H04M 3/42314
In private branch exchanges
Official title: {in private branch exchanges}
H04M3/42314 (In private branch exchanges) appears on 1,849 US grants and 1,306 published applications in this corpus.
Search patents in H04M- Granted patents
- 1,849
- Published applications
- 1,306
- Assignees
- 571
- Inventors
- 2,527
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 8 | 0 |
| 1989 | 7 | 0 |
| 1990 | 11 | 0 |
| 1991 | 8 | 0 |
| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 11 | 0 |
| 1995 | 16 | 0 |
| 1996 | 26 | 0 |
| 1997 | 37 | 0 |
| 1998 | 52 | 0 |
| 1999 | 99 | 0 |
| 2000 | 65 | 0 |
| 2001 | 97 | 49 |
| 2002 | 90 | 117 |
| 2003 | 97 | 100 |
| 2004 | 102 | 94 |
| 2005 | 59 | 98 |
| 2006 | 87 | 80 |
| 2007 | 64 | 93 |
| 2008 | 52 | 96 |
| 2009 | 61 | 77 |
| 2010 | 65 | 73 |
| 2011 | 56 | 68 |
| 2012 | 95 | 55 |
| 2013 | 105 | 61 |
| 2014 | 86 | 47 |
| 2015 | 69 | 38 |
| 2016 | 52 | 31 |
| 2017 | 55 | 25 |
| 2018 | 38 | 19 |
| 2019 | 27 | 19 |
| 2020 | 36 | 21 |
| 2021 | 18 | 9 |
| 2022 | 23 | 12 |
| 2023 | 22 | 10 |
| 2024 | 9 | 5 |
| 2025 | 14 | 6 |
| 2026 | 5 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Control of communication services management6 Oct 2026US 12,756,778 B2G.S. Consulting & Research Correnet Ltd
- Identifying and processing, for priority, calls in data communications server8 Sep 2026US 12,732,579 B18x8, Inc.
- Exchange, and telephone exchange method25 Aug 2026US 12,719,983 B2NEC Platforms, Ltd.
- Private branch exchange high availability server18 Aug 2026US 12,712,966 B1Zoom Communications, Inc.
- Wireless security network and communication methods23 Jun 2026US 12,666,352 B2A9 com, Inc.
- Computing resource management based on determining a number of discrete users of a shared communication channel15 Jan 2026US 2026/0019461 A1Microsoft Technology Licensing, LLC
- Client Control Via Third Party Application15 Jan 2026US 2026/0019463 A1Zoom Communications, Inc.
- Device Management System1 Jan 2026US 2026/0005921 A1Zoom Communications, Inc.
- Secure call routing system27 Nov 2025US 2025/0365372 A1
- Hybrid Cloud PBX16 Oct 2025US 2025/0324000 A1
Most cited
By later US patents
- System, method and article of manufacture for communications utilizing calling, plans in a hybrid network1,175US 5,867,495 AMCI Communications Corporations · 1999
- System for coordinating communications via customer contact channel changing system using call centre for setting up the call between customer and an available help agent953US 5,884,032 AThe New Brunswick Telephone Company, Limited · 1999
- System, method and article of manufacture with integrated video conferencing billing in a communication system architecture751US 5,867,494 AMCI Communication Corporation · 1999
- Multimedia collaboration system with separate data network and A/V network controlled by information transmitting on the data network741US 5,617,539 AVicor Corporation · 1997
- Call management system with call control from user workstation computers734US 5,946,386 AXantel Corporation · 1999