H04R 2420/03
Connection circuits to selectively connect loudspeakers or headphones to amplifiers
H04R2420/03 (Connection circuits to selectively connect loudspeakers or headphones to amplifiers) appears on 534 US grants and 644 published applications in this corpus.
Search patents in H04R- Granted patents
- 534
- Published applications
- 644
- Assignees
- 261
- Inventors
- 1,156
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 2 |
| 2003 | 2 | 2 |
| 2004 | 0 | 8 |
| 2005 | 1 | 6 |
| 2006 | 5 | 7 |
| 2007 | 2 | 12 |
| 2008 | 2 | 8 |
| 2009 | 2 | 7 |
| 2010 | 6 | 14 |
| 2011 | 4 | 22 |
| 2012 | 14 | 16 |
| 2013 | 16 | 34 |
| 2014 | 28 | 33 |
| 2015 | 32 | 40 |
| 2016 | 45 | 45 |
| 2017 | 46 | 55 |
| 2018 | 49 | 44 |
| 2019 | 48 | 36 |
| 2020 | 44 | 49 |
| 2021 | 30 | 38 |
| 2022 | 33 | 42 |
| 2023 | 34 | 40 |
| 2024 | 31 | 33 |
| 2025 | 25 | 26 |
| 2026 | 20 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Earphone connection method and apparatus, earphone, and medium8 Sep 2026US 12,732,741 B2Goertek Inc.
- Method and apparatus for controlling multichannel audio frame loss concealment25 Aug 2026US 12,718,823 B2Telefonaktiebolaget LM Ericsson (publ)
- Removeable speaker for computing devices25 Aug 2026US 12,720,260 B2Dolby Laboratories Licensing Corporation
- User configurable audio loudspeaker23 Jun 2026US 12,665,329 B2Dolby Laboratories Licensing Corporation
- Tabletop speaker system2 Jun 2026US 12,645,420 B2Universal City Studios LLC
- Failure Recovery of Wearable Playback Device8 Oct 2026US 2026/0313313 A1Sonos, Inc.
- Playback Expansion1 Oct 2026US 2026/0299876 A1Sonos, Inc.
- Method and apparatus for controlling multichannel audio frame loss concealment24 Sep 2026US 2026/0290354 A1Telefonaktiebolaget LM Ericsson (publ)
- Automated local audio reinforcement and voice lift systems and methods27 Aug 2026US 2026/0253598 A1Shure Acquisition Holdings, Inc.
- Sleep modes for plugged-in players20 Aug 2026US 2026/0247075 A1
Most cited
By later US patents
- Stereophonic reproduction maintaining means and methods for operation in horizontal and vertical A/V appliance positions442US 6,882,335 B2Nokia Corporation · 2005
- Sound source localization using multiple microphone arrays414US 9,489,948 B1Amazon Technologies, Inc. · 2016
- Device playback failure recovery and redistribution228US 8,903,526 B2Sonos, Inc. · 2014
- Multi-channel speaker system and a connection system thereof169US 7,492,912 B2Samsung Electronics Co., Ltd. · 2009
- Playback device pairing147US 11,265,652 B2Sonos, Inc. · 2022