B61L 23/04
Control, warning or like safety means along the route or between vehicles
Official title: for monitoring the mechanical state of the route
B61L23/04 (Control, warning or like safety means along the route or between vehicles) appears on 835 US grants and 1,096 published applications in this corpus.
Search patents in B61L- Granted patents
- 835
- Published applications
- 1,096
- Assignees
- 425
- Inventors
- 2,038
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 3 | 0 |
| 2000 | 6 | 0 |
| 2001 | 5 | 3 |
| 2002 | 8 | 10 |
| 2003 | 10 | 5 |
| 2004 | 6 | 13 |
| 2005 | 5 | 9 |
| 2006 | 4 | 9 |
| 2007 | 9 | 13 |
| 2008 | 8 | 6 |
| 2009 | 5 | 11 |
| 2010 | 11 | 19 |
| 2011 | 6 | 14 |
| 2012 | 9 | 17 |
| 2013 | 12 | 20 |
| 2014 | 13 | 41 |
| 2015 | 19 | 41 |
| 2016 | 25 | 49 |
| 2017 | 43 | 48 |
| 2018 | 39 | 70 |
| 2019 | 65 | 81 |
| 2020 | 65 | 98 |
| 2021 | 67 | 90 |
| 2022 | 65 | 83 |
| 2023 | 60 | 106 |
| 2024 | 83 | 88 |
| 2025 | 85 | 95 |
| 2026 | 63 | 57 |
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.
- Sensor to sensor edge traffic inference, system and method22 Sep 2026US 12,741,683 B2Konux GmbH
- Systems and methods for detecting tanks in railway environments1 Sep 2026US 12,722,670 B2BNSF Railway Company
- Device and method for monitoring railway health in large windy desert area1 Sep 2026US 12,722,672 B2Lanzhou University
- Method and device for measuring a parameter relevant to the journey of a rail vehicle25 Aug 2026US 12,715,487 B2Siemens Mobility GmbH
- Rail guided carriage system and method for estimating abnormal section of rail guided carriage system8 Oct 2026US 2026/0307689 A1Murata Machinery, Ltd.
- Railroad virtual track block system8 Oct 2026US 2026/0307691 A1BNSF Railway Company
- System and method for improved rail bridge strike detection8 Oct 2026US 2026/0307692 A1Southern Methodist University
- Connector and system8 Oct 2026US 2026/0312341 A1HARTING International Innovation AG
- Autonomous track monitoring system1 Oct 2026US 2026/0296510 A1
Most cited
By later US patents
- Surround surveillance system for mobile body, and mobile body, car, and train using the same238US 6,693,518 B2Sharp Kabushiki Kaisha · 2004
- Ground-based mobile maintenance facilities for unmanned aerial vehicles189US 9,718,564 B1Amazon Technologies, Inc. · 2017
- Automated track inspection vehicle and method122US 6,064,428 ANational Railroad Passenger Corporation · 2000
- Traffic control system utilizing on-board vehicle information measurement apparatus108US 5,332,180 AUnion Switch & Signal Inc. · 1994
- Railroad vehicle accident video recorder105US 6,088,635 ARoadtrac LLC · 2000