H04R 3/00
Circuits for transducers
Official title: Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F)
H04R3/00 (Circuits for transducers) appears on 16,535 US grants and 18,746 published applications in this corpus.
Search patents in H04R- Granted patents
- 16,535
- Published applications
- 18,746
- Assignees
- 3,489
- Inventors
- 23,768
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 22 | 0 |
| 1977 | 24 | 0 |
| 1978 | 34 | 0 |
| 1979 | 20 | 0 |
| 1980 | 22 | 0 |
| 1981 | 22 | 0 |
| 1982 | 22 | 0 |
| 1983 | 26 | 0 |
| 1984 | 29 | 0 |
| 1985 | 20 | 0 |
| 1986 | 21 | 0 |
| 1987 | 18 | 0 |
| 1988 | 24 | 0 |
| 1989 | 39 | 0 |
| 1990 | 25 | 0 |
| 1991 | 34 | 0 |
| 1992 | 30 | 0 |
| 1993 | 37 | 0 |
| 1994 | 26 | 0 |
| 1995 | 35 | 0 |
| 1996 | 52 | 0 |
| 1997 | 45 | 0 |
| 1998 | 76 | 0 |
| 1999 | 33 | 0 |
| 2000 | 52 | 0 |
| 2001 | 50 | 22 |
| 2002 | 39 | 84 |
| 2003 | 67 | 121 |
| 2004 | 78 | 128 |
| 2005 | 53 | 165 |
| 2006 | 116 | 195 |
| 2007 | 94 | 252 |
| 2008 | 68 | 230 |
| 2009 | 92 | 283 |
| 2010 | 117 | 313 |
| 2011 | 186 | 314 |
| 2012 | 335 | 438 |
| 2013 | 333 | 614 |
| 2014 | 394 | 695 |
| 2015 | 615 | 840 |
| 2016 | 915 | 952 |
| 2017 | 1138 | 1170 |
| 2018 | 1181 | 1274 |
| 2019 | 1429 | 1402 |
| 2020 | 1478 | 1486 |
| 2021 | 1261 | 1510 |
| 2022 | 1318 | 1489 |
| 2023 | 1259 | 1486 |
| 2024 | 1241 | 1252 |
| 2025 | 1184 | 1133 |
| 2026 | 706 | 898 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04R 3/005Circuits for transducers: for combining the signals of two or more microphones5,478
- H04R 3/12Circuits for transducers: for distributing signals to two or more loudspeakers3,964
- H04R 3/04Circuits for transducers: for correcting frequency response3,915
- H04R 3/02Circuits for transducers: for preventing acoustic reaction , i.e. acoustic oscillatory feedback1,128
- H04R 3/007Protection circuits for transducers917
- H04R 3/002Damping circuit arrangements for transducers716
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Most cited
By later US patents
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- Audio distribution system having programmable zoning features1,660US 5,761,320 AElan Home Systems, L.L.C. · 1998
- Audio distribution system having programmable zoning features1,643US 5,440,644 ASquare D Company · 1995
- Unification of multimedia devices1,620US 7,987,294 B2Altec Lansing Australia Pty Limited · 2011