H05B 41/3927
By pulse width modulation
Official title: {by pulse width modulation (H05B41/3922 takes precedence)}
H05B41/3927 (By pulse width modulation) appears on 586 US grants and 398 published applications in this corpus.
Search patents in H05B- Granted patents
- 586
- Published applications
- 398
- Assignees
- 296
- Inventors
- 867
- Latest grant
- 30 Aug 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 5 | 0 |
| 1988 | 0 | 0 |
| 1989 | 7 | 0 |
| 1990 | 8 | 0 |
| 1991 | 18 | 0 |
| 1992 | 11 | 0 |
| 1993 | 6 | 0 |
| 1994 | 7 | 0 |
| 1995 | 11 | 0 |
| 1996 | 19 | 0 |
| 1997 | 13 | 0 |
| 1998 | 17 | 0 |
| 1999 | 19 | 0 |
| 2000 | 25 | 0 |
| 2001 | 23 | 3 |
| 2002 | 31 | 19 |
| 2003 | 19 | 19 |
| 2004 | 23 | 43 |
| 2005 | 30 | 33 |
| 2006 | 27 | 44 |
| 2007 | 21 | 33 |
| 2008 | 39 | 51 |
| 2009 | 25 | 36 |
| 2010 | 27 | 31 |
| 2011 | 33 | 18 |
| 2012 | 31 | 8 |
| 2013 | 14 | 19 |
| 2014 | 12 | 7 |
| 2015 | 9 | 9 |
| 2016 | 11 | 4 |
| 2017 | 5 | 6 |
| 2018 | 9 | 3 |
| 2019 | 1 | 6 |
| 2020 | 5 | 3 |
| 2021 | 1 | 2 |
| 2022 | 2 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- High-dimming-ratio avionics display30 Aug 2022US 11,428,940 B2Garmin International, Inc.
- Control method and control circuit of electronic ballast of gas discharge lamp (HID)15 Mar 2022US 11,277,891 B2Shenzhen Number Energy Saving Corporation
- Light emission control device, light source device, and projection-type video display apparatus8 Jun 2021US 11,032,880 B2Seiko Epson Corporation
- Segmental driving of light emitting circuits6 Oct 2020US 10,798,795 B2Signify Holding B. V.
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method19 May 2020US 10,660,171 B2Seiko Epson Corporation
- High-dimming-ratio avionics display17 Nov 2022US 2022/0365350 A1Garmin International, Inc.
- High-dimming-ratio avionics display7 Oct 2021US 2021/0311309 A1Garmin International, Inc.
- Control method and control circuit of electronic ballast of gas discharge lamp (hid)1 Jul 2021US 2021/0204372 A1Shenzhen Number Energy Saving Corporation
- Light emission control device, light source device, and projection-type video display apparatus24 Sep 2020US 2020/0305245 A1Seiko Epson Corporation
- Fast start dimmable rf induction lamp19 Mar 2020US 2020/0090922 A1Lucidity Lights, Inc.
Most cited
By later US patents
- Dimming method and device for fluorescent lamps used for backlighting of liquid crystal screens212US 5,105,127 AThomson-CSF · 1992
- Tricolor fluorescent lamp195US 4,625,152 AMatsushita Electric Works, Ltd. · 1986
- Liquid crystal display with back-light control function180US 5,844,540 ASharp Kabushiki Kaisha · 1998
- DC-AC converter, controller IC therefor, and electronic apparatus utilizing such DC-AC converter180US 7,466,566 B2Rohm Co., Ltd. · 2008
- Circuit for dimming gas discharge lamps without introducing striations179US 5,001,386 ALutron Electronics Co., Inc. · 1991