F21L 4/00
Electric lighting devices with self-contained electric batteries or cells
F21L4/00 (Electric lighting devices with self-contained electric batteries or cells) appears on 3,550 US grants and 3,617 published applications in this corpus.
Search patents in F21L- Granted patents
- 3,550
- Published applications
- 3,617
- Assignees
- 1,192
- Inventors
- 4,622
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 12 | 0 |
| 1977 | 7 | 0 |
| 1978 | 8 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 9 | 0 |
| 1982 | 13 | 0 |
| 1983 | 9 | 0 |
| 1984 | 14 | 0 |
| 1985 | 23 | 0 |
| 1986 | 16 | 0 |
| 1987 | 15 | 0 |
| 1988 | 18 | 0 |
| 1989 | 23 | 0 |
| 1990 | 20 | 0 |
| 1991 | 23 | 0 |
| 1992 | 31 | 0 |
| 1993 | 25 | 0 |
| 1994 | 21 | 0 |
| 1995 | 31 | 0 |
| 1996 | 25 | 0 |
| 1997 | 29 | 0 |
| 1998 | 32 | 0 |
| 1999 | 30 | 0 |
| 2000 | 39 | 0 |
| 2001 | 61 | 23 |
| 2002 | 60 | 62 |
| 2003 | 71 | 82 |
| 2004 | 72 | 117 |
| 2005 | 76 | 150 |
| 2006 | 104 | 146 |
| 2007 | 84 | 138 |
| 2008 | 68 | 116 |
| 2009 | 77 | 144 |
| 2010 | 100 | 153 |
| 2011 | 78 | 135 |
| 2012 | 95 | 145 |
| 2013 | 125 | 173 |
| 2014 | 127 | 161 |
| 2015 | 153 | 211 |
| 2016 | 146 | 181 |
| 2017 | 162 | 196 |
| 2018 | 174 | 202 |
| 2019 | 213 | 171 |
| 2020 | 183 | 157 |
| 2021 | 172 | 159 |
| 2022 | 157 | 136 |
| 2023 | 142 | 145 |
| 2024 | 151 | 106 |
| 2025 | 133 | 128 |
| 2026 | 82 | 80 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F21L 4/02Electric lighting devices with self-contained electric batteries or cells: characterised by the1,237
- F21L 4/005The device being a pocket lamp842
- F21L 4/08Electric lighting devices with self-contained electric batteries or cells: characterised by means812
- F21L 4/04Electric lighting devices with self-contained electric batteries or cells: characterised by the587
- F21L 4/06Electric lighting devices with self-contained electric batteries or cells: with the light64
Recent patents
- Caulk nozzle lighting system6 Oct 2026US 12,752,298 B2
- Dual-stage flashlight switch and flashlight6 Oct 2026US 12,753,912 B1
- Work light29 Sep 2026US 12,747,854 B2Milwaukee Electric Tool Corporation
- Scuba light with offset battery cases22 Sep 2026US 12,742,525 B1
- Portable charger for recreational flying objects and method of use22 Sep 2026US 12,742,526 B2
- Portable lighting device with a flexible and deployable led lighting element8 Oct 2026US 2026/0309287 A1Promier Products Inc.
- Illumination apparatus for medical instrument and medical instrument kit1 Oct 2026US 2026/0298421 A1Smtp Medical Co., Ltd.
- Handheld lighting device and related methods1 Oct 2026US 2026/0298455 A1Harbor Freight Tools USA, Inc.
- Personal signaling device1 Oct 2026US 2026/0301550 A1S&S Precision, LLC
- Multifunction portable illumination system24 Sep 2026US 2026/0287126 A1Immobileyes Inc.
Most cited
By later US patents
- Preparedness flashlight1,025US 7,780,309 B2Eveready Battery Company, Inc. · 2010
- Method and apparatus for an L.E.D. flashlight530US 6,095,661 APPT Vision, Inc. · 2000
- Light emitting diode based products315US 7,161,313 B2Color Kinetics Incorporated · 2007
- High power LED305US 6,541,800 B2Weldon Technologies, Inc. · 2003
- LED illumination apparatus and card-type LED illumination source287US 6,949,772 B2Matsushita Electric Industrial Co., Ltd. · 2005