H05B 41/3921
With possibility of light intensity variations
Official title: {with possibility of light intensity variations}
H05B41/3921 (With possibility of light intensity variations) appears on 1,484 US grants and 904 published applications in this corpus.
Search patents in H05B- Granted patents
- 1,484
- Published applications
- 904
- Assignees
- 560
- Inventors
- 1,953
- Latest grant
- 22 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 9 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 8 | 0 |
| 1981 | 6 | 0 |
| 1982 | 9 | 0 |
| 1983 | 13 | 0 |
| 1984 | 11 | 0 |
| 1985 | 14 | 0 |
| 1986 | 6 | 0 |
| 1987 | 16 | 0 |
| 1988 | 6 | 0 |
| 1989 | 16 | 0 |
| 1990 | 24 | 0 |
| 1991 | 36 | 0 |
| 1992 | 29 | 0 |
| 1993 | 28 | 0 |
| 1994 | 21 | 0 |
| 1995 | 48 | 0 |
| 1996 | 46 | 0 |
| 1997 | 42 | 0 |
| 1998 | 54 | 0 |
| 1999 | 53 | 0 |
| 2000 | 72 | 0 |
| 2001 | 72 | 7 |
| 2002 | 62 | 64 |
| 2003 | 58 | 40 |
| 2004 | 48 | 72 |
| 2005 | 49 | 76 |
| 2006 | 53 | 78 |
| 2007 | 52 | 56 |
| 2008 | 64 | 93 |
| 2009 | 39 | 77 |
| 2010 | 52 | 87 |
| 2011 | 61 | 50 |
| 2012 | 71 | 35 |
| 2013 | 49 | 32 |
| 2014 | 32 | 29 |
| 2015 | 32 | 21 |
| 2016 | 28 | 18 |
| 2017 | 15 | 12 |
| 2018 | 20 | 15 |
| 2019 | 6 | 15 |
| 2020 | 15 | 12 |
| 2021 | 6 | 5 |
| 2022 | 4 | 1 |
| 2023 | 4 | 3 |
| 2024 | 3 | 3 |
| 2025 | 3 | 3 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Load control device for high-efficiency loads22 Jul 2025US 12,369,233 B2Lutron Technology Company LLC
- Intense pulse light (IPL) apparatus utilizing a pulse forming network (PFN)25 Mar 2025US 12,257,449 B2
- Load control device having a closed-loop gate drive circuit including overcurrent protection25 Mar 2025US 12,261,521 B2Lutron Technology Company LLC
- Excimer lamp and excimer lamp device26 Nov 2024US 12,154,782 B2Ushio Denki Kabushiki Kaisha
- Load control device for high-efficiency loads21 May 2024US 11,991,796 B2Lutron Technology Company LLC
- Load Control Device for High-Efficiency Loads9 Oct 2025US 2025/0318027 A1Lutron Technology Company LLC
- Intense pulse light (ipl) apparatus utilizing a pulse forming network (pfn)22 May 2025US 2025/0161708 A1
- Load control device having a closed-loop gate drive circuit including overcurrent protection22 May 2025US 2025/0167666 A1Lutron Technology Company LLC
- Excimer lamp and excimer lamp device29 Aug 2024US 2024/0290606 A1Ushio Denki Kabushiki Kaisha
- Load control device having a closed-loop gate drive circuit including overcurrent protection11 Apr 2024US 2024/0120829 A1Lutron Technology Company LLC
Most cited
By later US patents
- Universal ballast control circuit611US 6,137,240 ALumion Corporation · 2000
- Methods and systems for dimmable fluorescent lighting using multiple frequencies524US 8,138,676 B22012
- Network based multiple sensor and control device with temperature sensing and control499US 6,798,341 B1Leviton Manufacturing Co., Inc. · 2004
- Energy management control system354US 5,962,989 ANegawatt Technologies Inc. · 1999
- Network based electrical control system with distributed sensing and control333US 6,388,399 B1Leviton Manufacturing Co., Inc. · 2002