H01F 27/385
For reducing harmonics
Official title: {for reducing harmonics}
H01F27/385 (For reducing harmonics) appears on 69 US grants and 80 published applications in this corpus.
Search patents in H01F- Granted patents
- 69
- Published applications
- 80
- Assignees
- 62
- Inventors
- 121
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 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 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 3 |
| 2005 | 2 | 5 |
| 2006 | 3 | 2 |
| 2007 | 5 | 2 |
| 2008 | 0 | 3 |
| 2009 | 2 | 3 |
| 2010 | 3 | 7 |
| 2011 | 3 | 1 |
| 2012 | 3 | 2 |
| 2013 | 1 | 0 |
| 2014 | 1 | 10 |
| 2015 | 0 | 3 |
| 2016 | 6 | 2 |
| 2017 | 4 | 2 |
| 2018 | 4 | 4 |
| 2019 | 4 | 4 |
| 2020 | 0 | 0 |
| 2021 | 2 | 7 |
| 2022 | 3 | 6 |
| 2023 | 5 | 4 |
| 2024 | 2 | 2 |
| 2025 | 6 | 3 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Synchronous rectification assembly, manufacturing method thereof and power supply18 Nov 2025US 12,476,554 B2Aplus Power Technology (Hangzhou) Co., Ltd.
- Power control apparatus and method11 Nov 2025US 12,470,067 B2Enoda Ltd.
- Waveform detection of states and faults in plasma inverters30 Sep 2025US 12,432,842 B2Atmospheric Plasma Solutions, Inc.
- Wound core19 Aug 2025US 12,394,552 B2Nippon Steel Corporation
- Electrical power transformation system and process15 Apr 2025US 12,278,042 B2Ionate Limited
- Electromagnetic interference filter20 Aug 2026US 2026/0246438 A1Lite-On Technology Corporation
- Resonant converter2 Apr 2026US 2026/0095092 A1Delta Electronics, Inc.
- Power Control Apparatus and Method26 Feb 2026US 2026/0058471 A1Enoda Ltd.
- Active power transformer for controlling non-uniform voltage23 Oct 2025US 2025/0329492 A1Jungin Techwin Co.,Ltd.
- Electrical power transformation system and process26 Jun 2025US 2025/0206741 A1Ionate Limited
Most cited
By later US patents
- Pre-charging an inverter using an auxiliary winding39US 8,223,515 B2TECO-Westinghouse Motor Company · 2012
- Harmonic filtering circuit with special transformer27US 6,856,230 B22005
- Magnetic integrated circuit for multiphase interleaved flyback converter and controlling method thereof26US 7,983,063 B2Delta Electrronics, Inc. · 2011
- Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components25US 6,549,431 B2Power Integrations, Inc. · 2003
- Device for reducing harmonics in three-phase poly-wire power lines25US 7,629,786 B22009