H01F 27/24
Magnetic cores
H01F27/24 (Magnetic cores) appears on 4,226 US grants and 5,756 published applications in this corpus.
Search patents in H01F- Granted patents
- 4,226
- Published applications
- 5,756
- Assignees
- 1,345
- Inventors
- 8,385
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 9 | 0 |
| 1978 | 6 | 0 |
| 1979 | 12 | 0 |
| 1980 | 13 | 0 |
| 1981 | 7 | 0 |
| 1982 | 14 | 0 |
| 1983 | 9 | 0 |
| 1984 | 15 | 0 |
| 1985 | 16 | 0 |
| 1986 | 15 | 0 |
| 1987 | 13 | 0 |
| 1988 | 13 | 0 |
| 1989 | 17 | 0 |
| 1990 | 19 | 0 |
| 1991 | 13 | 0 |
| 1992 | 13 | 0 |
| 1993 | 10 | 0 |
| 1994 | 8 | 0 |
| 1995 | 16 | 0 |
| 1996 | 7 | 0 |
| 1997 | 12 | 0 |
| 1998 | 16 | 0 |
| 1999 | 21 | 0 |
| 2000 | 18 | 0 |
| 2001 | 14 | 7 |
| 2002 | 24 | 27 |
| 2003 | 33 | 38 |
| 2004 | 30 | 45 |
| 2005 | 33 | 35 |
| 2006 | 28 | 50 |
| 2007 | 32 | 51 |
| 2008 | 31 | 47 |
| 2009 | 28 | 55 |
| 2010 | 43 | 75 |
| 2011 | 44 | 53 |
| 2012 | 43 | 76 |
| 2013 | 55 | 128 |
| 2014 | 73 | 153 |
| 2015 | 75 | 256 |
| 2016 | 137 | 254 |
| 2017 | 184 | 355 |
| 2018 | 249 | 477 |
| 2019 | 321 | 547 |
| 2020 | 357 | 507 |
| 2021 | 326 | 533 |
| 2022 | 382 | 476 |
| 2023 | 424 | 401 |
| 2024 | 410 | 424 |
| 2025 | 318 | 384 |
| 2026 | 217 | 302 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Core piece, reactor, converter, and power conversion device6 Oct 2026US 12,755,888 B2Autonetworks Technologies, Ltd.
- Method for reducing electrical consumption using magnetic transformer devices6 Oct 2026US 12,755,889 B2Harmonify AB
- Coil device6 Oct 2026US 12,755,895 B2TDK Corporation
- Semiconductor device and semiconductor device fabrication method6 Oct 2026US 12,757,726 B2Lapis Semiconductor Co., Ltd.
- Magnetic base body containing metal magnetic particles and coil component including the same29 Sep 2026US 12,749,610 B2Taiyo Yuden Co., Ltd.
- Transformer stacked iron core elasticity matrix determination method and vibration analysis method, and non-transitory computer readable medium8 Oct 2026US 2026/0309681 A1Jfe Steel Corporation
- Electronic device8 Oct 2026US 2026/0311925 A1Denso Corporation
- Magnetic shunt for toroidal magnetic assembly8 Oct 2026US 2026/0311929 A1Tesla, Inc.
- Medical Wireless Charging Device With Ferrite Stack Centered And Directly Contacted To A Charging Coil8 Oct 2026US 2026/0312429 A1Greatbatch Ltd.
- Method of manufacturing a coil component1 Oct 2026US 2026/0295668 A1Murata Manufacturing Co., Ltd.
Most cited
By later US patents
- Contact-less power transfer495US 6,906,495 B2Splashpower Limited · 2005
- Contact-less power transfer438US 7,525,283 B2Access Business Group International LLC · 2009
- Ferromagnetic powder for dust core300US 7,498,080 B2Foxconn Technology Co., Ltd. · 2009
- Split core sensing transformer254US 7,312,686 B2Veris Industries, LLC · 2007
- Combination transformer with common core portions231US 4,488,136 AWestinghouse Electric Corp. · 1984