H05B 41/2928
For protecting the lamp against abnormal operating conditions
Official title: {for protecting the lamp against abnormal operating conditions}
H05B41/2928 (For protecting the lamp against abnormal operating conditions) appears on 387 US grants and 342 published applications in this corpus.
Search patents in H05B- Granted patents
- 387
- Published applications
- 342
- Assignees
- 115
- Inventors
- 569
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 8 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 12 | 0 |
| 2000 | 13 | 0 |
| 2001 | 11 | 3 |
| 2002 | 11 | 19 |
| 2003 | 16 | 20 |
| 2004 | 21 | 14 |
| 2005 | 18 | 21 |
| 2006 | 14 | 27 |
| 2007 | 11 | 23 |
| 2008 | 18 | 24 |
| 2009 | 13 | 34 |
| 2010 | 19 | 51 |
| 2011 | 25 | 24 |
| 2012 | 44 | 20 |
| 2013 | 25 | 17 |
| 2014 | 18 | 13 |
| 2015 | 16 | 9 |
| 2016 | 10 | 8 |
| 2017 | 8 | 6 |
| 2018 | 7 | 3 |
| 2019 | 4 | 4 |
| 2020 | 1 | 0 |
| 2021 | 2 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 2 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for operating a discharge lamp and discharge lamp9 Jun 2026US 12,650,637 B2OSRAM GmbH
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method27 Jul 2021US 11,076,457 B2Seiko Epson Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method16 Feb 2021US 10,925,127 B2Seiko Epson Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method19 May 2020US 10,660,171 B2Seiko Epson Corporation
- Lamp color temperature stability in an automated luminaire24 Sep 2019US 10,422,520 B2Robe Lighting s.r.o.
- Method for operating a discharge lamp and discharge lamp9 Mar 2023US 2023/0071761 A1OSRAM GmbH
- Method for operating a discharge lamp and discharge lamp2 Mar 2023US 2023/0063322 A1OSRAM GmbH
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method4 Apr 2019US 2019/0104602 A1Seiko Epson Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method21 Mar 2019US 2019/0090332 A1Seiko Epson Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method21 Mar 2019US 2019/0090333 A1Seiko Epson Corporation
Most cited
By later US patents
- High efficiency electronic ballast for high intensity discharge lamps121US 5,677,602 A1997
- Controlled power dissipation in a switch path in a lighting system57US 9,084,316 B2Cirrus Logic, Inc. · 2015
- Chopper ballast for gaseous discharge lamps with auxiliary capacitor energy storage56US 4,042,856 AGeneral Electric Company · 1977
- Controller for a gas discharge lamp with variable inverter frequency and with lamp power and bus voltage control56US 5,623,187 APhilips Electronics North America Corporation · 1997
- High pressure lamp operating circuit with suppression of lamp flicker54US 5,608,294 AU. S. Philips Corporation · 1997