B61L 21/10
Arrangements for trains which are closely following one another
B61L21/10 (Arrangements for trains which are closely following one another) appears on 73 US grants and 78 published applications in this corpus.
Search patents in B61L- Granted patents
- 73
- Published applications
- 78
- Assignees
- 46
- Inventors
- 130
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 3 |
| 2013 | 1 | 3 |
| 2014 | 1 | 4 |
| 2015 | 6 | 0 |
| 2016 | 3 | 8 |
| 2017 | 5 | 2 |
| 2018 | 2 | 5 |
| 2019 | 5 | 7 |
| 2020 | 3 | 6 |
| 2021 | 7 | 6 |
| 2022 | 9 | 9 |
| 2023 | 6 | 9 |
| 2024 | 5 | 7 |
| 2025 | 6 | 4 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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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
- Vehicle train routing apparatus and method44US 4,361,300 AWestinghouse Electric Corp. · 1982
- Vehicle control system33US 5,947,423 AWestinghouse Brake and Signal Holdings Limited · 1999