H04M 9/00
Arrangements for interconnection not involving centralised switching
H04M9/00 (Arrangements for interconnection not involving centralised switching) appears on 2,825 US grants and 1,905 published applications in this corpus.
Search patents in H04M- Granted patents
- 2,825
- Published applications
- 1,905
- Assignees
- 863
- Inventors
- 4,203
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 45 | 0 |
| 1977 | 40 | 0 |
| 1978 | 30 | 0 |
| 1979 | 24 | 0 |
| 1980 | 16 | 0 |
| 1981 | 18 | 0 |
| 1982 | 23 | 0 |
| 1983 | 21 | 0 |
| 1984 | 19 | 0 |
| 1985 | 45 | 0 |
| 1986 | 39 | 0 |
| 1987 | 41 | 0 |
| 1988 | 46 | 0 |
| 1989 | 34 | 0 |
| 1990 | 33 | 0 |
| 1991 | 50 | 0 |
| 1992 | 26 | 0 |
| 1993 | 32 | 0 |
| 1994 | 30 | 0 |
| 1995 | 47 | 0 |
| 1996 | 52 | 0 |
| 1997 | 66 | 0 |
| 1998 | 84 | 0 |
| 1999 | 67 | 0 |
| 2000 | 37 | 0 |
| 2001 | 48 | 17 |
| 2002 | 44 | 54 |
| 2003 | 56 | 57 |
| 2004 | 54 | 65 |
| 2005 | 46 | 65 |
| 2006 | 80 | 75 |
| 2007 | 42 | 123 |
| 2008 | 54 | 118 |
| 2009 | 40 | 92 |
| 2010 | 54 | 85 |
| 2011 | 74 | 58 |
| 2012 | 126 | 66 |
| 2013 | 99 | 81 |
| 2014 | 89 | 85 |
| 2015 | 111 | 88 |
| 2016 | 113 | 76 |
| 2017 | 110 | 77 |
| 2018 | 85 | 86 |
| 2019 | 97 | 106 |
| 2020 | 106 | 83 |
| 2021 | 56 | 78 |
| 2022 | 85 | 66 |
| 2023 | 46 | 70 |
| 2024 | 49 | 61 |
| 2025 | 62 | 46 |
| 2026 | 34 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04M 9/08Two-way loud-speaking telephone systems with means for conditioning the signal1,976
- H04M 9/002Arrangements for interconnection not involving centralised switching: with subscriber controlled access to386
- H04M 9/02Involving a common line for all parties346
- H04M 9/001Two-way communication systems between a limited number of parties62
- H04M 9/04Involving a separate line for each pair of parties12
- H04M 9/06Involving combinations of interconnecting lines6
Recent patents
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- Tone and echo cancellation using two acoustic sound cancellers1 Sep 2026US 12,725,614 B2Sonos, Inc.
- Wearable device with speech enhancement25 Aug 2026US 12,718,830 B2Bose Corporation
- Multi-channel echo cancellation method and related apparatus25 Aug 2026US 12,720,258 B2Tencent Technology (Shenzhen) Company Limited
- Wideband doubletalk detection for optimization of acoustic echo cancellation1 Oct 2026US 2026/0303727 A1Shure Acquisition Holdings, Inc.
- System and method for automatic adjustment of reference gain24 Sep 2026US 2026/0291458 A1Shure Acquisition Holdings, Inc.
- Voice authentication based on background audio3 Sep 2026US 2026/0261614 A1Wells Fargo Bank, N. A.
- Echo suppressor for use in two-way voice communication3 Sep 2026US 2026/0261617 A1GN Hearing A/S
- Cloud-Based Call Routing Using a Unified Directory13 Aug 2026US 2026/0238518 A1Zoom Communications, Inc.
Most cited
By later US patents
- Audio distribution system having programmable zoning features1,660US 5,761,320 AElan Home Systems, L.L.C. · 1998
- Audio distribution system having programmable zoning features1,643US 5,440,644 ASquare D Company · 1995
- Network based distributed PBX system407US 5,742,596 APhonet Communication Ltd. · 1998
- Method and apparatus for multi-channel audio processing using single-channel components378US 8,233,632 B1Google Inc. · 2012
- Small array microphone for acoustic echo cancellation and noise suppression373US 7,003,099 B1Fortmedia, Inc. · 2006