B61L 5/1845
Optical systems, lenses
Official title: {Optical systems, lenses}
B61L5/1845 (Optical systems, lenses) appears on 18 US grants and 18 published applications in this corpus.
Search patents in B61L- Granted patents
- 18
- Published applications
- 18
- Assignees
- 14
- Inventors
- 43
- Latest grant
- 15 Mar 2022
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 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 3 |
| 2003 | 1 | 0 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 1 |
| 2016 | 1 | 2 |
| 2017 | 1 | 0 |
| 2018 | 1 | 2 |
| 2019 | 2 | 2 |
| 2020 | 1 | 0 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- LED shielding and monitoring system and wayside LED signals15 Mar 2022US 11,273,855 B2Siemens Mobility GmbH
- Optical system for a LED signal and wayside LED signal26 Oct 2021US 11,155,285 B2Siemens Mobility GmbH
- Signal light assembly3 Aug 2021US 11,077,872 B2Siemens Mobility GmbH
- Light signal7 Jan 2020US 10,525,992 B2Siemens Mobility GmbH
- Light Signal25 Jun 2019US 10,328,958 B2Siemens Mobility GmbH
- Rail signal14 Nov 2024US 2024/0375694 A1Unipart Rail Limited
- Rail signal8 Aug 2024US 2024/0262398 A1Unipart Rail Limited
- Signal light assembly8 Jul 2021US 2021/0206404 A1Siemens Mobility GmbH
- Led shielding and monitoring system and wayside led signals31 Oct 2019US 2019/0329802 A1Siemens Industry, Inc.
- Optical system for a led signal and wayside led signal31 Oct 2019US 2019/0329803 A1Siemens Industry, Inc.
Most cited
By later US patents
- Light degradation sensing LED signal with light pipe collector113US 6,717,526 B2GELcore, LLC · 2004
- Led illuminated lamp assembly51US 5,833,355 ADialight Corporation · 1998
- Compact light emitting diode retrofit lamp and method for traffic signal lights47US 6,911,915 B2Leotek Electronics Corporation · 2005
- Sun phantom led traffic signal38US 6,509,840 B2GELcore, LLC · 2003
- Optical element for traffic signs, display panels or the like35US 6,249,375 B1Swarco Futurit Verkehrssignal Systeme Ges.M.B.H. · 2001