H01F 27/289
With auxiliary windings
Official title: {with auxiliary windings (for pancake coils H01F27/2871)}
H01F27/289 (With auxiliary windings) appears on 77 US grants and 94 published applications in this corpus.
Search patents in H01F- Granted patents
- 77
- Published applications
- 94
- Assignees
- 65
- Inventors
- 186
- Latest grant
- 7 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 4 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 2 |
| 2005 | 0 | 0 |
| 2006 | 2 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 3 |
| 2009 | 2 | 1 |
| 2010 | 2 | 2 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 1 | 3 |
| 2014 | 1 | 2 |
| 2015 | 3 | 2 |
| 2016 | 1 | 6 |
| 2017 | 7 | 7 |
| 2018 | 3 | 3 |
| 2019 | 2 | 5 |
| 2020 | 6 | 17 |
| 2021 | 8 | 9 |
| 2022 | 10 | 12 |
| 2023 | 8 | 6 |
| 2024 | 8 | 6 |
| 2025 | 5 | 2 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Thermal management of transformer windings7 Apr 2026US 12,597,549 B2Murata Manufacturing Co., Ltd.
- Inductor skeleton structure, inductance device and luminaire21 Oct 2025US 12,451,285 B2Opple Lighting Co., Ltd.
- Planar transformer, power conversion circuit, and adapter1 Jul 2025US 12,347,601 B2Huawei Technologies Co., Ltd.
- Planar multilayer transformer with minimum noise injection in between primary and secondary winding3 Jun 2025US 12,322,535 B2Rompower Technology Holdings, LLC
- Transformer with interleaved shielding windings13 May 2025US 12,300,421 B2Silanna Asia Pte Ltd
- Low Common-Mode Noise Planar Transformer25 Jun 2026US 2026/0179831 A1National Instruments Corporation
- EMI Mitigation Features In Wireless Power Transmission Systems11 Jun 2026US 2026/0163411 A1NuCurrent, Inc.
- Inductive Wireless Power Transfer Device and System Using Same26 Feb 2026US 2026/0058494 A1
- Planar Multilayer Transformer With Minimum Noise Injection In Between Primary And Secondary Winding17 Apr 2025US 2025/0125079 A1Rompower Technology Holdings, LLC
- Integrated transformer-inductor and emi shield6 Feb 2025US 2025/0046512 A1
Most cited
By later US patents
- Transformer20US 4,335,423 ASony Corporation · 1982
- Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components without requiring additional windings10US 7,768,369 B2Power Integrations, Inc. · 2010
- Interleaved converters with integrated magnetics7US 10,790,081 B2Virginia Tech Intellectual Properties, Inc. · 2020
- Voltage regulating transformer7US 4,007,416 A1977
- Method of adjusting two concentric windings in electrical induction devices7US 4,010,536 A1977