H01F 38/50
Transformers for galvanic isolation
Official title: {Transformers for galvanic isolation}
H01F38/50 (Transformers for galvanic isolation) appears on 246 US grants and 275 published applications in this corpus.
Search patents in H01F- Granted patents
- 246
- Published applications
- 275
- Assignees
- 169
- Inventors
- 502
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 6 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 5 | 2 |
| 2002 | 6 | 7 |
| 2003 | 5 | 4 |
| 2004 | 3 | 9 |
| 2005 | 5 | 3 |
| 2006 | 7 | 7 |
| 2007 | 4 | 12 |
| 2008 | 2 | 12 |
| 2009 | 10 | 7 |
| 2010 | 11 | 12 |
| 2011 | 11 | 5 |
| 2012 | 9 | 5 |
| 2013 | 6 | 1 |
| 2014 | 4 | 12 |
| 2015 | 4 | 15 |
| 2016 | 10 | 7 |
| 2017 | 9 | 8 |
| 2018 | 13 | 10 |
| 2019 | 7 | 15 |
| 2020 | 5 | 9 |
| 2021 | 10 | 13 |
| 2022 | 12 | 17 |
| 2023 | 14 | 20 |
| 2024 | 13 | 29 |
| 2025 | 13 | 26 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Isolation transformer and power converter25 Aug 2026US 12,718,981 B2Huawei Technologies Co., Ltd.
- Isolator17 Mar 2026US 12,580,123 B2Kabushiki Kaisha Toshiba
- Insulation module and gate driver17 Mar 2026US 12,581,992 B2Rohm Co., Ltd.
- Isolator27 Jan 2026US 12,538,780 B2Kabushiki Kaisha Toshiba
- Isolator27 Jan 2026US 12,538,806 B2Kabushiki Kaisha Toshiba
- Microelectronics device package with isolation and micro-transformer6 Aug 2026US 2026/0231819 A1Texas Instruments Incorporated
- Insulation module and gate driver2 Jul 2026US 2026/0191086 A1Rohm Co., Ltd.
- Galvanically isolated communication links using coils fabricated in molding compound28 May 2026US 2026/0148892 A1NXP USA, Inc.
- Signal transmission element14 May 2026US 2026/0135025 A1Mitsubishi Electric Corporation
- Transformer chip and signal transmission device30 Apr 2026US 2026/0120939 A1Rohm Co., Ltd.
Most cited
By later US patents
- High frequency surgery device for cutting and/or coagulating biologic tissue306US 4,969,885 AErbe Elektromedizin GmbH · 1990
- Planar transformer power supply266US 7,502,234 B2Aaron Medical Industries, Inc. · 2009
- Single unit integrated transformer assembly186US 6,483,203 B13Com Corporation · 2002
- Isolation transformer for medical equipment185US 5,615,091 ABiochem International Inc. · 1997
- Signal isolators using micro-transformers151US 7,075,329 B2Analog Devices, Inc. · 2006