H05B 41/2888
The bridge being commutated at low frequency
Official title: {the bridge being commutated at low frequency, e.g. 1kHz}
H05B41/2888 (The bridge being commutated at low frequency) appears on 112 US grants and 71 published applications in this corpus.
Search patents in H05B- Granted patents
- 112
- Published applications
- 71
- Assignees
- 50
- Inventors
- 192
- Latest grant
- 15 Mar 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 10 | 2 |
| 2002 | 7 | 8 |
| 2003 | 10 | 5 |
| 2004 | 6 | 5 |
| 2005 | 0 | 8 |
| 2006 | 7 | 6 |
| 2007 | 7 | 2 |
| 2008 | 5 | 4 |
| 2009 | 2 | 4 |
| 2010 | 0 | 4 |
| 2011 | 4 | 5 |
| 2012 | 3 | 5 |
| 2013 | 7 | 2 |
| 2014 | 2 | 1 |
| 2015 | 1 | 2 |
| 2016 | 2 | 2 |
| 2017 | 3 | 2 |
| 2018 | 1 | 0 |
| 2019 | 1 | 3 |
| 2020 | 0 | 0 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Control method and control circuit of electronic ballast of gas discharge lamp (HID)15 Mar 2022US 11,277,891 B2Shenzhen Number Energy Saving Corporation
- 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
- Projection device and method for projecting at least one image onto a projection surface11 Sep 2018US 10,073,335 B2OSRAM GmbH
- Control method and control circuit of electronic ballast of gas discharge lamp (hid)1 Jul 2021US 2021/0204372 A1Shenzhen Number Energy Saving 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
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method21 Mar 2019US 2019/0090334 A1Seiko Epson Corporation
- Projection device and method for projecting at least one image onto a projection surface19 Oct 2017US 2017/0299954 A1OSRAM GmbH
Most cited
By later US patents
- Discharge lamp driving106US 5,932,976 AMatsushita Electric Works R&D Laboratory, Inc. · 1999
- Buck-boost function type electronic ballast with bus capacitor current sensing81US 6,278,245 B1Philips Electronics North America Corporation · 2001
- Fixed frequency, variable duty cycle, square wave dimmer for high intensity gaseous discharge lamp70US 4,170,747 AEsquire, Inc. · 1979
- Lighting circuit for vehicular discharge lamp59US 5,212,428 AKoito Manufacturing Co., Ltd. · 1993
- High pressure lamp operating circuit with suppression of lamp flicker54US 5,608,294 AU. S. Philips Corporation · 1997