H01F 27/00
Details of transformers or inductances, in general
H01F27/00 (Details of transformers or inductances, in general) appears on 15,342 US grants and 18,309 published applications in this corpus.
Search patents in H01F- Granted patents
- 15,342
- Published applications
- 18,309
- Assignees
- 3,982
- Inventors
- 25,686
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 69 | 0 |
| 1977 | 73 | 0 |
| 1978 | 64 | 0 |
| 1979 | 61 | 0 |
| 1980 | 67 | 0 |
| 1981 | 65 | 0 |
| 1982 | 72 | 0 |
| 1983 | 51 | 0 |
| 1984 | 83 | 0 |
| 1985 | 95 | 0 |
| 1986 | 81 | 0 |
| 1987 | 79 | 0 |
| 1988 | 71 | 0 |
| 1989 | 102 | 0 |
| 1990 | 79 | 0 |
| 1991 | 64 | 0 |
| 1992 | 70 | 0 |
| 1993 | 74 | 0 |
| 1994 | 81 | 0 |
| 1995 | 72 | 0 |
| 1996 | 58 | 0 |
| 1997 | 67 | 0 |
| 1998 | 102 | 0 |
| 1999 | 116 | 0 |
| 2000 | 130 | 0 |
| 2001 | 151 | 49 |
| 2002 | 154 | 247 |
| 2003 | 210 | 216 |
| 2004 | 184 | 268 |
| 2005 | 209 | 251 |
| 2006 | 229 | 275 |
| 2007 | 218 | 326 |
| 2008 | 193 | 373 |
| 2009 | 196 | 387 |
| 2010 | 293 | 424 |
| 2011 | 320 | 390 |
| 2012 | 314 | 433 |
| 2013 | 300 | 571 |
| 2014 | 396 | 746 |
| 2015 | 414 | 860 |
| 2016 | 553 | 912 |
| 2017 | 703 | 1067 |
| 2018 | 798 | 1220 |
| 2019 | 995 | 1344 |
| 2020 | 966 | 1290 |
| 2021 | 928 | 1290 |
| 2022 | 1010 | 1233 |
| 2023 | 1067 | 1117 |
| 2024 | 1049 | 1195 |
| 2025 | 913 | 1042 |
| 2026 | 633 | 783 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01F 27/28Coils10,485
- H01F 27/24Magnetic cores4,226
- H01F 27/34Special means for preventing or reducing unwanted electric or magnetic effects2,786
- H01F 27/02Casings2,364
- H01F 27/08Cooling1,425
- H01F 27/40Structural association with built-in electric component1,403
- H01F 27/06Mounting, supporting, or suspending transformers, reactors, or choke coils not being of804
- H01F 27/42Circuits specially adapted for the purpose of modifying, or compensating for, electric344
All 14 subgroupsShow fewer
- H01F 27/006Details of transformers or inductances, in general: with special arrangement or spacing189
- H01F 27/33Arrangements for noise damping184
- H01F 27/002Arrangements provided on the transformer facilitating its transport42
- H01F 27/008Details of transformers or inductances, in general: with temperature compensation30
- H01F 27/23Corrosion protection30
- H01F 27/004Arrangements for interchanging inductances, transformers or coils thereof25
Recent patents
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- Magnetic composition, magnetic film, stack, and circuit member8 Oct 2026US 2026/0311918 A1
- Electronic device8 Oct 2026US 2026/0311925 A1Denso Corporation
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- Coil component8 Oct 2026US 2026/0311927 A1Murata Manufacturing Co., Ltd.
Most cited
By later US patents
- Surgical system instrument sterile adapter1,479US 9,096,033 B2Intuitive Surgical Operations, Inc. · 2015
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- Surgical system sterile drape473US 8,746,252 B2Intuitive Surgical Operations, Inc. · 2014
- Contact-less power transfer438US 7,525,283 B2Access Business Group International LLC · 2009