H01F 27/425
For voltage transformers
Official title: {for voltage transformers}
H01F27/425 (For voltage transformers) appears on 63 US grants and 61 published applications in this corpus.
Search patents in H01F- Granted patents
- 63
- Published applications
- 61
- Assignees
- 34
- Inventors
- 94
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 2 |
| 2016 | 0 | 0 |
| 2017 | 2 | 10 |
| 2018 | 7 | 22 |
| 2019 | 17 | 5 |
| 2020 | 11 | 7 |
| 2021 | 7 | 1 |
| 2022 | 2 | 4 |
| 2023 | 2 | 3 |
| 2024 | 5 | 3 |
| 2025 | 3 | 0 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Substrate embedded magnetic core inductors and method of making8 Sep 2026US 12,731,717 B2Intel Corporation
- Adapter and charging method19 Aug 2025US 12,395,002 B2Guangdong Oppo Mobile Telecommunications Corp., Ltd.
- Substrate embedded magnetic core inductors and method of making18 Feb 2025US 12,230,430 B2Intel Corporation
- Digital communication systems and associated methods14 Jan 2025US 12,199,582 B2Maxim Integrated Products, Inc.
- Protection of an AC device12 Nov 2024US 12,140,611 B2HSP Hochspannungsgeräte GmbH
- Low-power voltage transformer having temperature compensation applied thereto, and temperature compensation method thereof16 Jul 2026US 2026/0202449 A1Hyosung Heavy Industries Corporation
- Packaged module with low modulus composite magnetic molding material12 Feb 2026US 2026/0047443 A1Monolithic Power Systems, Inc.
- Submodule for semiconductor transformer in single packaging with excellent performance of insulation and prevention against insulation heating22 Aug 2024US 2024/0282500 A1Hyosung Heavy Industries Corporation
- Surface-mounted magnetic-component module15 Aug 2024US 2024/0274346 A1Murata Manufacturing Co., Ltd.
- Ferromagnetic harmonic elimination method for active matched resistance voltage transformer based on pid adjustment29 Feb 2024US 2024/0072531 A1Qujing Power Supply Bureau of Yunnan Power Grid Co., Ltd
Most cited
By later US patents
- Charging system and charging method, and power adapter14US 10,122,201 B2Guangdong Oppo Mobile Telecommunications Corp., Ltd. · 2018
- Charging system and charging method, and power adapter13US 10,181,745 B2Guangdong Oppo Mobile Telecommunications Corp., Ltd. · 2019
- Systems and methods for self-adaptive current control12US 10,050,534 B1Cummins Power Generation IP, Inc. · 2018
- Charging device and charging method for charging a battery12US 10,090,700 B2Guangdong Oppo Mobile Telecommunications Corp., Ltd. · 2018
- Differential transformer correction by compensation11US 5,747,980 ALeviton Manufacturing Co., Inc. · 1998