B61L 5/1809
Daylight signals
Official title: {Daylight signals}
B61L5/1809 (Daylight signals) appears on 116 US grants and 112 published applications in this corpus.
Search patents in B61L- Granted patents
- 116
- Published applications
- 112
- Assignees
- 77
- Inventors
- 247
- Latest grant
- 29 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 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 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 5 |
| 2003 | 5 | 5 |
| 2004 | 3 | 3 |
| 2005 | 2 | 7 |
| 2006 | 5 | 6 |
| 2007 | 1 | 3 |
| 2008 | 2 | 7 |
| 2009 | 3 | 1 |
| 2010 | 5 | 2 |
| 2011 | 2 | 2 |
| 2012 | 1 | 5 |
| 2013 | 2 | 3 |
| 2014 | 2 | 8 |
| 2015 | 7 | 8 |
| 2016 | 4 | 7 |
| 2017 | 10 | 5 |
| 2018 | 4 | 6 |
| 2019 | 6 | 5 |
| 2020 | 3 | 5 |
| 2021 | 5 | 6 |
| 2022 | 5 | 1 |
| 2023 | 4 | 2 |
| 2024 | 3 | 8 |
| 2025 | 5 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
- B61L 5/1881Wiring diagrams for power supply, control or testing57
- B61L 5/1854Mounting and focussing of the light source in a lamp, fixing means24
- B61L 5/1827Using light sources of different colours and a common optical system21
- B61L 5/1845Optical systems, lenses18
- B61L 5/1863Lamp mountings on a mast12
- B61L 5/1836Using light sources of different colours and separate optical systems8
- B61L 5/1872Mobile mounting arrangements on a mast8
- B61L 5/1818Using mobile coloured screen2
Recent patents
- System and method for railroad smart flasher lamps29 Jul 2025US 12,376,212 B2BNSF Railway Company
- Systems and methods for visual inspection of signal lights at railroad crossings8 Jul 2025US 12,354,376 B2Siemens Mobility GmbH
- System for securing communication between central controller and signaling devices in traffic signaling networks11 Mar 2025US 12,246,765 B2Tata Consultancy Services Limited
- Method for ensuring signal light integrity and viewability14 Jan 2025US 12,195,066 B2Tektracking, LLC
- Light-out detection for wayside signals14 Jan 2025US 12,196,608 B2Siemens Mobility GmbH
- System and method for railroad smart flasher lamps20 Nov 2025US 2025/0358915 A1BNSF Railway Company
- Derail Warning Light System3 Jul 2025US 2025/0214634 A1Railserve, Inc.
- System for securing communication between central controller and signaling devices in traffic signaling networks26 Dec 2024US 2024/0425094 A1Tata Consultancy Services Limited
- Light-out detection for wayside signals28 Nov 2024US 2024/0393168 A1Siemens Mobility GmbH
- Rail signal14 Nov 2024US 2024/0375694 A1Unipart Rail Limited
Most cited
By later US patents
- LED lamp assembly with means to conduct heat away from the LEDS470US 6,045,240 ARelume Corporation · 2000
- Signal light unit having heat dissipating function456US 4,729,076 A1988
- Thermally protected LED array337US 5,785,418 A1998
- Circuit for interfacing between a conventional traffic signal conflict monitor and light emitting diodes replacing a conventional incandescent bulb in the signal204US 6,150,771 APrecision Solar Controls Inc. · 2000
- Light degradation sensing LED signal with light pipe collector113US 6,717,526 B2GELcore, LLC · 2004