H01F 19/04
Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio
Official title: Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range (resonant circuits H03H)
H01F19/04 (Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio) appears on 568 US grants and 575 published applications in this corpus.
Search patents in H01F- Granted patents
- 568
- Published applications
- 575
- Assignees
- 305
- Inventors
- 1,128
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 7 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 5 | 0 |
| 1997 | 11 | 0 |
| 1998 | 6 | 0 |
| 1999 | 5 | 0 |
| 2000 | 7 | 0 |
| 2001 | 9 | 4 |
| 2002 | 8 | 6 |
| 2003 | 6 | 10 |
| 2004 | 13 | 29 |
| 2005 | 12 | 8 |
| 2006 | 14 | 17 |
| 2007 | 8 | 12 |
| 2008 | 12 | 23 |
| 2009 | 11 | 14 |
| 2010 | 23 | 32 |
| 2011 | 19 | 17 |
| 2012 | 13 | 18 |
| 2013 | 15 | 20 |
| 2014 | 19 | 32 |
| 2015 | 25 | 24 |
| 2016 | 24 | 13 |
| 2017 | 22 | 28 |
| 2018 | 21 | 24 |
| 2019 | 20 | 23 |
| 2020 | 24 | 37 |
| 2021 | 19 | 41 |
| 2022 | 27 | 40 |
| 2023 | 34 | 35 |
| 2024 | 45 | 34 |
| 2025 | 31 | 18 |
| 2026 | 13 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Compact thin-film surface mountable coupler21 Jul 2026US 12,688,968 B2KYOCERA AVX Components Corporation
- Digital isolator9 Jun 2026US 12,651,963 B2Silergy Semiconductor Technology (Hangzhou) LTD
- Driving circuit and control board9 Jun 2026US 12,652,044 B2Rohm Co., Ltd.
- Electronic component19 May 2026US 12,633,445 B2Murata Manufacturing Co., Ltd.
- Semiconductor device12 May 2026US 12,628,715 B2Renesas Electronics Corporation
- Power-Over Data Line Communication Device and Power-Over Data Line Communication System9 Jul 2026US 2026/0197208 A1Astemo, Ltd.
- Magnetic flux cancellation inductor pairing2 Jul 2026US 2026/0188568 A1NVIDIA Corporation
- Insulation module and gate driver2 Jul 2026US 2026/0191086 A1Rohm Co., Ltd.
- Power detection18 Jun 2026US 2026/0172064 A1Huawei Technologies Co., Ltd.
- Semiconductor Device and Method of Making a Balun with an Improved Common-Mode Rejection Ratio28 May 2026US 2026/0148888 A1JCET STATS ChipPAC Korea Limited
Most cited
By later US patents
- Transmitter head and system for contactless energy transmission205US 7,492,247 B2Sew-Eurodrive GmbH & Co. KG · 2009
- Hybrid integrated circuit planar transformer191US 5,353,001 ABurr-Brown Corporation · 1994
- Single unit integrated transformer assembly186US 6,483,203 B13Com Corporation · 2002
- Isolation transformer for medical equipment185US 5,615,091 ABiochem International Inc. · 1997
- Inverter transformer172US 5,812,045 AToko, Inc. · 1998