H03F 13/00
Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers
Official title: Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier
H03F13/00 (Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers) appears on 31 US grants and 15 published applications in this corpus.
Search patents in H03F- Granted patents
- 31
- Published applications
- 15
- Assignees
- 19
- Inventors
- 44
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 5 |
| 2005 | 1 | 0 |
| 2006 | 2 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 2 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 4 |
| 2020 | 1 | 0 |
| 2021 | 2 | 1 |
| 2022 | 2 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Amplifier circuit for microphone, microphone circuit and electronic device1 Sep 2026US 12,726,164 B2AAC Technologies PTE.Ltd.
- Earbud operation during earbud insertion detection21 Mar 2023US 11,611,822 B2Avnera Corporation
- Headphone operation during headphone insertion detection4 Oct 2022US 11,463,798 B2Avnera Corporation
- Controlling parameters of an amplifier system based on a measured physical quantity18 Jan 2022US 11,228,284 B2Cirrus Logic, Inc.
- Headphone operation during headphone insertion detection25 May 2021US 11,019,419 B2Avnera Corporation
- Amplifier circuit for microphone, microphone circuit and electronic device10 Jul 2025US 2025/0226805 A1AAC Technologies PTE.Ltd.
- Earbud operation during earbud insertion detection29 Sep 2022US 2022/0312104 A1Avnera Corporation
- Headphone operation during headphone insertion detection22 Jul 2021US 2021/0227313 A1Avnera Corporation
- Headphone operation during headphone insertion detection31 Oct 2019US 2019/0335263 A1Avnera Corporation
- Operation of a personal audio device during insertion detection31 Oct 2019US 2019/0335266 A1Avnera Corporation
Most cited
By later US patents
- Surface acoustic wave device27US 5,221,870 ASumitomo Electric Industries, Ltd. · 1993
- Surface acoustic wave device25US 5,440,189 ASumitomo Electric Industries, Ltd. · 1995
- Surface acoustic wave element and electronic circuit using the same14US 6,198,197 B1Asahi Kasei Kogyo Kabushiki Kaisha · 2001
- Surface-acoustic-wave device12US 4,365,216 AClarion Co., Ltd. · 1982
- Elastic surface wave device10US 4,233,530 AClarion Co., Ltd. · 1980