H01F 19/02
Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably
Official title: Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably beyond the audio range
H01F19/02 (Audio-frequency transformers or mutual inductances, i.e. not suitable for handling frequencies considerably) appears on 20 US grants and 14 published applications in this corpus.
Search patents in H01F- Granted patents
- 20
- Published applications
- 14
- Assignees
- 16
- Inventors
- 32
- Latest grant
- 15 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 1 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 2 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 3 | 3 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 2 |
| 2023 | 1 | 2 |
| 2024 | 1 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Magnetic device15 Jul 2025US 12,362,083 B2Cyntec Co., Ltd.
- Light guide assembly9 Jan 2024US 11,867,941 B2Cyntec Co., Ltd.
- Signal amplifier circuit, voltage converter and system21 Feb 2023US 11,588,446 B2Burmester Audiosysteme GmbH
- Signal amplifier circuit, voltage converter and system12 Jul 2022US 11,387,787 B2Burmester Audiosysteme GmbH
- Adjustable compact line output converter with amplifier trigger10 Dec 2019US 10,505,510 B2
- Collider system for the generation and reproduction of signals from trisonic audio with zero latency28 Aug 2025US 2025/0274711 A1
- Light guide assembly9 Nov 2023US 2023/0358945 A1Cyntec Co., Ltd.
- Magnetic device9 Nov 2023US 2023/0360833 A1Cyntec Co., Ltd.
- Inductive component and method for adjusting an inductance value20 Oct 2022US 2022/0336150 A1Philip Morris Products S. A.
- Signal amplifier circuit, voltage converter and system15 Sep 2022US 2022/0294397 A1Burmester Audiosysteme GmbH
Most cited
By later US patents
- Single bobbin transformer having multiple delink windings and method of making same24US 4,473,811 AGeneral Instrument Corporation · 1984
- Double insulated transformer of the coaxial type and method of assembling the same17US 5,200,731 AMusashino Tuko Co., Ltd. · 1993
- Device for the contactless transmission of electrical energy, in particular for pyrotechnic ignitors or firing devices8US 4,145,968 ACompagnie de Signaux et d'Entreprises Electriques · 1979
- Audio-frequency injection transformers for ripple control8US 4,156,221 AMesswandler-Bau GmbH · 1979
- RF high power, high frequency, non-integer turns ratio bandpass auto-transformer and method8US 5,309,120 AHarris Corporation · 1994