H05B 41/2881
Load circuits
Official title: {Load circuits; Control thereof}
H05B41/2881 (Load circuits) appears on 517 US grants and 390 published applications in this corpus.
Search patents in H05B- Granted patents
- 517
- Published applications
- 390
- Assignees
- 184
- Inventors
- 731
- Latest grant
- 7 Jan 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 6 | 0 |
| 1991 | 5 | 0 |
| 1992 | 10 | 0 |
| 1993 | 6 | 0 |
| 1994 | 8 | 0 |
| 1995 | 11 | 0 |
| 1996 | 20 | 0 |
| 1997 | 10 | 0 |
| 1998 | 15 | 0 |
| 1999 | 12 | 0 |
| 2000 | 28 | 0 |
| 2001 | 24 | 3 |
| 2002 | 21 | 26 |
| 2003 | 28 | 24 |
| 2004 | 20 | 25 |
| 2005 | 22 | 35 |
| 2006 | 27 | 40 |
| 2007 | 25 | 29 |
| 2008 | 24 | 43 |
| 2009 | 23 | 42 |
| 2010 | 23 | 43 |
| 2011 | 33 | 30 |
| 2012 | 38 | 14 |
| 2013 | 23 | 8 |
| 2014 | 8 | 11 |
| 2015 | 12 | 5 |
| 2016 | 8 | 4 |
| 2017 | 4 | 4 |
| 2018 | 6 | 3 |
| 2019 | 3 | 1 |
| 2020 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method7 Jan 2020US 10,527,917 B2Seiko Epson Corporation
- Lamp color temperature stability in an automated luminaire24 Sep 2019US 10,422,520 B2Robe Lighting s.r.o.
- DC distribution connection device20 Aug 2019US 10,390,416 B2SMK Corporation
- Discharge lamp driver, light source, projector, and method of driving discharge lamp5 Feb 2019US 10,197,899 B2Seiko Epson Corporation
- Discharge lamp driving device, projector, and discharge lamp driving method11 Sep 2018US 10,076,018 B2Seiko Epson Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method27 Jun 2019US 2019/0196318 A1Seiko Epson Corporation
- Improved lamp color temperature stability in an automated luminaire31 May 2018US 2018/0149347 A1Robe Lighting
- Discharge lamp driver, light source, projector, and method of driving discharge lamp10 May 2018US 2018/0129128 A1Seiko Epson Corporation
- Dc distribution connection device12 Apr 2018US 2018/0103530 A1SMK Corporation
- Light attenuation controlling apparatus and method for a cdm lamp27 Jul 2017US 2017/0215262 A1
Most cited
By later US patents
- High efficiency electronic ballast for high intensity discharge lamps121US 5,677,602 A1997
- Discharge lamp driving106US 5,932,976 AMatsushita Electric Works R&D Laboratory, Inc. · 1999
- High voltage, low power transformer for efficiently firing a gas discharge luminous display103US 4,472,661 A1984
- Power control circuit for discharge lamp and method of operating same99US 4,928,038 AGeneral Electric Company · 1990
- Discharge lamp auxiliary circuit with dI/dt switching control68US 4,060,752 AGeneral Electric Company · 1977