H01F 38/08
High-leakage transformers or inductances
H01F38/08 (High-leakage transformers or inductances) appears on 332 US grants and 325 published applications in this corpus.
Search patents in H01F- Granted patents
- 332
- Published applications
- 325
- Assignees
- 190
- Inventors
- 688
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 6 | 0 |
| 1989 | 2 | 0 |
| 1990 | 7 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 7 | 0 |
| 2001 | 5 | 2 |
| 2002 | 4 | 7 |
| 2003 | 8 | 9 |
| 2004 | 6 | 12 |
| 2005 | 11 | 23 |
| 2006 | 18 | 19 |
| 2007 | 18 | 29 |
| 2008 | 18 | 32 |
| 2009 | 8 | 25 |
| 2010 | 26 | 26 |
| 2011 | 19 | 9 |
| 2012 | 17 | 4 |
| 2013 | 3 | 4 |
| 2014 | 4 | 12 |
| 2015 | 6 | 9 |
| 2016 | 7 | 8 |
| 2017 | 7 | 8 |
| 2018 | 5 | 9 |
| 2019 | 9 | 8 |
| 2020 | 7 | 9 |
| 2021 | 7 | 12 |
| 2022 | 8 | 8 |
| 2023 | 9 | 13 |
| 2024 | 6 | 11 |
| 2025 | 7 | 10 |
| 2026 | 6 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Coil device6 Oct 2026US 12,755,895 B2TDK Corporation
- Display device comprising transformer comprising core having structure related with coupling factor of inductor9 Jun 2026US 12,651,553 B2Samsung Electronics Co., Ltd.
- Transformer and flat panel display device comprising same17 Mar 2026US 12,580,120 B2LG Innotek Co., Ltd.
- Coupled inductors for low electromagnetic interference24 Feb 2026US 12,562,308 B2Maxim Integrated Products, Inc.
- Low voltage high current power supply device27 Jan 2026US 12,537,130 B2Hefei Sanyu Electric Co., Ltd
- Transformer and electrical device with transformer1 Oct 2026US 2026/0302058 A1
- Magnetic component7 May 2026US 2026/0128205 A1Cyntec Co., Ltd.
- Transformers with high-permeability material2 Apr 2026US 2026/0094759 A1Lite-On Technology Corporation
- Transformers with top leakage flux path for power converters5 Mar 2026US 2026/0066808 A1Monolithic Power Systems, Inc.
- Modular transformer-rectifier blocks for power converters5 Mar 2026US 2026/0066809 A1
Most cited
By later US patents
- Method and means for combining a transformer and inductor on a single core structure71US 5,783,984 AHughes Electronics Corporation · 1998
- Frequency modulated ballast with loosely coupled transformer for parallel gas discharge lamp control63US 6,181,066 B2Power Circuit Innovations, Inc. · 2001
- Integrated transformer and inductor61US 4,613,841 AGeneral Electric Company · 1986
- Full wave series resonant type DC to DC power converter with integrated magnetics60US 7,136,293 B22006
- Combination equalizing transformer and ballast choke52US 6,323,602 B1U. S. Philips Corporation · 2001