B61L 1/182
Use of current of indifferent sort or a combination of different current
Official title: {Use of current of indifferent sort or a combination of different current types}
B61L1/182 (Use of current of indifferent sort or a combination of different current) appears on 14 US grants and 11 published applications in this corpus.
Search patents in B61L- Granted patents
- 14
- Published applications
- 11
- Assignees
- 11
- Inventors
- 33
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 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 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 1 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 1 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Railway detection system, railway infrastructure and method for detecting the presence of a railway vehicle2 Jun 2026US 12,643,583 B2
- Method for determining a change of a state of a track section of a railroad and corresponding apparatus27 Jan 2026US 12,534,117 B2
- Monitoring system for monitoring a condition of an electric rail system and/or of a current collector of the rail system8 Apr 2025US 12,269,519 B2Aktiebolaget Skf
- Method, controller and track circuit for determining the relationship between a track-circuit transmitted current signal and a railway vehicle location on a railway track10 Oct 2023US 11,780,482 B2Alstom Transport Technologies
- Method, controller and system for detecting a leakage of a track signal on at least one railway track7 Jan 2020US 10,527,660 B2Alstom Transport Technologies
- Method for determining a change of a state of a track section of a railroad and corresponding apparatus21 Nov 2024US 2024/0383511 A1ALSTOM Holdings
- Railway detection system, railway infrastructure and method for detecting the presence of a railway vehicle9 May 2024US 2024/0149931 A1ALSTOM Holdings
- Method, controller and track circuit for determining the relationship between a track-circuit transmitted current signal and a railway vehicle location on a railway track18 Aug 2022US 2022/0258781 A1Alstom Transport Technologies
- Quasi-moving block system of train control16 Jun 2022US 2022/0185350 A1Transportation Technology Center, Inc.
- Monitoring system for monitoring a condition of an electric rail system and/or of a current collector of the rail system9 Jan 2020US 2020/0010100 A1Aktiebolaget Skf
Most cited
By later US patents
- Railway signalling systems18US 5,242,136 ABritish Railways Board · 1993
- Railway vehicle safety shunt system5US 6,533,222 B12003
- Shunting device4US 5,464,176 A1995
- Concrete sleeper for track circuitry3US 4,265,400 AHamersley Iron Pty. Limited · 1981
- Method, controller and track circuit for determining the relationship between a track-circuit transmitted current signal and a railway vehicle location on a railway track2US 11,780,482 B2Alstom Transport Technologies · 2023