H01F 30/00
Fixed transformers not covered by group h01f19/00
Official title: Fixed transformers not covered by group H01F19/00
H01F30/00 (Fixed transformers not covered by group h01f19/00) appears on 1,065 US grants and 1,085 published applications in this corpus.
Search patents in H01F- Granted patents
- 1,065
- Published applications
- 1,085
- Assignees
- 648
- Inventors
- 2,337
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 10 | 0 |
| 1978 | 7 | 0 |
| 1979 | 7 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 6 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 13 | 0 |
| 1986 | 9 | 0 |
| 1987 | 16 | 0 |
| 1988 | 9 | 0 |
| 1989 | 21 | 0 |
| 1990 | 17 | 0 |
| 1991 | 9 | 0 |
| 1992 | 9 | 0 |
| 1993 | 9 | 0 |
| 1994 | 16 | 0 |
| 1995 | 11 | 0 |
| 1996 | 11 | 0 |
| 1997 | 12 | 0 |
| 1998 | 9 | 0 |
| 1999 | 9 | 0 |
| 2000 | 10 | 0 |
| 2001 | 9 | 6 |
| 2002 | 14 | 19 |
| 2003 | 19 | 23 |
| 2004 | 16 | 32 |
| 2005 | 27 | 36 |
| 2006 | 33 | 36 |
| 2007 | 35 | 42 |
| 2008 | 28 | 50 |
| 2009 | 25 | 42 |
| 2010 | 42 | 50 |
| 2011 | 36 | 33 |
| 2012 | 24 | 29 |
| 2013 | 29 | 54 |
| 2014 | 25 | 44 |
| 2015 | 37 | 52 |
| 2016 | 35 | 36 |
| 2017 | 40 | 45 |
| 2018 | 32 | 59 |
| 2019 | 52 | 74 |
| 2020 | 53 | 70 |
| 2021 | 43 | 39 |
| 2022 | 44 | 40 |
| 2023 | 37 | 42 |
| 2024 | 33 | 53 |
| 2025 | 37 | 51 |
| 2026 | 21 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Integral transformer junction module6 Oct 2026US 12,755,887 B2
- Current transformer assemblies8 Sep 2026US 12,731,727 B2Schneider Electric USA, Inc.
- Transformer for LDC of electric vehicle1 Sep 2026US 12,725,731 B2Atum Co., Ltd.
- Power converter with multi-tapped autotransformer25 Aug 2026US 12,719,360 B2Infineon Technologies Austria AG
- Transformer, power conversion device, product group of transformer, and manufacturing method for transformer18 Aug 2026US 12,712,115 B2Mitsubishi Electric Corporation
- Coil component and electronic/electric device27 Aug 2026US 2026/0253790 A1Delta Electronics (Japan), Inc.
- Integral transformer junction module13 Aug 2026US 2026/0237549 A1
- 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
- Method and apparatus for predicting current of load in autotransformer25 Jun 2026US 2026/0177592 A1Hanwha Solutions Corporation
Most cited
By later US patents
- Split core sensing transformer254US 7,312,686 B2Veris Industries, LLC · 2007
- Combination transformer with common core portions231US 4,488,136 AWestinghouse Electric Corp. · 1984
- Switching electrical power supply utilizing miniature inductors integrally in a PCB210US 4,622,627 ATheta-J Corporation · 1986
- Power supply system199US 7,514,818 B2Matsushita Electric Works, Ltd. · 2009
- High-power, low-loss high-frequency electrical coil188US 3,946,349 AThe United States of America as represented by the Secretary of the Air Force · 1976