H01F 38/42
Flyback transformers
H01F38/42 (Flyback transformers) appears on 171 US grants and 95 published applications in this corpus.
Search patents in H01F- Granted patents
- 171
- Published applications
- 95
- Assignees
- 85
- Inventors
- 296
- Latest grant
- 4 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 5 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 6 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 6 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 12 | 0 |
| 1999 | 6 | 0 |
| 2000 | 4 | 0 |
| 2001 | 6 | 0 |
| 2002 | 6 | 5 |
| 2003 | 6 | 9 |
| 2004 | 4 | 6 |
| 2005 | 5 | 8 |
| 2006 | 6 | 5 |
| 2007 | 4 | 6 |
| 2008 | 3 | 2 |
| 2009 | 2 | 5 |
| 2010 | 2 | 1 |
| 2011 | 1 | 1 |
| 2012 | 1 | 1 |
| 2013 | 3 | 1 |
| 2014 | 0 | 2 |
| 2015 | 0 | 3 |
| 2016 | 2 | 2 |
| 2017 | 4 | 4 |
| 2018 | 5 | 7 |
| 2019 | 3 | 3 |
| 2020 | 1 | 1 |
| 2021 | 3 | 2 |
| 2022 | 3 | 5 |
| 2023 | 4 | 6 |
| 2024 | 3 | 5 |
| 2025 | 1 | 4 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hybrid battery charger4 Feb 2025US 12,218,543 B2Schumacher Electric Corporation
- Control circuitry for dynamic shade with electrostatic holding, and/or associated methods29 Oct 2024US 12,129,709 B2Guardian Glass, LLC
- Device for suppressing potential induced degradation and system30 Apr 2024US 11,973,349 B2Sungrow Power Supply Co., Ltd.
- Energy extraction from the parasitic elements in power converters12 Mar 2024US 11,929,665 B2Rompower Technology Holdings, LLC
- Sound wave treatment device17 Oct 2023US 11,786,263 B2Richard Wolf GmbH
- Optimized Snubber15 Jan 2026US 2026/0018989 A1Rompower Technology Holdings, LLC
- Two-Transistor Flyback Topology With Rompower High Efficiency Passive Clamp18 Sep 2025US 2025/0293584 A1Rompower Technology Holdings, LLC
- Multi-chamber transformer and mounting assembly4 Sep 2025US 2025/0279235 A1Inventronics, Inc.
- Integrated power module for electric vehicle19 Jun 2025US 2025/0196665 A1The Regents of the University of Michigan
- Totem Pole, Zero Voltage Switching Power Factor Correction Operating At Constant Frequency27 Mar 2025US 2025/0105723 A1Rompower Technology Holdings, LLC
Most cited
By later US patents
- Transformer for a flyback type converter54US 4,887,061 ATDK Corporation · 1989
- Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components25US 6,549,431 B2Power Integrations, Inc. · 2003
- High voltage winding lead and terminal structure23US 4,091,349 AGeneral Electric Company · 1978
- Flyback transformer22US 4,639,706 ASanyo Electric Co., Ltd. · 1987
- Flyback transformer21US 4,408,176 ASanyo Electric Co., Ltd. · 1983