H01F 27/2819
Planar transformers with printed windings
Official title: {Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit}
H01F27/2819 (Planar transformers with printed windings) appears on 460 US grants and 619 published applications in this corpus.
Search patents in H01F- Granted patents
- 460
- Published applications
- 619
- Assignees
- 276
- Inventors
- 1,207
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 1 |
| 2003 | 5 | 8 |
| 2004 | 7 | 3 |
| 2005 | 5 | 5 |
| 2006 | 4 | 13 |
| 2007 | 9 | 8 |
| 2008 | 13 | 20 |
| 2009 | 6 | 10 |
| 2010 | 12 | 18 |
| 2011 | 15 | 10 |
| 2012 | 11 | 10 |
| 2013 | 13 | 16 |
| 2014 | 8 | 16 |
| 2015 | 16 | 25 |
| 2016 | 18 | 19 |
| 2017 | 14 | 21 |
| 2018 | 17 | 32 |
| 2019 | 19 | 43 |
| 2020 | 24 | 40 |
| 2021 | 25 | 42 |
| 2022 | 27 | 58 |
| 2023 | 43 | 58 |
| 2024 | 46 | 61 |
| 2025 | 38 | 49 |
| 2026 | 26 | 33 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Planar transformers with interleaved windings and high voltage isolation18 Aug 2026US 12,712,111 B2The Regents of the University of Colorado, a body corporate
- Transformers with separated magnetic members18 Aug 2026US 12,712,122 B2Texas Instruments Incorporated
- Graphene in electromagnetic systems16 Jun 2026US 12,658,338 B2Infineon Technologies Austria AG
- Power supply module and transformer power supply device16 Jun 2026US 12,658,820 B2Delta Electronics (Shanghai) Co., Ltd.
- Voltage-isolated integrated circuit packages with planar transformers9 Jun 2026US 12,651,691 B2Allegro MicroSystems, LLC
- A planar winding assembly for power applications and a method of manufacturing such assembly23 Jul 2026US 2026/0213060 A1Aalborg Universitet
- Transformer and electronic modules including a transformer9 Jul 2026US 2026/0196401 A1Murata Manufacturing Co., Ltd.
- Laminate Transformer with Overlapping Lead Frame2 Jul 2026US 2026/0188552 A1Texas Instruments Incorporated
- Insulation module and gate driver2 Jul 2026US 2026/0191086 A1Rohm Co., Ltd.
- Integrated vertical inductors25 Jun 2026US 2026/0179825 A1Analog Devices, Inc.
Most cited
By later US patents
- Planar transformer power supply266US 7,502,234 B2Aaron Medical Industries, Inc. · 2009
- Integrated planar magnetics and connector126US 5,631,822 AInterpoint Corporation · 1997
- Low-profile transformer102US 8,310,327 B2Moog Inc. · 2012
- Method of making a multilayer electrical coil100US 4,873,757 AThe Foxboro Company · 1989
- Low-profile planar transformer for use in off-line switching power supplies94US 5,010,314 AMultisource Technology Corp. · 1991