B61L 27/20
Trackside control of safe travel of vehicle or train
Official title: Trackside control of safe travel of vehicle or train, e.g. braking curve calculation
B61L27/20 (Trackside control of safe travel of vehicle or train) appears on 436 US grants and 536 published applications in this corpus.
Search patents in B61L- Granted patents
- 436
- Published applications
- 536
- Assignees
- 165
- Inventors
- 967
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 3 |
| 2003 | 4 | 3 |
| 2004 | 1 | 5 |
| 2005 | 3 | 5 |
| 2006 | 7 | 8 |
| 2007 | 4 | 4 |
| 2008 | 2 | 0 |
| 2009 | 1 | 5 |
| 2010 | 3 | 6 |
| 2011 | 0 | 5 |
| 2012 | 7 | 7 |
| 2013 | 9 | 9 |
| 2014 | 10 | 17 |
| 2015 | 12 | 21 |
| 2016 | 18 | 35 |
| 2017 | 27 | 28 |
| 2018 | 23 | 33 |
| 2019 | 28 | 49 |
| 2020 | 26 | 38 |
| 2021 | 24 | 45 |
| 2022 | 31 | 37 |
| 2023 | 32 | 49 |
| 2024 | 48 | 62 |
| 2025 | 50 | 33 |
| 2026 | 36 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Methods and systems for decentralized rail signaling and positive train control6 Oct 2026US 12,752,823 B2Metrom Rail, LLC
- Intrusion detection6 Oct 2026US 12,752,827 B2International Electronic Machines Corp.
- Railway management system with brake calculation and related method29 Sep 2026US 12,746,959 B2Wsp Global, Inc.
- Method and apparatus for a train control system8 Sep 2026US 12,728,901 B2
- Positive train control simulation system and method therefor8 Sep 2026US 12,731,505 B2BNSF Railway Company
- Vehicle system and method1 Oct 2026US 2026/0296509 A1Transportation IP Holdings, LLC
- Methods and systems for achieving vital ultra-wideband (uwb) based train control17 Sep 2026US 2026/0274312 A1Metrom Rail, LLC
- Fully automatic train supervision system, method, device, and storage medium10 Sep 2026US 2026/0264729 A1Casco Signal Ltd.
- Method and system for protecting operations in a vacuum environment of an ultra-high-speed magnetic levitation low vacuum tube3 Sep 2026US 2026/0257707 A1CRSC Research & Design Institute Group Co., Ltd.
- Integrated intelligent cab system for train drivers3 Sep 2026US 2026/0257708 A1Casco Signal Ltd.
Most cited
By later US patents
- Train location and control using spread spectrum radio communications153US 5,420,883 AHughes Aircraft Company · 1995
- Railroad communication system144US 4,582,280 AHarris Corporation · 1986
- Radio based railway signaling and traffic control system130US 4,711,418 AGeneral Signal Corporation · 1987
- Incremental train control system117US 5,533,695 AHarmon Industries, Inc. · 1996
- Railway signalling system116US 5,437,422 AWestinghouse Brake and Signal Holdings Limited · 1995