H05B 47/20
Responsive to malfunctions or to light source life
Official title: Responsive to malfunctions or to light source life; for protection
H05B47/20 (Responsive to malfunctions or to light source life) appears on 1,777 US grants and 1,874 published applications in this corpus.
Search patents in H05B- Granted patents
- 1,777
- Published applications
- 1,874
- Assignees
- 841
- Inventors
- 3,363
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 4 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 6 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 6 | 0 |
| 1989 | 8 | 0 |
| 1990 | 8 | 0 |
| 1991 | 7 | 0 |
| 1992 | 10 | 0 |
| 1993 | 7 | 0 |
| 1994 | 4 | 0 |
| 1995 | 12 | 0 |
| 1996 | 5 | 0 |
| 1997 | 9 | 0 |
| 1998 | 9 | 0 |
| 1999 | 14 | 0 |
| 2000 | 19 | 0 |
| 2001 | 12 | 8 |
| 2002 | 40 | 34 |
| 2003 | 22 | 30 |
| 2004 | 28 | 37 |
| 2005 | 21 | 40 |
| 2006 | 25 | 41 |
| 2007 | 27 | 50 |
| 2008 | 25 | 46 |
| 2009 | 31 | 45 |
| 2010 | 32 | 55 |
| 2011 | 30 | 59 |
| 2012 | 52 | 72 |
| 2013 | 50 | 114 |
| 2014 | 74 | 113 |
| 2015 | 107 | 120 |
| 2016 | 138 | 131 |
| 2017 | 125 | 135 |
| 2018 | 126 | 123 |
| 2019 | 154 | 104 |
| 2020 | 96 | 106 |
| 2021 | 92 | 83 |
| 2022 | 92 | 90 |
| 2023 | 75 | 70 |
| 2024 | 57 | 62 |
| 2025 | 60 | 57 |
| 2026 | 39 | 49 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H05B 47/21Of two or more light sources connected in parallel335
- H05B 47/24Circuit arrangements for protecting against overvoltage312
- H05B 47/25Circuit arrangements for protecting against overcurrent277
- H05B 47/23Of two or more light sources connected in series173
- H05B 47/26Circuit arrangements for protecting against earth faults145
- H05B 47/28Circuit arrangements for protecting against abnormal temperature141
- H05B 47/29Circuits providing for substitution of the light source in case of its95
Recent patents
- Illumination device and method for calibrating an illumination device over changes in temperature, drive current, and time6 Oct 2026US 12,757,304 B2Lutron Technology Company LLC
- Light tube circuit for switching between emergency lighting and general lighting15 Sep 2026US 12,739,959 B2Shenzhen Billda Technology Co., Ltd
- Dimming power supply8 Sep 2026US 12,733,084 B2Zhuhai Shengchang Electronics Co., Ltd.
- Light source drive system and failure reporting method thereof1 Sep 2026US 12,727,070 B2Anpec Electronics Corporation
- Bidirectional illuminated LED bead triggered by power line pulse signals25 Aug 2026US 12,720,654 B2Hangzhou Yun Led Chip Photoelectricity Tech. Co., Ltd.
- Electrical wiring device with wiring detection and correction24 Sep 2026US 2026/0291223 A1Pass & Seymour, Inc.
- Techniques for Using Floodlight LEDs When Imaging Sensors Have an Insufficient Level of Detail for Identifying Hand Gestures, and Mixed-Reality Systems and Methods of Using These Techniques24 Sep 2026US 2026/0292120 A1Meta Platforms Technologies, LLC
- Lamp monitoring and control system and method10 Sep 2026US 2026/0271166 A1
- Current sink with bypass for an led chain27 Aug 2026US 2026/0255455 A1Diehl Aerospace GmbH
- Current sink with parallel load for an led chain27 Aug 2026US 2026/0255457 A1Diehl Aerospace GmbH
Most cited
By later US patents
- Resetting an electronic ballast in the event of fault525US 8,004,198 B2Osram Sylvania Inc. · 2011
- Inductively coupled ballast circuit436US 6,825,620 B2Access Business Group International LLC · 2004
- Water treatment system with an inductively coupled ballast432US 6,436,299 B1Amway Corporation · 2002
- Adaptive inductive power supply393US 7,212,414 B2Access Business Group International LLC · 2007
- Inductively powered lamp assembly370US 6,731,071 B2Access Business Group International LLC · 2004