H01F 30/12
Two-phase, three-phase or polyphase transformers
H01F30/12 (Two-phase, three-phase or polyphase transformers) appears on 378 US grants and 419 published applications in this corpus.
Search patents in H01F- Granted patents
- 378
- Published applications
- 419
- Assignees
- 246
- Inventors
- 869
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 7 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 1 |
| 2002 | 2 | 4 |
| 2003 | 3 | 6 |
| 2004 | 6 | 6 |
| 2005 | 6 | 9 |
| 2006 | 10 | 12 |
| 2007 | 6 | 9 |
| 2008 | 8 | 16 |
| 2009 | 6 | 8 |
| 2010 | 14 | 15 |
| 2011 | 15 | 19 |
| 2012 | 6 | 14 |
| 2013 | 10 | 29 |
| 2014 | 16 | 22 |
| 2015 | 21 | 23 |
| 2016 | 13 | 16 |
| 2017 | 14 | 21 |
| 2018 | 10 | 20 |
| 2019 | 23 | 31 |
| 2020 | 25 | 30 |
| 2021 | 20 | 15 |
| 2022 | 14 | 17 |
| 2023 | 14 | 21 |
| 2024 | 13 | 20 |
| 2025 | 18 | 23 |
| 2026 | 9 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Transformer device5 May 2026US 12,620,524 B2Dmg Mori Co., Ltd.
- Reactor, converter, and power conversion device21 Apr 2026US 12,609,231 B2Autonetworks Technologies, Ltd.
- Method for manufacturing loops for a magnetic circuit21 Apr 2026US 12,609,241 B2Safran Electrical & Power
- Low-EMI transformer14 Apr 2026US 12,603,221 B2Ezone Energy AS
- Magnetic integrated device10 Mar 2026US 12,573,543 B2Lite-On Electronics (Guangzhou) Limited
- Integrated magnetic assembly for a multiphase dc-to-dc power converter13 Aug 2026US 2026/0237554 A1Delta Electronics (Thailand) Public Co., Ltd.
- Electronic component, in particular a three-phase transformer for an isolated voltage converter9 Jul 2026US 2026/0196404 A1Valeo Electrification
- Dynamic power flow controller (dpfc) for regulating power flow in a power transmission line25 Jun 2026US 2026/0178063 A1
- Multi-module dc-dc converter, integrated magnetic component, and manufacturing method of integrated magnetic component11 Jun 2026US 2026/0162882 A1Delta Electronics, Inc.
- Device for the return of homopolar residual currents flowing through the neutral of an electrical distribution system11 Jun 2026US 2026/0163375 A1
Most cited
By later US patents
- Combination transformer with common core portions231US 4,488,136 AWestinghouse Electric Corp. · 1984
- Summing transformer for star-delta inverter having a single secondary winding for each group of primary windings99US 5,177,460 A1993
- Summing transformer core for star-delta inverter having a separate secondary winding for each primary winding90US 5,182,535 A1993
- Phase-shifting transformer with a six-phase core85US 5,003,277 AMitsubishi Denki Kabushiki Kaisha · 1991
- Transformers for multipulse AC/DC converters77US 6,101,113 A2000