B61L 23/042
Track changes detection
Official title: {Track changes detection}
B61L23/042 (Track changes detection) appears on 490 US grants and 607 published applications in this corpus.
Search patents in B61L- Granted patents
- 490
- Published applications
- 607
- Assignees
- 273
- Inventors
- 1,155
- Latest grant
- 1 Sep 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 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 1 |
| 2002 | 6 | 8 |
| 2003 | 7 | 5 |
| 2004 | 4 | 8 |
| 2005 | 5 | 3 |
| 2006 | 3 | 6 |
| 2007 | 6 | 10 |
| 2008 | 5 | 4 |
| 2009 | 4 | 7 |
| 2010 | 6 | 5 |
| 2011 | 4 | 8 |
| 2012 | 5 | 12 |
| 2013 | 6 | 13 |
| 2014 | 9 | 28 |
| 2015 | 15 | 26 |
| 2016 | 15 | 28 |
| 2017 | 28 | 30 |
| 2018 | 21 | 42 |
| 2019 | 34 | 41 |
| 2020 | 38 | 46 |
| 2021 | 34 | 49 |
| 2022 | 37 | 35 |
| 2023 | 33 | 58 |
| 2024 | 43 | 43 |
| 2025 | 47 | 56 |
| 2026 | 31 | 35 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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 bond monitor18 Aug 2026US 12,709,313 B2Modular Railway Systems
- System and method for signalling events through a visibility marker associated with a train28 Jul 2026US 12,691,915 B2Siemens Mobility GmbH
- 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
- Methods and Systems for Automatic Track Inspection and Evaluation1 Oct 2026US 2026/0296511 A1Intramotev Inc.
Most cited
By later US patents
- 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
- Method and apparatus for monitoring railway defects102US 5,867,404 ACairo Systems, Inc. · 1999
- Apparatus and method for detecting defective conditions in railway vehicle wheels and railtracks90US 5,433,111 AGeneral Electric Company · 1995
- Method and apparatus for monitoring railway defects89US 5,956,664 ACairo Systems, Inc. · 1999