H05B 41/3925
By frequency variation
Official title: {by frequency variation (H05B41/3922 takes precedence)}
H05B41/3925 (By frequency variation) appears on 329 US grants and 149 published applications in this corpus.
Search patents in H05B- Granted patents
- 329
- Published applications
- 149
- Assignees
- 134
- Inventors
- 434
- Latest grant
- 4 Jul 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 16 | 0 |
| 1993 | 12 | 0 |
| 1994 | 7 | 0 |
| 1995 | 23 | 0 |
| 1996 | 13 | 0 |
| 1997 | 12 | 0 |
| 1998 | 17 | 0 |
| 1999 | 19 | 0 |
| 2000 | 23 | 0 |
| 2001 | 24 | 1 |
| 2002 | 14 | 15 |
| 2003 | 13 | 7 |
| 2004 | 13 | 15 |
| 2005 | 8 | 15 |
| 2006 | 10 | 11 |
| 2007 | 13 | 7 |
| 2008 | 9 | 15 |
| 2009 | 5 | 13 |
| 2010 | 7 | 20 |
| 2011 | 12 | 10 |
| 2012 | 12 | 6 |
| 2013 | 7 | 1 |
| 2014 | 6 | 4 |
| 2015 | 3 | 1 |
| 2016 | 2 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 3 |
| 2019 | 0 | 1 |
| 2020 | 1 | 1 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and apparatus for determining a target light intensity from a phase-control signal4 Jul 2023US 11,696,379 B2Lutron Technology Company LLC
- Method and apparatus for determining a target light intensity from a phase-control signal1 Nov 2022US 11,490,475 B2Lutron Technology Company LLC
- Light emission control device, light source device, and projection-type video display device6 Jul 2021US 11,057,594 B2Seiko Epson Corporation
- Measurement assembly and positioning system26 Jan 2021US 10,901,427 B2Boe Technology Group Co., Ltd.
- Method and apparatus for determining a target light intensity from a phase-control signal13 Oct 2020US 10,805,994 B2Lutron Technology Company LLC
- Method and Apparatus for Determining a Target Light Intensity From a Phase-Control Signal9 Feb 2023US 2023/0038540 A1Lutron Technology Company LLC
- Method and Apparatus for Determining a Target Light Intensity From a Phase-Control Signal28 Jan 2021US 2021/0029790 A1Lutron Technology Company LLC
- Light emission control device, light source device, and projection-type video display device26 Nov 2020US 2020/0374494 A1Seiko Epson Corporation
- Measurement assembly and positioning system31 Jan 2019US 2019/0033878 A1Boe Technology Group Co., Ltd.
- Method and Apparatus for Determining a Target Light Intensity From a Phase-Control Signal27 Dec 2018US 2018/0376573 A1Lutron Electronics Co., Inc.
Most cited
By later US patents
- Current synchronous zero voltage switching resonant topology223US 5,615,093 ALinfinity Microelectronics · 1997
- Fluorescent-lamp excitation circuit using a piezoelectric acoustic transformer and methods for using same120US 5,548,189 ALinear Technology Corporation · 1996
- Electronic dimming ballast101US 6,452,344 B1Lutron Electronics Co., Inc. · 2002
- Power control circuit for discharge lamp and method of operating same99US 4,928,038 AGeneral Electric Company · 1990
- Control circuit for piezo transformer based fluorescent lamp power supplies96US 6,400,096 B1Texas Instruments Incorporated · 2002