H01F 27/325
Coil bobbins
Official title: {Coil bobbins (formers for coils in general H01F5/02)}
H01F27/325 (Coil bobbins) appears on 615 US grants and 817 published applications in this corpus.
Search patents in H01F- Granted patents
- 615
- Published applications
- 817
- Assignees
- 345
- Inventors
- 1,557
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 5 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 1 |
| 2002 | 3 | 10 |
| 2003 | 10 | 10 |
| 2004 | 6 | 18 |
| 2005 | 15 | 11 |
| 2006 | 17 | 14 |
| 2007 | 7 | 18 |
| 2008 | 13 | 15 |
| 2009 | 12 | 31 |
| 2010 | 18 | 19 |
| 2011 | 22 | 21 |
| 2012 | 14 | 39 |
| 2013 | 20 | 25 |
| 2014 | 23 | 34 |
| 2015 | 17 | 30 |
| 2016 | 23 | 55 |
| 2017 | 32 | 47 |
| 2018 | 36 | 50 |
| 2019 | 34 | 52 |
| 2020 | 33 | 48 |
| 2021 | 43 | 43 |
| 2022 | 45 | 48 |
| 2023 | 36 | 52 |
| 2024 | 31 | 58 |
| 2025 | 33 | 39 |
| 2026 | 27 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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
- Flat coil and coil device29 Sep 2026US 12,749,615 B2TDK Corporation
- Electric field rejection of a dual coil telemetry system18 Aug 2026US 12,708,266 B2Medtronic, Inc.
- Magnetic component18 Aug 2026US 12,712,110 B2Cyntec Co., Ltd.
- Winding structure1 Oct 2026US 2026/0302039 A1Delta Electronics, Inc.
- Power conversion apparatus24 Sep 2026US 2026/0293029 A1LG Innotek Co., Ltd.
- Switching transformer, switching power supply device comprising same, in-vehicle electric compressor comprising same, and method for manufacturing switching transformer10 Sep 2026US 2026/0269731 A1Sanden Corporation
- X-ray generation module3 Sep 2026US 2026/0262154 A1Dentium Co., Ltd.
- Magnetic assembly and manufacturing process27 Aug 2026US 2026/0253781 A1MetaPWR Electronics Co., Ltd.
Most cited
By later US patents
- Transformer construction143US 8,410,889 B2Enecsys Limited · 2013
- Transformer construction122US 8,917,156 B2Enecsys Limited · 2014
- Low-profile planar transformer for use in off-line switching power supplies94US 5,010,314 AMultisource Technology Corp. · 1991
- Step-up transformer68US 5,359,313 AToko, Inc. · 1994
- Insulated coil and coiled frame and method for making same66US 6,137,202 AGeneral Electric Company · 2000