H01F 3/00
Cores, yokes, or armatures
Official title: Cores, Yokes, or armatures (magnetic materials H01F1/00; permanent magnets H01F7/02)
H01F3/00 (Cores, yokes, or armatures) appears on 2,543 US grants and 3,447 published applications in this corpus.
Search patents in H01F- Granted patents
- 2,543
- Published applications
- 3,447
- Assignees
- 1,080
- Inventors
- 5,603
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 8 | 0 |
| 1981 | 6 | 0 |
| 1982 | 7 | 0 |
| 1983 | 5 | 0 |
| 1984 | 7 | 0 |
| 1985 | 7 | 0 |
| 1986 | 9 | 0 |
| 1987 | 11 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 10 | 0 |
| 1991 | 13 | 0 |
| 1992 | 20 | 0 |
| 1993 | 10 | 0 |
| 1994 | 10 | 0 |
| 1995 | 11 | 0 |
| 1996 | 10 | 0 |
| 1997 | 6 | 0 |
| 1998 | 20 | 0 |
| 1999 | 13 | 0 |
| 2000 | 11 | 0 |
| 2001 | 12 | 9 |
| 2002 | 20 | 53 |
| 2003 | 30 | 49 |
| 2004 | 32 | 74 |
| 2005 | 53 | 50 |
| 2006 | 41 | 71 |
| 2007 | 43 | 73 |
| 2008 | 34 | 80 |
| 2009 | 46 | 102 |
| 2010 | 70 | 106 |
| 2011 | 72 | 89 |
| 2012 | 75 | 78 |
| 2013 | 75 | 142 |
| 2014 | 60 | 136 |
| 2015 | 74 | 168 |
| 2016 | 106 | 118 |
| 2017 | 116 | 186 |
| 2018 | 121 | 208 |
| 2019 | 156 | 234 |
| 2020 | 176 | 204 |
| 2021 | 138 | 221 |
| 2022 | 160 | 222 |
| 2023 | 170 | 244 |
| 2024 | 184 | 212 |
| 2025 | 151 | 194 |
| 2026 | 106 | 124 |
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.
- Soft magnetic powder, dust core, magnetic element, and electronic device22 Sep 2026US 12,744,142 B2Seiko Epson Corporation
- Wound core22 Sep 2026US 12,744,143 B2Nippon Steel Corporation
- Fully integrated gyrator with a high speed stack and networks of server farms and telecommunication modes incorporating the gyrator25 Aug 2026US 12,717,396 B2
- Magnetic core of an electronic assembly25 Aug 2026US 12,718,976 B2Robert Bosch GmbH
- Choke for a multi-conductor system8 Oct 2026US 2026/0311924 A1TDK Electronics Co., Ltd.
- Iron core-equipped superconducting magnet, accelerator including iron core-equipped superconducting magnet, and particle beam therapy apparatus including accelerator1 Oct 2026US 2026/0302027 A1Hitachi High-Tech Corporation
- Transformer and electrical device with transformer1 Oct 2026US 2026/0302058 A1
- Method for fabricating inductors and inductor1 Oct 2026US 2026/0302059 A1Anhui University
- Additively manufactured passive components for high frequency applications24 Sep 2026US 2026/0284745 A1University of Pittsburgh—Of the Commonwealth System of Higher Education
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
- Inductive power coupling with constant voltage output258US 4,800,328 AInductran Corporation · 1989
- Split core sensing transformer254US 7,312,686 B2Veris Industries, LLC · 2007