H01F 30/02
Auto-transformers
H01F30/02 (Auto-transformers) appears on 72 US grants and 83 published applications in this corpus.
Search patents in H01F- Granted patents
- 72
- Published applications
- 83
- Assignees
- 52
- Inventors
- 153
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 3 |
| 2006 | 5 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 4 |
| 2009 | 1 | 1 |
| 2010 | 7 | 6 |
| 2011 | 4 | 3 |
| 2012 | 1 | 3 |
| 2013 | 1 | 7 |
| 2014 | 5 | 5 |
| 2015 | 2 | 2 |
| 2016 | 1 | 5 |
| 2017 | 3 | 5 |
| 2018 | 5 | 4 |
| 2019 | 4 | 4 |
| 2020 | 5 | 5 |
| 2021 | 2 | 6 |
| 2022 | 3 | 4 |
| 2023 | 3 | 3 |
| 2024 | 2 | 3 |
| 2025 | 2 | 3 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Power converter with multi-tapped autotransformer25 Aug 2026US 12,719,360 B2Infineon Technologies Austria AG
- Broadband balun structures and applications thereof30 Jun 2026US 12,671,385 B2Nankai University
- Power conversion phases and coupling inductance19 May 2026US 12,633,836 B2Infineon Technologies Austria AG
- Transformer and method of generating multiple multiphase output signals4 Nov 2025US 12,462,974 B2The Boeing Company
- Autotransformer, autotransformer-rectifier unit and method for connecting a piece of electrical equipment to a three-phase grid by means of an autotransformer-rectifier unit1 Apr 2025US 12,266,469 B2Safran
- Method and apparatus for predicting current of load in autotransformer25 Jun 2026US 2026/0177592 A1Hanwha Solutions Corporation
- Device for the return of homopolar residual currents flowing through the neutral of an electrical distribution system11 Jun 2026US 2026/0163375 A1
- Hvdc transformer configuration for split pccs30 Apr 2026US 2026/0121416 A1GE Infrastructure Technology LLC
- Iot-based automated voltage controller system for motor operated three-phase autotransformer26 Feb 2026US 2026/0056564 A1
- Power converter with multi-tapped autotransformer19 Jun 2025US 2025/0202353 A1Infineon Technologies Austria AG
Most cited
By later US patents
- Power supply circuit with symmetrically tapped auto-transformer184US 4,906,859 ANEC Corporation · 1990
- Printed circuit board assembly for filtering noise of network signal transmission59US 9,985,600 B2Foxconn Interconnect Technology Limited · 2018
- Autotransformer51US 5,619,407 ARobicon Corporation · 1997
- Generator34US 8,723,385 B2General Electric Company · 2014
- Rectification system for improving power quality of electrical power systems20US 6,995,993 B2Honeywell International Inc. · 2006