H01F 38/10
Ballasts
Official title: Ballasts, e.g. for discharge lamps
H01F38/10 (Ballasts) appears on 183 US grants and 169 published applications in this corpus.
Search patents in H01F- Granted patents
- 183
- Published applications
- 169
- Assignees
- 96
- Inventors
- 334
- Latest grant
- 30 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 5 | 0 |
| 1989 | 2 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 5 |
| 2003 | 3 | 5 |
| 2004 | 4 | 10 |
| 2005 | 7 | 14 |
| 2006 | 11 | 11 |
| 2007 | 11 | 28 |
| 2008 | 17 | 26 |
| 2009 | 7 | 19 |
| 2010 | 17 | 15 |
| 2011 | 12 | 6 |
| 2012 | 11 | 3 |
| 2013 | 2 | 1 |
| 2014 | 2 | 6 |
| 2015 | 2 | 1 |
| 2016 | 3 | 2 |
| 2017 | 3 | 3 |
| 2018 | 2 | 2 |
| 2019 | 1 | 2 |
| 2020 | 2 | 0 |
| 2021 | 2 | 4 |
| 2022 | 1 | 0 |
| 2023 | 3 | 3 |
| 2024 | 1 | 1 |
| 2025 | 2 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Waveform detection of states and faults in plasma inverters30 Sep 2025US 12,432,842 B2Atmospheric Plasma Solutions, Inc.
- Asymmetrical ballast transformer13 May 2025US 12,302,486 B2Atmospheric Plasma Solutions, Inc.
- Waveform detection of states and faults in plasma inverters30 Apr 2024US 11,974,385 B2Atmospheric Plasma Solutions, Inc.
- Lamp comprising multiple component designs and constructions22 Aug 2023US 11,735,409 B2Teslo Pty Ltd
- Asymmetrical ballast transformer18 Jul 2023US 11,706,866 B2Atmospheric Plasma Solutions, Inc.
- Multi-chamber transformer and mounting assembly4 Sep 2025US 2025/0279235 A1Inventronics, Inc.
- Magnetically coupled inductor and method of assembling the same1 May 2025US 2025/0140460 A1Sumida Corporation
- Waveform detection of states and faults in plasma inverters17 Oct 2024US 2024/0349417 A1Atmospheric Plasma Solutions, Inc.
- Waveform detection of states and faults in plasma inverters9 Nov 2023US 2023/0363078 A1Atmospheric Plasma Solutions, Inc.
- Asymmetrical ballast transformer2 Nov 2023US 2023/0354500 A1Atmospheric Plasma Solutions, Inc.
Most cited
By later US patents
- Frequency modulated ballast with loosely coupled transformer for parallel gas discharge lamp control63US 6,181,066 B2Power Circuit Innovations, Inc. · 2001
- Integrated transformer and inductor61US 4,613,841 AGeneral Electric Company · 1986
- Combination equalizing transformer and ballast choke52US 6,323,602 B1U. S. Philips Corporation · 2001
- Controlled leakage transformer for fluorescent lamp ballast including integral ballasting inductor51US 4,902,942 AGeneral Electric Company · 1990
- Electrical connector with improved centering of mating terminal pins, for a fluorescent-lighting ballast45US 5,488,268 AMagneTek, Inc. · 1996