H04R 3/04
Circuits for transducers: for correcting frequency response
Official title: for correcting frequency response
H04R3/04 (Circuits for transducers: for correcting frequency response) appears on 3,915 US grants and 4,363 published applications in this corpus.
Search patents in H04R- Granted patents
- 3,915
- Published applications
- 4,363
- Assignees
- 1,133
- Inventors
- 6,352
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 7 | 0 |
| 1978 | 9 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 5 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 10 | 0 |
| 1985 | 9 | 0 |
| 1986 | 8 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 10 | 0 |
| 1990 | 8 | 0 |
| 1991 | 9 | 0 |
| 1992 | 7 | 0 |
| 1993 | 7 | 0 |
| 1994 | 5 | 0 |
| 1995 | 8 | 0 |
| 1996 | 8 | 0 |
| 1997 | 4 | 0 |
| 1998 | 10 | 0 |
| 1999 | 7 | 0 |
| 2000 | 6 | 0 |
| 2001 | 19 | 4 |
| 2002 | 7 | 10 |
| 2003 | 10 | 8 |
| 2004 | 10 | 16 |
| 2005 | 5 | 27 |
| 2006 | 9 | 32 |
| 2007 | 9 | 51 |
| 2008 | 7 | 49 |
| 2009 | 8 | 58 |
| 2010 | 20 | 57 |
| 2011 | 34 | 63 |
| 2012 | 60 | 71 |
| 2013 | 57 | 89 |
| 2014 | 63 | 112 |
| 2015 | 97 | 157 |
| 2016 | 169 | 242 |
| 2017 | 270 | 346 |
| 2018 | 344 | 325 |
| 2019 | 399 | 383 |
| 2020 | 407 | 397 |
| 2021 | 322 | 367 |
| 2022 | 345 | 324 |
| 2023 | 317 | 374 |
| 2024 | 293 | 281 |
| 2025 | 271 | 268 |
| 2026 | 186 | 252 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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Most cited
By later US patents
- Localized projection of audible noises in medical settings525US 10,388,120 B2Masimo Corporation · 2019
- Shaping sound responsive to speaker orientation476US 9,042,556 B2Sonos, Inc. · 2015
- Characterizing environment using ultrasound pilot tones371US 9,319,816 B1Amazon Technologies, Inc. · 2016
- Speaker equalization for mobile devices370US 9,300,266 B2QUALCOMM Incorporated · 2016
- Automatic audio system equalizing357US 7,483,540 B2Bose Corporation · 2009