H04R 3/007
Protection circuits for transducers
Official title: {Protection circuits for transducers}
H04R3/007 (Protection circuits for transducers) appears on 917 US grants and 985 published applications in this corpus.
Search patents in H04R- Granted patents
- 917
- Published applications
- 985
- Assignees
- 381
- Inventors
- 1,721
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 6 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 6 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 6 |
| 2004 | 1 | 3 |
| 2005 | 9 | 13 |
| 2006 | 6 | 9 |
| 2007 | 6 | 9 |
| 2008 | 2 | 18 |
| 2009 | 6 | 11 |
| 2010 | 5 | 24 |
| 2011 | 11 | 31 |
| 2012 | 16 | 39 |
| 2013 | 26 | 44 |
| 2014 | 25 | 37 |
| 2015 | 47 | 51 |
| 2016 | 67 | 72 |
| 2017 | 90 | 97 |
| 2018 | 98 | 76 |
| 2019 | 95 | 77 |
| 2020 | 76 | 69 |
| 2021 | 49 | 58 |
| 2022 | 59 | 56 |
| 2023 | 45 | 50 |
| 2024 | 58 | 64 |
| 2025 | 39 | 32 |
| 2026 | 32 | 37 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Auto-recovery overcurrent protection for audio notification appliance circuit in fire protection system6 Oct 2026US 12,756,974 B2Tyco Fire & Security GmbH
- Methods and apparatus to protect circuitry from overcurrent conditions22 Sep 2026US 12,744,375 B2Texas Instruments Incorporated
- Voltage and current sense circuits for measuring a load connected to a power amplifier25 Aug 2026US 12,716,920 B2Goodix Technology (Hk) Company Limited
- Electronic device having multiple speakers controlled by a single functional chip11 Aug 2026US 12,707,200 B2Richtek Technology Corporation
- IP speaker system11 Aug 2026US 12,707,213 B1Algo Communication Products Ltd.
- Predictive Signal Correction1 Oct 2026US 2026/0304030 A1Sonos, Inc.
- Speaker protection techniques1 Oct 2026US 2026/0304037 A1Harman Becker Automotive Systems GmbH
- System and method for preventing damage to switches for an amplifier in a vehicle24 Sep 2026US 2026/0291204 A1Harman Becker Automotive Systems GmbH
- Method and system for mechanical protection and nonlinear compensation of loudspeaker systems24 Sep 2026US 2026/0292398 A1Harman International Industries, Incorporated
- Audio bus line fault protection circuitry10 Sep 2026US 2026/0266895 A1Analog Devices International Unlimited Company
Most cited
By later US patents
- Loudspeaker overload protection circuit293US 4,296,278 AAltec Corporation · 1981
- Sound control circuit for a digital audiovisual reproduction system189US 6,898,161 B1TouchTunes Music Corporation · 2005
- System for controlling displacement of a loudspeaker176US 9,374,634 B2NXP B. V. · 2016
- Method of controlling diaphragm excursion of electrodynamic loudspeakers175US 9,813,812 B2Analog Devices Global · 2017
- Direct measurement of an input signal to a loudspeaker to determine and limit a temperature of a voice coil of the loudspeaker172US 9,510,101 B1Maxim Integrated Products, Inc. · 2016