H05B 41/2925
Against abnormal lamp operating conditions
Official title: {against abnormal lamp operating conditions}
H05B41/2925 (Against abnormal lamp operating conditions) appears on 141 US grants and 92 published applications in this corpus.
Search patents in H05B- Granted patents
- 141
- Published applications
- 92
- Assignees
- 83
- Inventors
- 248
- Latest grant
- 16 Feb 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 9 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 1 |
| 2002 | 11 | 9 |
| 2003 | 13 | 7 |
| 2004 | 5 | 5 |
| 2005 | 8 | 10 |
| 2006 | 5 | 10 |
| 2007 | 5 | 8 |
| 2008 | 5 | 7 |
| 2009 | 7 | 5 |
| 2010 | 3 | 8 |
| 2011 | 5 | 8 |
| 2012 | 13 | 0 |
| 2013 | 3 | 5 |
| 2014 | 1 | 1 |
| 2015 | 3 | 1 |
| 2016 | 0 | 1 |
| 2017 | 1 | 2 |
| 2018 | 3 | 2 |
| 2019 | 2 | 2 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- 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 method6 Aug 2019US 10,375,808 B2Seiko Epson Corporation
- Operating a ballast for a gas discharge lamp12 Feb 2019US 10,206,271 B2OSRAM GmbH
- High-pressure sodium lamp lighting device11 Dec 2018US 10,153,152 B2Iwasaki Electric Co., Ltd.
- Starting device for a CDM lamp and starting method for the same21 Aug 2018US 10,057,969 B2Guangzhou Triz Information Technology Ltd.
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method21 Mar 2019US 2019/0090333 A1Seiko Epson Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method21 Mar 2019US 2019/0090334 A1Seiko Epson Corporation
- Operating a ballast for a gas discharge lamp24 May 2018US 2018/0146534 A1OSRAM GmbH
- High-pressure sodium lamp lighting device26 Apr 2018US 2018/0114689 A1Iwasaki Electric Co., Ltd.
- Discharge lamp lighting device, lamp failure detection method, and projector10 Aug 2017US 2017/0231073 A1NEC Display Soilutions, Ltd.
Most cited
By later US patents
- High efficiency electronic ballast for high intensity discharge lamps121US 5,677,602 A1997
- Lamp brightness control circuit with ambient light compensation118US 5,581,158 AEtta Industries, Inc. · 1996
- Ballast circuit for high intensity discharge lamps64US 6,181,084 B2EG&G, Inc. · 2001
- Lamp lighting circuit with an overload protection capability53US 5,068,570 AKoito Manufacturing Co., Ltd. · 1991
- Discharge lamp igniting apparatus for performing a feedback control of a discharge lamp and the like47US 5,910,713 AMitsubishi Denki Kabushiki Kaisha · 1999