F21K 9/27
Retrofit light sources for lighting devices with two fittings for each light
Official title: Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
F21K9/27 (Retrofit light sources for lighting devices with two fittings for each light) appears on 1,414 US grants and 1,748 published applications in this corpus.
Search patents in F21K- Granted patents
- 1,414
- Published applications
- 1,748
- Assignees
- 493
- Inventors
- 2,299
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2002 | 0 | 2 |
| 2003 | 0 | 3 |
| 2004 | 1 | 7 |
| 2005 | 4 | 7 |
| 2006 | 8 | 2 |
| 2007 | 3 | 13 |
| 2008 | 4 | 17 |
| 2009 | 18 | 26 |
| 2010 | 12 | 91 |
| 2011 | 29 | 96 |
| 2012 | 42 | 124 |
| 2013 | 81 | 136 |
| 2014 | 81 | 134 |
| 2015 | 102 | 158 |
| 2016 | 129 | 170 |
| 2017 | 159 | 168 |
| 2018 | 147 | 141 |
| 2019 | 168 | 136 |
| 2020 | 120 | 112 |
| 2021 | 99 | 67 |
| 2022 | 68 | 37 |
| 2023 | 52 | 30 |
| 2024 | 45 | 37 |
| 2025 | 26 | 20 |
| 2026 | 16 | 14 |
By publication year. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- LED lamp and misuse warning module thereof29 Sep 2026US 12,747,836 B2Jiaxing Super Lighting Electric Appliance Co., Ltd
- LED tube lamp4 Aug 2026US 12,698,871 B2Jiaxing Super Lighting Electric Appliance Co., Ltd
- LED lighting device4 Aug 2026US 12,698,872 B2Xiamen PVTECH Co., Ltd.
- Adaptor device and lamp assembly using the same21 Jul 2026US 12,687,264 B2Jiaxing Super Lighting Electric Appliance Co., Ltd
- LED lamp, integrated circuit and power supply module thereof21 Jul 2026US 12,687,265 B2Jiaxing Super Lighting Electric Appliance Co., Ltd
- Emergency lighting device with detachable end caps20 Aug 2026US 2026/0243396 A1Xiamen PVTECH Co., Ltd.
- Led tube lamp20 Aug 2026US 2026/0243397 A1Jiaxing Super Lighting Electric Appliance Co., Ltd
- Led lamp and led product16 Jul 2026US 2026/0202045 A1Guangdong Opsco Technology Co., Ltd
- Lighting fixtures having a rotatable illuminable assembly and methods for providing illumination9 Jul 2026US 2026/0194193 A1Wangs Alliance Corporation
- Plug-in tube lamp18 Jun 2026US 2026/0168631 A1Ledvance Lighting Co., Ltd.
Most cited
By later US patents
- LED replacement for fluorescent lighting371US 6,860,628 B22005
- LED retrofit lamp317US 6,853,151 B2DeNovo Lighting, LLC · 2005
- Retrofit LED lamp for fluorescent fixtures without ballast310US 7,507,001 B2DeNovo Lighting, LLC · 2009
- Light tube and power supply circuit300US 7,049,761 B2Altair Engineering, Inc. · 2006
- Tubular housing with light emitting diodes273US 6,762,562 B2DeNovo Lighting, LLC · 2004