B61L 21/04
Electrical locking and release of the route
Official title: Electrical locking and release of the route; Electrical repeat locks
B61L21/04 (Electrical locking and release of the route) appears on 28 US grants and 25 published applications in this corpus.
Search patents in B61L- Granted patents
- 28
- Published applications
- 25
- Assignees
- 24
- Inventors
- 72
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 2 | 1 |
| 2016 | 2 | 1 |
| 2017 | 1 | 1 |
| 2018 | 0 | 2 |
| 2019 | 2 | 1 |
| 2020 | 1 | 1 |
| 2021 | 2 | 1 |
| 2022 | 1 | 3 |
| 2023 | 0 | 4 |
| 2024 | 3 | 1 |
| 2025 | 2 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Switch control method for rail transit signal system, and apparatus for method10 Mar 2026US 12,570,337 B2Casco Signal Ltd.
- Switch control method and apparatus, and storage medium3 Mar 2026US 12,565,249 B2BYD Company Limited
- Interface adapter for controlling a track-side object of a railway installation16 Dec 2025US 12,497,086 B2Pilz GmbH & Co.KG
- Railroad path optimization18 Mar 2025US 12,252,165 B2Advanced Rail Systems, LLC
- Method and system for regulating guided vehicle headways10 Dec 2024US 12,162,525 B2Siemens Mobility GmbH
- Monitoring unit for monitoring a railway track and method for monitoring a railway track12 Dec 2024US 2024/0409136 A1Frauscher Sensortechnik GmbH
- Switch control method for rail transit signal system, and apparatus for method28 Dec 2023US 2023/0415797 A1Casco Signal Ltd.
- Railroad path optimization21 Dec 2023US 2023/0406378 A1Advanced Rail Systems, LLC
- Interface Adapter for Controlling a Track-Side Object of a Railway Installation22 Jun 2023US 2023/0192162 A1Pilz GmbH & Co.KG
- Switch control method and apparatus, and storage medium2 Feb 2023US 2023/0031803 A1BYD Company Limited
Most cited
By later US patents
- Rules-based interlocking engine using virtual gates53US 5,463,552 AAEG Transportation Systems, Inc. · 1995
- Interlocking for a railway system44US 6,308,117 B1Westinghouse Brake and Signal Holdings Limited · 2001
- Computer-controlled interlocking system for a railway installation21US 4,641,243 ASiemens Aktiengesellschaft · 1987
- System comprising a processor13US 5,504,860 AWestinghouse Brake & Signal Holding Ltd. · 1996
- Distributed track network control system10US 6,556,898 B2Bombardier Transportation GmbH · 2003