H01F 27/26
Fastening parts of the core together
Official title: Fastening parts of the core together; Fastening or mounting the core on casing or support (on coil H01F27/30)
H01F27/26 (Fastening parts of the core together) appears on 1,013 US grants and 1,395 published applications in this corpus.
Search patents in H01F- Granted patents
- 1,013
- Published applications
- 1,395
- Assignees
- 472
- Inventors
- 2,519
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 2 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 5 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 3 | 0 |
| 1993 | 6 | 0 |
| 1994 | 4 | 0 |
| 1995 | 8 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 8 | 0 |
| 1999 | 9 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 4 |
| 2002 | 13 | 12 |
| 2003 | 11 | 8 |
| 2004 | 7 | 22 |
| 2005 | 16 | 8 |
| 2006 | 6 | 17 |
| 2007 | 12 | 21 |
| 2008 | 8 | 17 |
| 2009 | 12 | 28 |
| 2010 | 21 | 37 |
| 2011 | 22 | 28 |
| 2012 | 23 | 32 |
| 2013 | 24 | 47 |
| 2014 | 30 | 36 |
| 2015 | 23 | 65 |
| 2016 | 30 | 49 |
| 2017 | 43 | 58 |
| 2018 | 40 | 88 |
| 2019 | 47 | 99 |
| 2020 | 73 | 118 |
| 2021 | 53 | 111 |
| 2022 | 80 | 114 |
| 2023 | 82 | 107 |
| 2024 | 94 | 124 |
| 2025 | 73 | 82 |
| 2026 | 47 | 63 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Core piece, reactor, converter, and power conversion device6 Oct 2026US 12,755,888 B2Autonetworks Technologies, Ltd.
- Double-side-cooling power module29 Sep 2026US 12,751,337 B2Monolithic Power Systems, Inc.
- Compensation structure for reducing circulating current in window of transformer and transformer comprising compensation structure22 Sep 2026US 12,744,155 B2Siemens Energy Global GmbH & Co. KG
- Transformer15 Sep 2026US 12,738,408 B2Lite-On Technology Corporation
- Substrate embedded magnetic core inductors and method of making8 Sep 2026US 12,731,717 B2Intel Corporation
- Method to integrate micro transformers into printed circuit board for step-down voltages24 Sep 2026US 2026/0292992 A1Cisco Technology, Inc.
- Method for controlling magnetic flux17 Sep 2026US 2026/0279645 A1Delta Electronics, Inc.
- Coil component17 Sep 2026US 2026/0279646 A1Sumida Corporation
- Magnetic assembly and manufacturing process27 Aug 2026US 2026/0253781 A1MetaPWR Electronics Co., Ltd.
- Power converter and magnetic element27 Aug 2026US 2026/0254361 A1Delta Electronics, Inc.
Most cited
By later US patents
- Split core sensing transformer254US 7,312,686 B2Veris Industries, LLC · 2007
- Hybrid integrated circuit planar transformer191US 5,353,001 ABurr-Brown Corporation · 1994
- Ferrite core185US 6,501,362 B1UMEC USA, Inc. · 2002
- Inverter transformer172US 5,812,045 AToko, Inc. · 1998
- Transformer assembling method, transformer, transformer-mounted substrate, power supply unit having transformer-mounted substrate, and recording apparatus including power supply unit96US 6,437,673 B1Canon Kabushiki Kaisha · 2002