F21K 9/23
Retrofit light sources for lighting devices with a single fitting for each
Official title: Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
F21K9/23 (Retrofit light sources for lighting devices with a single fitting for each) appears on 4,306 US grants and 5,406 published applications in this corpus.
Search patents in F21K- Granted patents
- 4,306
- Published applications
- 5,406
- Assignees
- 1,289
- Inventors
- 5,669
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 5 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 8 | 0 |
| 1999 | 5 | 0 |
| 2000 | 3 | 0 |
| 2001 | 13 | 4 |
| 2002 | 13 | 24 |
| 2003 | 19 | 33 |
| 2004 | 30 | 45 |
| 2005 | 22 | 55 |
| 2006 | 26 | 46 |
| 2007 | 28 | 63 |
| 2008 | 34 | 73 |
| 2009 | 44 | 122 |
| 2010 | 68 | 237 |
| 2011 | 105 | 395 |
| 2012 | 193 | 479 |
| 2013 | 311 | 532 |
| 2014 | 352 | 498 |
| 2015 | 334 | 403 |
| 2016 | 342 | 359 |
| 2017 | 335 | 289 |
| 2018 | 297 | 326 |
| 2019 | 358 | 314 |
| 2020 | 341 | 289 |
| 2021 | 260 | 195 |
| 2022 | 201 | 168 |
| 2023 | 178 | 163 |
| 2024 | 173 | 133 |
| 2025 | 134 | 89 |
| 2026 | 57 | 72 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F21K 9/232Specially adapted for generating an essentially omnidirectional light distribution2,477
- F21K 9/238Arrangement or mounting of circuit elements integrated in the light source1,075
- F21K 9/235Details of bases or caps, i.e. the parts that connect the light623
- F21K 9/233Specially adapted for generating a spot light distribution622
- F21K 9/237Details of housings or cases, i.e. the parts between the light-generating element527
Recent patents
- Emitter assembly for a lighting device6 Oct 2026US 12,753,886 B2Lutron Technology Company LLC
- LED filament and a lamp29 Sep 2026US 12,747,840 B2Signify Holding B. V.
- LED lamp29 Sep 2026US 12,747,856 B2Jiaxing Super Lighting Electric Appliance Co., Ltd
- Control circuit of flame lamp and flame lamp29 Sep 2026US 12,750,935 B1Guangzhou Xushen Technology Co., Ltd.
- LED light for microwave ovens22 Sep 2026US 12,742,524 B1Long Yan De Yu Lighting Co., Ltd.
- Lighting element with insect repelling element8 Oct 2026US 2026/0305598 A1PIC Corporation
- Wireless controllable lighting device8 Oct 2026US 2026/0309313 A1Lutron Technology Company LLC
- Solid State Lamp Using Light Emitting Strips1 Oct 2026US 2026/0298419 A1Quarkstar LLC
- Led filament and light bulb using the same1 Oct 2026US 2026/0298420 A1Jiaxing Super Lighting Electric Appliance Co., Ltd
- Led filament and led filament lamp24 Sep 2026US 2026/0287154 A1Signify Holding B. V.
Most cited
By later US patents
- Illumination components1,698US 6,211,626 B1Color Kinetics Incorporated · 2001
- Precision illumination methods and systems780US 6,459,919 B1Color Kinetics Incorporated · 2002
- Methods and apparatus for providing power to lighting devices771US 7,038,399 B2Color Kinetics Incorporated · 2006
- Power/data protocol747US 6,292,901 B1Color Kinetics Incorporated · 2001
- LED beacon light704US 5,806,965 AR & M Deese Inc. · 1998