H04Q 2213/13222
Pbx circuits in public exchange, centrex
Official title: PBX circuits in public exchange, centrex
H04Q2213/13222 (Pbx circuits in public exchange, centrex) appears on 102 US grants and 36 published applications in this corpus.
Search patents in H04Q- Granted patents
- 102
- Published applications
- 36
- Assignees
- 43
- Inventors
- 141
- Latest grant
- 1 Jan 2019
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 13 | 0 |
| 1998 | 12 | 0 |
| 1999 | 14 | 0 |
| 2000 | 9 | 0 |
| 2001 | 7 | 2 |
| 2002 | 4 | 6 |
| 2003 | 8 | 6 |
| 2004 | 3 | 8 |
| 2005 | 3 | 3 |
| 2006 | 2 | 1 |
| 2007 | 3 | 3 |
| 2008 | 1 | 4 |
| 2009 | 2 | 0 |
| 2010 | 0 | 1 |
| 2011 | 2 | 0 |
| 2012 | 2 | 0 |
| 2013 | 1 | 1 |
| 2014 | 2 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and system for managing internal and external calls for a group of communication clients sharing a common customer identifier1 Jan 2019US 10,171,889 B2Bce Inc.
- Operating a network node24 Oct 2017US 9,800,957 B2Metaswitch Networks Ltd.
- Method and apparatus for ubiquitous access to dialing plans for enterprise networks10 Jun 2014US 8,750,479 B2AT&T Intellectual Property II, L. P.
- Method for dial plan parsing and a system incorporating the same18 Feb 2014US 8,654,966 B2AudioCodes Ltd.
- Method and system of providing on-network communication services19 Feb 2013US 8,380,210 B2Verizon New Jersey Inc.
- Operating a network node23 Feb 2017US 2017/0055047 A1Metaswitch Networks Ltd.
- Method and apparatus for ubiquitous access to dialing plans for enterprise networks18 Apr 2013US 2013/0094645 A1AT&T Corp.
- Method and system for managing internal and external calls for a group of communication clients sharing a common customer identifier2 Sep 2010US 2010/0220714 A1Bce Inc.
- Remote redundant voice server system30 Oct 2008US 2008/0267062 A1Net2Phone, Inc.
- System and method for selectively coupling various communication devices through common channel4 Sep 2008US 2008/0212570 A1
Most cited
By later US patents
- Personal communications service using wireline/wireless integration592US 5,353,331 ABell Atlantic Network Services, Inc. · 1994
- Area wide centrex423US 5,247,571 ABell Atlantic Network Services, Inc. · 1993
- Telephone control system with branch routing343US 5,375,161 AAccessLine Technologies, Inc. · 1994
- Personal communications service using wireline/wireless integration249US 5,758,281 ABell Atlantic Network Services, Inc. · 1998
- Personal communications service using wireline/wireless integration236US 5,610,972 ABell Atlantic Network Services, Inc. · 1997