B61L 23/16
Track circuits specially adapted for section blocking
B61L23/16 (Track circuits specially adapted for section blocking) appears on 77 US grants and 54 published applications in this corpus.
Search patents in B61L- Granted patents
- 77
- Published applications
- 54
- Assignees
- 40
- Inventors
- 124
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 4 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 3 | 1 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 2 | 1 |
| 2016 | 3 | 6 |
| 2017 | 2 | 4 |
| 2018 | 2 | 4 |
| 2019 | 5 | 4 |
| 2020 | 3 | 1 |
| 2021 | 7 | 5 |
| 2022 | 3 | 7 |
| 2023 | 4 | 6 |
| 2024 | 2 | 1 |
| 2025 | 3 | 1 |
| 2026 | 4 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for virtual block stick circuits7 Jul 2026US 12,673,707 B2BNSF Railway Company
- Railroad virtual track block system16 Jun 2026US 12,654,753 B2BNSF Railway Company
- Light train control system applied to oversea freight railways31 Mar 2026US 12,589,783 B2Casco Signal Ltd.
- Switch control method and apparatus, and storage medium3 Mar 2026US 12,565,249 B2BYD Company Limited
- System and method for virtual block operational status control with long block time delay23 Dec 2025US 12,503,145 B2BNSF Railway Company
- Railroad virtual track block system8 Oct 2026US 2026/0307691 A1BNSF Railway Company
- Axle counter decommissioning system23 Jul 2026US 2026/0208777 A1Dual Inventive Holding B.V.
- Cbtc system based on interval protection and heterogeneous redundancy, and implementation method thereof7 May 2026US 2026/0125089 A1Casco Signal Ltd.
- System and method for virtual block operational status control with long block time delay30 Apr 2026US 2026/0116439 A1BNSF Railway Company
- System and method for virtual block stick circuits30 Jan 2025US 2025/0033679 A1BNSF Railway Company
Most cited
By later US patents
- Positive train control system and apparatus therefor36US 9,434,397 B2Panasec Corporation · 2016
- Method of transferring control of a railway vehicle in a communication based signaling system35US 5,823,481 AUnion Switch & Signal Inc. · 1998
- Coded track circuit repeater having standby mode32US 5,465,926 AUnion Switch & Signal Inc. · 1995
- Railroad motion detecting and signalling system with repeater receiver27US 3,974,991 AErico Rail Products Company · 1976
- Master-Satellite railway track circuit25US 5,145,131 AUnion Switch & Signal Inc. · 1992