H04M 3/40
Applications of speech amplifiers
H04M3/40 (Applications of speech amplifiers) appears on 128 US grants and 59 published applications in this corpus.
Search patents in H04M- Granted patents
- 128
- Published applications
- 59
- Assignees
- 85
- Inventors
- 267
- Latest grant
- 25 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 5 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 10 | 0 |
| 1999 | 9 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 0 |
| 2002 | 5 | 6 |
| 2003 | 2 | 1 |
| 2004 | 2 | 2 |
| 2005 | 2 | 7 |
| 2006 | 4 | 12 |
| 2007 | 3 | 3 |
| 2008 | 3 | 1 |
| 2009 | 3 | 0 |
| 2010 | 2 | 1 |
| 2011 | 1 | 4 |
| 2012 | 2 | 0 |
| 2013 | 0 | 2 |
| 2014 | 4 | 2 |
| 2015 | 3 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 1 | 1 |
| 2020 | 4 | 3 |
| 2021 | 2 | 3 |
| 2022 | 4 | 4 |
| 2023 | 1 | 3 |
| 2024 | 1 | 2 |
| 2025 | 2 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and system for volume control25 Nov 2025US 12,481,476 B2Apple Inc.
- Conversational service4 Mar 2025US 12,243,546 B2Nokia Technologies Oy
- Voice filtering other speakers from calls and audio messages10 Sep 2024US 12,087,297 B2Google Inc.
- Method and apparatus for sound enhancement31 Jan 2023US 11,570,553 B2Jiangsu aidiSciTech Reseach Institute Co., Ltd.
- Voice filtering other speakers from calls and audio messages4 Oct 2022US 11,462,219 B2Google Inc.
- Method for protecting communications from sound leakages12 Feb 2026US 2026/0044306 A1Unify Beteiligungsverwaltung GmbH & Co. KG
- Data processing method and apparatus31 Oct 2024US 2024/0364757 A1Samsung Electronics Co., Ltd.
- Acoustic feedback management in real-time audio communication1 Feb 2024US 2024/0040043 A1Dolby Laboratories Licensing Corporation
- Conversational Service8 Jun 2023US 2023/0178090 A1Nokia Technologies Oy
- Method and system for volume control12 Jan 2023US 2023/0008865 A1Apple Inc.
Most cited
By later US patents
- Teleconferencing audio bridge122US 6,178,237 B1Lucent Technologies Inc. · 2001
- System and method for monitoring audio power level of agent speech in a telephonic switch109US 5,712,954 ARockwell International Corporation · 1998
- Normalization of calling party sound levels on a conference bridge103US 5,724,416 AAT&T Corp. · 1998
- Employing customer premises equipment in communications network maintenance83US 6,453,153 B1AT&T Corp. · 2002
- Wireless telephone headset system with automatic log on/log off detection64US 5,991,645 AGN Netcom, Inc. · 1999