H01F 27/343
Preventing or reducing surge voltages
Official title: {Preventing or reducing surge voltages; oscillations}
H01F27/343 (Preventing or reducing surge voltages) appears on 88 US grants and 69 published applications in this corpus.
Search patents in H01F- Granted patents
- 88
- Published applications
- 69
- Assignees
- 71
- Inventors
- 210
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 3 |
| 2005 | 0 | 1 |
| 2006 | 4 | 1 |
| 2007 | 0 | 2 |
| 2008 | 2 | 6 |
| 2009 | 3 | 1 |
| 2010 | 3 | 5 |
| 2011 | 4 | 2 |
| 2012 | 3 | 1 |
| 2013 | 1 | 5 |
| 2014 | 4 | 6 |
| 2015 | 0 | 2 |
| 2016 | 4 | 7 |
| 2017 | 7 | 4 |
| 2018 | 5 | 2 |
| 2019 | 3 | 4 |
| 2020 | 2 | 0 |
| 2021 | 1 | 8 |
| 2022 | 3 | 1 |
| 2023 | 4 | 4 |
| 2024 | 4 | 1 |
| 2025 | 0 | 1 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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- Planar transformer including y-capacitor23 Jul 2024US 12,046,406 B2Solum Co., Ltd.
- Laminated device2 Jul 2024US 12,027,303 B2Moda-Innochips Co., Ltd.
- Magnetic coil module and electrical connector including the magnetic coil module18 Sep 2025US 2025/0292956 A1Foxconn Interconnect Technology Limited
- 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
- Coil and a Transformer That Have Improved Electromagnetic Shielding19 Oct 2023US 2023/0335333 A1ABB Schweiz AG
- Multi-Layered Metal Frame Power Package6 Jul 2023US 2023/0215615 A1Ferric Inc.
- Electric field grading protection design surrounding a galvanic or capacitive isolator16 Mar 2023US 2023/0083839 A1Analog Devices International Unlimited Company
Most cited
By later US patents
- Planar transformer arrangement29US 7,414,507 B2International Rectifier Corporation · 2008
- Coil device25US 4,750,077 AMitsubishi Denki Kabushiki Kaisha · 1988
- Windings for electrical inductive apparatus23US 4,316,169 ATokyo Shibaura Denki Kabushiki Kaisha · 1982
- Method and application for vehicle power system isolation23US 8,836,160 B1The Boeing Company · 2014
- Method and equipment for the protection of power systems against geomagnetically induced currents17US 7,489,485 B2Forskarpatent I Syd AB · 2009