F21V 21/18
Operated by springs
Official title: operated by springs
F21V21/18 (Operated by springs) appears on 23 US grants and 19 published applications in this corpus.
Search patents in F21V- Granted patents
- 23
- Published applications
- 19
- Assignees
- 20
- Inventors
- 54
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 2 |
| 2013 | 2 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 2 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 1 |
| 2019 | 0 | 1 |
| 2020 | 4 | 3 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 2 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Height adjustable lamp3 Mar 2026US 12,565,986 B2Hatco Corporation
- LED mounting base, adjustment mechanism with LED mounting base and red dot sighting device with adjustment mechanism20 May 2025US 12,305,837 B2Huanic Corporation
- Height adjustable lamp8 Oct 2024US 12,111,041 B2Hatco Corporation
- Expandable icicle light string for spanning structures of various dimensions26 Mar 2024US 11,940,108 B1Seasons 4, Inc.
- Systems and methods for collapsible lighting fixtures8 Dec 2020US 10,859,246 B2Fluence Bioengineering, Inc.
- Work light30 Jul 2026US 2026/0218888 A1Streamlight, Inc.
- Height adjustable heatlamp18 Jun 2026US 2026/0168659 A1Hatco Corporation
- Height adjustable lamp2 Jan 2025US 2025/0003579 A1Hatco Corporation
- Height adjustable lamp11 Jul 2024US 2024/0230071 A1Hatco Corporation
- Led mounting base, adjustment mechanism with led mounting base and red dot sighting device with adjustment mechanism26 May 2022US 2022/0163289 A1Huanic Corporation
Most cited
By later US patents
- Adjustable height grow light76US 6,488,387 B2Hydrofarm, Inc. · 2002
- Wire holder37US 5,417,400 AArakawa & Co., Ltd. · 1995
- Extendible ceiling hook20US 4,556,184 A1985
- Up-and-down pulley device for suspension lamps and the like10US 4,300,732 AAromec S.r.l. · 1981
- Height adjustable plant hanging device10US 5,065,971 A1991