B61L 1/187
Use of alternating current
Official title: {Use of alternating current}
B61L1/187 (Use of alternating current) appears on 62 US grants and 39 published applications in this corpus.
Search patents in B61L- Granted patents
- 62
- Published applications
- 39
- Assignees
- 40
- Inventors
- 85
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 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 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 5 |
| 2012 | 0 | 0 |
| 2013 | 4 | 1 |
| 2014 | 2 | 4 |
| 2015 | 2 | 0 |
| 2016 | 2 | 3 |
| 2017 | 1 | 1 |
| 2018 | 2 | 2 |
| 2019 | 1 | 3 |
| 2020 | 3 | 1 |
| 2021 | 3 | 5 |
| 2022 | 1 | 4 |
| 2023 | 1 | 1 |
| 2024 | 6 | 3 |
| 2025 | 3 | 4 |
| 2026 | 3 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Grade crossing system including grade crossing predictor in electrified propulsion territory1 Sep 2026US 12,722,676 B2Siemens Mobility GmbH
- Rail bond monitor18 Aug 2026US 12,709,313 B2Modular Railway Systems
- Railway detection system, railway infrastructure and method for detecting the presence of a railway vehicle2 Jun 2026US 12,643,583 B2
- Broken rail detector4 Nov 2025US 12,459,551 B2Athena Industrial Technologies Inc.
- Broken rail detector8 Jul 2025US 12,351,220 B2Athena Industrial Technologies Inc.
- Broken rail detector17 Jul 2025US 2025/0229814 A1Athena Industrial Technologies Inc.
- Grade crossing system including grade crossing predictor in electrified propulsion territory12 Jun 2025US 2025/0187496 A1Siemens Mobility GmbH
- Computer implemented method for determining railway vehicle movement profile type of a railway vehicle movement profile and controller of a track circuit system20 Mar 2025US 2025/0091625 A1ALSTOM Holdings
- Computer implemented method for determining railway vehicle movement profile type of a railway vehicle movement profile and controller of a track circuit system13 Feb 2025US 2025/0050922 A1Alstom Transport Technologies
- Broken rail detector22 Aug 2024US 2024/0278815 A1Athena Industrial Technologies Inc.
Most cited
By later US patents
- Digital train system for automatically detecting trains approaching a crossing24US 7,254,467 B2General Electric Company · 2007
- Railway signal system23US 3,987,989 AErico Rail Products Company · 1976
- Train approach detector23US 4,365,777 AModern Industries Signal Equipment, Inc. · 1982
- Method for detecting the extent of clear, intact track near a railway vehicle21US 9,102,341 B2Transportation Technology Center, Inc. · 2015
- Track circuits with cab signals for dual gage railroads19US 4,022,408 AWestinghouse Air Brake Company · 1977