 13 | 14 |
| 2023 | 14 | 23 |
| 2024 | 19 | 14 |
| 2025 | 14 | 15 |
| 2026 | 10 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Intrusion detection6 Oct 2026US 12,752,827 B2International Electronic Machines Corp.
- Railroad crossing warning system for enhanced route planning based on spectrogram analysis1 Sep 2026US 12,722,675 B2
- Grade crossing system including grade crossing predictor in electrified propulsion territory1 Sep 2026US 12,722,676 B2Siemens Mobility GmbH
- Warning light assembly with orientation sensor, and railway crossing installation including the same14 Jul 2026US 12,680,686 B2Railway Equipment Company, Inc.
- Vehicle system and method9 Jun 2026US 12,649,504 B2Transportation IP Holdings, LLC
- Dangerous area notification apparatus20 Aug 2026US 2026/0247068 A1NTT, Inc.
- Train crossing warning system, apparatuses and methods therefor2 Jul 2026US 2026/0184258 A1Rapidsos, Inc.
- Systems and methods with enhanced predictive railroad crossing traffic notification and railroad worker safety notification2 Jul 2026US 2026/0184357 A1
- Railway control and field device switching system25 Jun 2026US 2026/0181046 A1Hitachi Rail Sts USA, Inc.
- Methods and systems for ultra-wideband (uwb) based subway personnel detection2 Apr 2026US 2026/0093024 A1Metrom Rail, LLC
Most cited
By later US patents
- Vehicle-based navigation system with smart map filtering, portable unit home-base registration and multiple navigation system preferential use356US 6,553,308 B1Donnelly Corporation · 2003
- Vehicle-based navigation system with smart map filtering, portable unit home-base registration and multiple navigation system preferential use160US 7,151,997 B2Donnelly Corporation · 2006
- Navigation system for a vehicle159US 7,412,328 B2Donnelly Corporation · 2008
- Emergency radio frequency warning device118US 3,949,300 A1976
- Wireless danger proximity warning system and method108US 7,148,791 B2Time Domain Corporation · 2006