B61L 3/24
Employing different frequencies or coded pulse groups
Official title: employing different frequencies or coded pulse groups {, e.g. in combination with track circuits}
B61L3/24 (Employing different frequencies or coded pulse groups) appears on 56 US grants and 25 published applications in this corpus.
Search patents in B61L- Granted patents
- 56
- Published applications
- 25
- Assignees
- 35
- Inventors
- 97
- Latest grant
- 5 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 1 |
| 2003 | 2 | 2 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 3 |
| 2012 | 0 | 0 |
| 2013 | 2 | 2 |
| 2014 | 1 | 3 |
| 2015 | 4 | 0 |
| 2016 | 2 | 2 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 3 |
| 2022 | 1 | 1 |
| 2023 | 2 | 0 |
| 2024 | 2 | 1 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Sensor and method for detecting target molecules5 Aug 2025US 12,379,374 B2Southern Methodist University
- Linear induction motor excitation modulation based communication7 May 2024US 11,979,203 B2Rockwell Collins, Inc.
- Sensor and method for detecting target molecules23 Apr 2024US 11,965,878 B2Southern Methodist University
- Wayside to railway vehicle communication method and device9 May 2023US 11,643,122 B2Alstom Transport Technologies
- Vehicle-based device for receiving information from a track-based transmission device14 Feb 2023US 11,577,764 B2Siemens Mobility GmbH
- Sensor and Method for Detecting Target Molecules23 Oct 2025US 2025/0327795 A1Southern Methodist University
- Sensor and Method for Detecting Target Molecules4 Jul 2024US 2024/0219377 A1Southern Methodist University
- Linear induction motor excitation modulation based communication17 Nov 2022US 2022/0368378 A1Rockwell Collins, Inc.
- Sensor and Method for Detecting Target Molecules19 Aug 2021US 2021/0255172 A1Southern Methodist University
- Wayside to railway vehicle communication method and device24 Jun 2021US 2021/0188335 A1Alstom Transport Technologies
Most cited
By later US patents
- Cab signalling system utilizing coded track circuit signals37US 5,263,670 AUnion Switch & Signal Inc. · 1993
- Method of transferring control of a railway vehicle in a communication based signaling system35US 5,823,481 AUnion Switch & Signal Inc. · 1998
- Cab signal track code analyzer system32US 5,358,202 AConsolidated Rail Corporation · 1994
- Multi-channel signal decoder27US 4,015,082 AWestinghouse Electric Corp. · 1977
- Railway cab signal26US 5,330,134 AUnion Switch & Signal Inc. · 1994