H05B 41/2887
Characterised by a controllable bridge in the final stage
Official title: {characterised by a controllable bridge in the final stage}
H05B41/2887 (Characterised by a controllable bridge in the final stage) appears on 249 US grants and 200 published applications in this corpus.
Search patents in H05B- Granted patents
- 249
- Published applications
- 200
- Assignees
- 94
- Inventors
- 378
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 7 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 9 | 0 |
| 2001 | 15 | 2 |
| 2002 | 9 | 14 |
| 2003 | 16 | 8 |
| 2004 | 8 | 8 |
| 2005 | 4 | 12 |
| 2006 | 10 | 13 |
| 2007 | 10 | 5 |
| 2008 | 7 | 14 |
| 2009 | 6 | 9 |
| 2010 | 4 | 17 |
| 2011 | 11 | 17 |
| 2012 | 15 | 15 |
| 2013 | 13 | 10 |
| 2014 | 16 | 9 |
| 2015 | 7 | 8 |
| 2016 | 9 | 12 |
| 2017 | 11 | 11 |
| 2018 | 11 | 6 |
| 2019 | 8 | 7 |
| 2020 | 3 | 1 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for operating a discharge lamp and discharge lamp9 Jun 2026US 12,650,637 B2OSRAM GmbH
- 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 method19 May 2020US 10,660,171 B2Seiko Epson Corporation
- Method for operating a discharge lamp and discharge lamp9 Mar 2023US 2023/0071761 A1OSRAM GmbH
- Control method and control circuit of electronic ballast of gas discharge lamp (hid)1 Jul 2021US 2021/0204372 A1Shenzhen Number Energy Saving Corporation
- Electronic Ballast with Single Stage Circuit Structure22 Oct 2020US 2020/0337126 A1Shenzhen Number Energy Saving Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method27 Jun 2019US 2019/0196318 A1Seiko Epson Corporation
- Discharge lamp drive device, light source device, projector, and discharge lamp drive method27 Jun 2019US 2019/0199985 A1Seiko Epson Corporation
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
- Discharge lamp auxiliary circuit with dI/dt switching control68US 4,060,752 AGeneral Electric Company · 1977
- Lighting circuit for vehicular discharge lamp59US 5,212,428 AKoito Manufacturing Co., Ltd. · 1993