H04R 3/02
Circuits for transducers: for preventing acoustic reaction , i.e. acoustic oscillatory feedback
Official title: for preventing acoustic reaction {, i.e. acoustic oscillatory feedback (specially adapted for hearing aids H04R25/453)}
H04R3/02 (Circuits for transducers: for preventing acoustic reaction , i.e. acoustic oscillatory feedback) appears on 1,128 US grants and 1,214 published applications in this corpus.
Search patents in H04R- Granted patents
- 1,128
- Published applications
- 1,214
- Assignees
- 486
- Inventors
- 2,078
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 5 | 0 |
| 1998 | 10 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 0 |
| 2002 | 6 | 7 |
| 2003 | 4 | 14 |
| 2004 | 6 | 12 |
| 2005 | 3 | 15 |
| 2006 | 12 | 25 |
| 2007 | 11 | 22 |
| 2008 | 4 | 18 |
| 2009 | 8 | 25 |
| 2010 | 14 | 34 |
| 2011 | 17 | 26 |
| 2012 | 39 | 30 |
| 2013 | 31 | 57 |
| 2014 | 34 | 69 |
| 2015 | 54 | 60 |
| 2016 | 79 | 41 |
| 2017 | 66 | 45 |
| 2018 | 50 | 56 |
| 2019 | 57 | 65 |
| 2020 | 74 | 66 |
| 2021 | 62 | 114 |
| 2022 | 116 | 101 |
| 2023 | 104 | 116 |
| 2024 | 83 | 76 |
| 2025 | 67 | 69 |
| 2026 | 48 | 51 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Sound reproducing apparatus and sound reproducing method303US 8,160,281 B2Samsung Electronics Co., Ltd. · 2012
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