H04R 27/00
Public address systems
Official title: Public address systems (circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; {monitoring or testing arrangements for public address systems H04R29/007}; amplifiers H03F)
H04R27/00 (Public address systems) appears on 2,987 US grants and 3,381 published applications in this corpus.
Search patents in H04R- Granted patents
- 2,987
- Published applications
- 3,381
- Assignees
- 901
- Inventors
- 4,404
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 6 | 0 |
| 1978 | 8 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 6 | 0 |
| 1987 | 0 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 12 | 0 |
| 1993 | 8 | 0 |
| 1994 | 5 | 0 |
| 1995 | 14 | 0 |
| 1996 | 10 | 0 |
| 1997 | 10 | 0 |
| 1998 | 11 | 0 |
| 1999 | 11 | 0 |
| 2000 | 11 | 0 |
| 2001 | 9 | 5 |
| 2002 | 7 | 17 |
| 2003 | 8 | 38 |
| 2004 | 10 | 29 |
| 2005 | 8 | 41 |
| 2006 | 19 | 60 |
| 2007 | 25 | 60 |
| 2008 | 14 | 55 |
| 2009 | 16 | 64 |
| 2010 | 49 | 65 |
| 2011 | 40 | 68 |
| 2012 | 96 | 73 |
| 2013 | 65 | 123 |
| 2014 | 65 | 120 |
| 2015 | 122 | 178 |
| 2016 | 179 | 246 |
| 2017 | 250 | 233 |
| 2018 | 255 | 246 |
| 2019 | 268 | 273 |
| 2020 | 258 | 209 |
| 2021 | 209 | 214 |
| 2022 | 194 | 205 |
| 2023 | 213 | 227 |
| 2024 | 173 | 210 |
| 2025 | 173 | 186 |
| 2026 | 99 | 136 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Speakerphone with room acoustics characterization and related methods6 Oct 2026US 12,756,775 B2
- Arbitration-based voice recognition29 Sep 2026US 12,749,486 B2Sonos, Inc.
- Distributed generative models29 Sep 2026US 12,750,620 B2Sonos, Inc.
- Media playback based on sensor data29 Sep 2026US 12,750,630 B2Sonos, Inc.
- Playback device pairing22 Sep 2026US 12,745,041 B2Sonos, Inc.
- Failure Recovery of Wearable Playback Device8 Oct 2026US 2026/0313313 A1Sonos, Inc.
- Playback Expansion1 Oct 2026US 2026/0299876 A1Sonos, Inc.
- Multi-Zone Setup And Configuration Of Multi-Player Playback Devices1 Oct 2026US 2026/0299878 A1Sonos, Inc.
- Predictive Signal Correction1 Oct 2026US 2026/0304030 A1Sonos, Inc.
- Systems and methods for uwb multi-static radar24 Sep 2026US 2026/0287725 A1
Most cited
By later US patents
- Method and apparatus for controlling multimedia players in a multi-zone system2,132US 7,571,014 B1Sonos, Inc. · 2009
- System and method for synchronizing operations among a plurality of independently clocked digital data processing devices1,949US 8,234,395 B2Sonos, Inc. · 2012
- Controlling and manipulating groupings in a multi-zone media system1,881US 8,483,853 B1Sonos, Inc. · 2013
- Audio network distribution system1,807US 7,643,894 B2Netstreams, LLC · 2010
- Wired, wireless, infrared, and powerline audio entertainment systems1,763US 7,853,341 B2KSC Industries, Inc. · 2010