B61L 21/00
Station blocking between signal boxes in one yard
B61L21/00 (Station blocking between signal boxes in one yard) appears on 133 US grants and 124 published applications in this corpus.
Search patents in B61L- Granted patents
- 133
- Published applications
- 124
- Assignees
- 77
- Inventors
- 267
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 1 |
| 2008 | 1 | 1 |
| 2009 | 2 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 2 |
| 2012 | 1 | 4 |
| 2013 | 1 | 5 |
| 2014 | 3 | 6 |
| 2015 | 8 | 2 |
| 2016 | 6 | 12 |
| 2017 | 7 | 3 |
| 2018 | 2 | 8 |
| 2019 | 6 | 11 |
| 2020 | 7 | 9 |
| 2021 | 10 | 9 |
| 2022 | 12 | 12 |
| 2023 | 6 | 14 |
| 2024 | 11 | 9 |
| 2025 | 10 | 8 |
| 2026 | 6 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B61L 21/10Arrangements for trains which are closely following one another73
- B61L 21/04Electrical locking and release of the route28
- B61L 21/06Vehicle-on-line indication22
- B61L 21/08Order transmission and reception arrangements for giving or withholding permission8
- B61L 21/02Mechanical locking and release of the route0
Recent patents
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- 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
- Railroad virtual track block system8 Oct 2026US 2026/0307691 A1BNSF Railway Company
- System and method for virtual block operational status control with long block time delay30 Apr 2026US 2026/0116439 A1BNSF Railway Company
- Multi-objective systems and methods for optimally assigning train blocks at a railroad merchandise yard27 Nov 2025US 2025/0360952 A1BNSF Railway Company
- Systems and methods for efficiently switching railcars in a railroad yard24 Jul 2025US 2025/0236323 A1BNSF Railway Company
- System and/or method for platooning12 Jun 2025US 2025/0187639 A1Parallel Systems, Inc.
Most cited
By later US patents
- Virtual block control system for railway vehicle116US 5,398,894 AUnion Switch & Signal Inc. · 1995
- Method and apparatus for initializing an automated train control system109US 5,803,411 AABB Daimler-Benz Transportation (North America) Inc. · 1998
- Short headway communications based train control system55US 8,428,798 B2Wabtec Holding Corp. · 2013
- Rules-based interlocking engine using virtual gates53US 5,463,552 AAEG Transportation Systems, Inc. · 1995
- Vehicle train routing apparatus and method44US 4,361,300 AWestinghouse Electric Corp. · 1982