H05B 41/2921
For protecting the circuit against abnormal operating conditions
Official title: {for protecting the circuit against abnormal operating conditions}
H05B41/2921 (For protecting the circuit against abnormal operating conditions) appears on 243 US grants and 155 published applications in this corpus.
Search patents in H05B- Granted patents
- 243
- Published applications
- 155
- Assignees
- 118
- Inventors
- 379
- Latest grant
- 26 Apr 2022
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 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 5 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 5 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 5 | 0 |
| 1995 | 7 | 0 |
| 1996 | 6 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 14 | 0 |
| 2000 | 8 | 0 |
| 2001 | 13 | 1 |
| 2002 | 17 | 15 |
| 2003 | 18 | 13 |
| 2004 | 10 | 8 |
| 2005 | 10 | 18 |
| 2006 | 11 | 19 |
| 2007 | 12 | 11 |
| 2008 | 12 | 11 |
| 2009 | 8 | 11 |
| 2010 | 5 | 11 |
| 2011 | 8 | 11 |
| 2012 | 16 | 0 |
| 2013 | 7 | 10 |
| 2014 | 1 | 1 |
| 2015 | 6 | 2 |
| 2016 | 0 | 2 |
| 2017 | 3 | 3 |
| 2018 | 5 | 3 |
| 2019 | 2 | 3 |
| 2020 | 0 | 0 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Input detection and protection circuit26 Apr 2022US 11,317,490 B2Lumlux Corp.
- 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 method6 Aug 2019US 10,375,808 B2Seiko Epson Corporation
- Operating a ballast for a gas discharge lamp12 Feb 2019US 10,206,271 B2OSRAM GmbH
- A device with customized integrated electronic circuit for destroying pathogens20 Jun 2024US 2024/0197936 A1
- Input detection an protection circuit an ac electronic ballast for hid lamps15 Jul 2021US 2021/0219397 A1Lumlux Corp.
- 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
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method21 Mar 2019US 2019/0090334 A1Seiko Epson Corporation
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
- Ballast circuit and method for optimizing the operation of high intensity discharge lamps in the growing of plants61US 4,396,872 AGeneral Mills, Inc. · 1983
- Electronic high intensity discharge ballast57US 6,259,215 B1Romlight International, Inc. · 2001