H01F 30/14
For changing the number of phases
Official title: for changing the number of phases
H01F30/14 (For changing the number of phases) appears on 77 US grants and 64 published applications in this corpus.
Search patents in H01F- Granted patents
- 77
- Published applications
- 64
- Assignees
- 52
- Inventors
- 139
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 3 | 0 |
| 2007 | 1 | 1 |
| 2008 | 1 | 3 |
| 2009 | 1 | 1 |
| 2010 | 6 | 3 |
| 2011 | 2 | 4 |
| 2012 | 2 | 4 |
| 2013 | 3 | 6 |
| 2014 | 5 | 6 |
| 2015 | 6 | 8 |
| 2016 | 3 | 2 |
| 2017 | 2 | 6 |
| 2018 | 3 | 2 |
| 2019 | 4 | 2 |
| 2020 | 7 | 5 |
| 2021 | 7 | 5 |
| 2022 | 2 | 0 |
| 2023 | 0 | 2 |
| 2024 | 1 | 2 |
| 2025 | 1 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Distributed phase-shifting transforming power supply system10 Mar 2026US 12,573,942 B2Eaton Intelligent Power Limited
- 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
- High-frequency transformer6 Aug 2024US 12,057,256 B2Global Energy Interconnection Research Institute Co., Ltd.
- Auto-balancing transformers19 Apr 2022US 11,309,933 B2Hitachi Energy Switzerland AG
- Power system architecture with reduced common mode voltage15 Mar 2022US 11,277,075 B2The Boeing Company
- Asymmetric delta multi-pulse transformer rectifier unit, and associated systems and methods18 Jul 2024US 2024/0242875 A1Eldec Aerospace Corporation
- High-frequency transformer11 Apr 2024US 2024/0120144 A1Global Energy Interconnection Research Institute Co., Ltd.
- Distributed phase-shifting transformer power supply system30 Nov 2023US 2023/0386738 A1Eaton Intelligent Power Limited
- Autotransformer, autotransformer-rectifier unit and method for connecting a piece of electrical equipment to a three-phase grid by means of an autotransformer-rectifier unit31 Aug 2023US 2023/0274877 A1Safran
- Autotransformer rectifier unit winding arrangement14 Oct 2021US 2021/0319945 A1Hamilton Sundstrand Corporation
Most cited
By later US patents
- Autotransformer51US 5,619,407 ARobicon Corporation · 1997
- Simplified wye connected 3-phase to 9-phase auto-transformer35US 6,525,951 B12003
- Twelve-phase transformer configuration34US 6,198,647 B1Rockwell Technologies, LLC · 2001
- Generator34US 8,723,385 B2General Electric Company · 2014
- Nine-phase transformer23US 6,249,443 B1Rockwell Technologies, LLC · 2001