H04M 3/18
Automatic or semi-automatic exchanges: with means for reducing interference or noise
Official title: with means for reducing interference {or noise}; with means for reducing effects due to line faults {with means for protecting lines}
H04M3/18 (Automatic or semi-automatic exchanges: with means for reducing interference or noise) appears on 442 US grants and 231 published applications in this corpus.
Search patents in H04M- Granted patents
- 442
- Published applications
- 231
- Assignees
- 225
- Inventors
- 762
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 4 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 6 | 0 |
| 1987 | 6 | 0 |
| 1988 | 8 | 0 |
| 1989 | 11 | 0 |
| 1990 | 10 | 0 |
| 1991 | 9 | 0 |
| 1992 | 5 | 0 |
| 1993 | 12 | 0 |
| 1994 | 5 | 0 |
| 1995 | 8 | 0 |
| 1996 | 16 | 0 |
| 1997 | 17 | 0 |
| 1998 | 18 | 0 |
| 1999 | 14 | 0 |
| 2000 | 20 | 0 |
| 2001 | 19 | 2 |
| 2002 | 16 | 12 |
| 2003 | 13 | 19 |
| 2004 | 17 | 24 |
| 2005 | 18 | 12 |
| 2006 | 16 | 12 |
| 2007 | 7 | 12 |
| 2008 | 8 | 7 |
| 2009 | 6 | 13 |
| 2010 | 8 | 6 |
| 2011 | 9 | 12 |
| 2012 | 10 | 15 |
| 2013 | 15 | 17 |
| 2014 | 29 | 11 |
| 2015 | 13 | 13 |
| 2016 | 14 | 8 |
| 2017 | 7 | 7 |
| 2018 | 7 | 4 |
| 2019 | 10 | 2 |
| 2020 | 5 | 4 |
| 2021 | 4 | 6 |
| 2022 | 1 | 4 |
| 2023 | 3 | 3 |
| 2024 | 5 | 3 |
| 2025 | 2 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Receive-side audio processing for calls in a web conferencing client11 Aug 2026US 12,706,111 B2Cisco Technology, Inc.
- Frontend audio capture for video conferencing applications25 Nov 2025US 12,482,486 B2Zoom Communications, Inc.
- Technologies for video conferencing3 Jun 2025US 12,323,558 B2Intel Corporation
- Adjusting transmit audio at near-end device based on background noise at far-end device26 Nov 2024US 12,155,789 B2Motorola Mobility LLC
- Methods and systems for automatic call data generation18 Jun 2024US 12,014,144 B2Intuit Inc.
- Method and system for ai-based utterance recognition refinement in interactive voice response system13 Aug 2026US 2026/0238719 A1Bank of America Corporation
- Frontend audio capture26 Feb 2026US 2026/0057901 A1Zoom Communications, Inc.
- Receive-side audio processing for calls in a web conferencing client24 Apr 2025US 2025/0131936 A1Cisco Technology, Inc.
- Audio adjustment based on colocation of users17 Oct 2024US 2024/0348719 A1Meta Platforms Technologies, LLC
- Position detection method, apparatus, electronic device and computer readable storage medium13 Jun 2024US 2024/0194220 A1Samsung Electronics Co., Ltd.
Most cited
By later US patents
- Systems and methods for making emergency phone calls149US 9,516,485 B1Civiq Smartscapes, LLC · 2016
- Noise reduction techniques and apparatus for enhancing wireless data network telephony126US 6,078,566 AGenesys Telecommunications Laboratories, Inc. · 2000
- Method and apparatus for remote powering of device connected to network112US 6,762,675 B1Cisco Technology, Inc. · 2004
- Surge suppressor101US 6,188,557 B1TII Industries, Inc. · 2001
- Surge suppressor87US 6,252,754 B1TZI Industries, Inc. · 2001