H01F 27/32
Insulating of coils, windings, or parts thereof
H01F27/32 (Insulating of coils, windings, or parts thereof) appears on 2,662 US grants and 3,441 published applications in this corpus.
Search patents in H01F- Granted patents
- 2,662
- Published applications
- 3,441
- Assignees
- 961
- Inventors
- 5,870
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 17 | 0 |
| 1977 | 9 | 0 |
| 1978 | 12 | 0 |
| 1979 | 9 | 0 |
| 1980 | 12 | 0 |
| 1981 | 11 | 0 |
| 1982 | 12 | 0 |
| 1983 | 10 | 0 |
| 1984 | 14 | 0 |
| 1985 | 17 | 0 |
| 1986 | 3 | 0 |
| 1987 | 12 | 0 |
| 1988 | 4 | 0 |
| 1989 | 9 | 0 |
| 1990 | 6 | 0 |
| 1991 | 6 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 14 | 0 |
| 1995 | 10 | 0 |
| 1996 | 9 | 0 |
| 1997 | 7 | 0 |
| 1998 | 7 | 0 |
| 1999 | 18 | 0 |
| 2000 | 23 | 0 |
| 2001 | 27 | 8 |
| 2002 | 24 | 51 |
| 2003 | 37 | 47 |
| 2004 | 33 | 63 |
| 2005 | 48 | 49 |
| 2006 | 53 | 46 |
| 2007 | 38 | 76 |
| 2008 | 39 | 68 |
| 2009 | 39 | 82 |
| 2010 | 67 | 74 |
| 2011 | 65 | 71 |
| 2012 | 50 | 78 |
| 2013 | 51 | 75 |
| 2014 | 57 | 86 |
| 2015 | 45 | 105 |
| 2016 | 69 | 111 |
| 2017 | 82 | 160 |
| 2018 | 87 | 231 |
| 2019 | 128 | 314 |
| 2020 | 160 | 275 |
| 2021 | 192 | 297 |
| 2022 | 231 | 259 |
| 2023 | 242 | 227 |
| 2024 | 222 | 260 |
| 2025 | 180 | 188 |
| 2026 | 135 | 140 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01F 27/324Insulation between coil and core, between different winding sections, around the coil1,307
- H01F 27/323Insulation between winding turns, between winding layers629
- H01F 27/327Encapsulating or impregnating505
- H01F 27/322The insulation forming channels for circulation of the fluid118
- H01F 27/321Using a fluid for insulating purposes only97
- H01F 2027/329Insulation with semiconducting layerIndexing code36
Recent patents
- Multilayer-type coil component6 Oct 2026US 12,755,894 B2Murata Manufacturing Co., Ltd.
- Coil device6 Oct 2026US 12,755,895 B2TDK Corporation
- Bobbin wound coil for an electromagnetic coupling6 Oct 2026US 12,755,896 B2Warner Electric Technology LLC
- Magnetic base body containing metal magnetic particles and coil component including the same29 Sep 2026US 12,749,610 B2Taiyo Yuden Co., Ltd.
- Coil component29 Sep 2026US 12,749,612 B2Samsung Electro-Mechanics Co., Ltd.
- Coil substrate, motor coil substrate, and motor8 Oct 2026US 2026/0311926 A1Ibiden Co., Ltd.
- Coil component1 Oct 2026US 2026/0302033 A1TDK Corporation
- Coil component1 Oct 2026US 2026/0302037 A1TDK Corporation
- Winding structure1 Oct 2026US 2026/0302039 A1Delta Electronics, Inc.
- Coil component1 Oct 2026US 2026/0302041 A1TDK Corporation
Most cited
By later US patents
- Transformer construction143US 8,410,889 B2Enecsys Limited · 2013
- Character count determination for a digital image125US 9,286,514 B1United Services Automobile Association (USAA) · 2016
- Transformer construction122US 8,917,156 B2Enecsys Limited · 2014
- Diamond-based transformers and power convertors111US 6,181,231 B2Silicon Graphics, Inc. · 2001
- Character count determination for a digital image111US 9,904,848 B1United Services Automobile Association (USAA) · 2018