H03F 1/3264
In audio amplifiers
Official title: {in audio amplifiers}
H03F1/3264 (In audio amplifiers) appears on 142 US grants and 101 published applications in this corpus.
Search patents in H03F- Granted patents
- 142
- Published applications
- 101
- Assignees
- 69
- Inventors
- 179
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 12 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 5 |
| 2003 | 3 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 2 |
| 2006 | 1 | 3 |
| 2007 | 2 | 5 |
| 2008 | 1 | 5 |
| 2009 | 2 | 2 |
| 2010 | 5 | 2 |
| 2011 | 3 | 0 |
| 2012 | 2 | 1 |
| 2013 | 0 | 2 |
| 2014 | 0 | 2 |
| 2015 | 2 | 0 |
| 2016 | 1 | 3 |
| 2017 | 2 | 0 |
| 2018 | 3 | 8 |
| 2019 | 6 | 5 |
| 2020 | 10 | 16 |
| 2021 | 13 | 10 |
| 2022 | 7 | 11 |
| 2023 | 9 | 8 |
| 2024 | 7 | 6 |
| 2025 | 3 | 1 |
| 2026 | 7 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electret microphone4 Aug 2026US 12,701,367 B2Sennheiser electronic GmbH & Co. KG
- Amplifier with adjustable characteristic and method for adjusting the characteristic of amplifier16 Jun 2026US 12,658,861 B2Roland Corporation
- Circuit and method for compensating non-linearities16 Jun 2026US 12,658,898 B2Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
- Low noise readout interface for capacitive sensors with negative capacitance14 Apr 2026US 12,601,774 B2InvenSense, Inc.
- Speaker distortion correction device3 Mar 2026US 12,567,838 B2Alps Alpine Co., Ltd.
- Self-oscillating class-d amplifier device9 Apr 2026US 2026/0100682 A1Hypex Holding B.V.
- Monitoring of inductor behavior2 Apr 2026US 2026/0095129 A1Cirrus Logic International Semiconductor Ltd.
- Non-linear function in an early-sampled hybrid multi-level converter amplifier system19 Mar 2026US 2026/0081572 A1Cirrus Logic International Semiconductor Ltd.
- Hearing device comprising an amplifier system for minimizing variation in an acoustical signal caused by variation in gain of an amplifier6 Feb 2025US 2025/0048040 A1Oticon A/S
- Speaker distortion correction device3 Oct 2024US 2024/0333232 A1Alps Alpine Co., Ltd.
Most cited
By later US patents
- Digital signal processing for linearization of small input signals to a tri-state power switch176US 5,617,058 AApogee Technology, Inc. · 1997
- Systems and methods for improving performance in a digital amplifier by adding an ultrasonic signal to an input audio signal118US 7,649,410 B2D2Audio Corporation · 2010
- Digital amplifier86US 7,907,010 B2NXP B. V. · 2011
- Tube modeling programmable digital guitar amplification system79US 5,789,689 A1998
- Audio amplifier65US 4,797,633 AVideo Sound, Inc. · 1989