H04M 7/14
In systems involving main and subordinate switching centres
Official title: in systems involving main and subordinate switching centres
H04M7/14 (In systems involving main and subordinate switching centres) appears on 21 US grants and 9 published applications in this corpus.
Search patents in H04M- Granted patents
- 21
- Published applications
- 9
- Assignees
- 16
- Inventors
- 37
- Latest grant
- 2 Oct 2012
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 3 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 2 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 3 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Virtual PBX based on feature server modules2 Oct 2012US 8,279,857 B2Resource Consortium Limited
- Virtual PBX based on feature server modules29 Jun 2010US 7,746,848 B2Resource Consortium Limited
- Method for selecting impedance setting for loop start trunk line15 Jun 2010US 7,738,653 B2Mitel Networks Corporation
- Switch proxy for providing emergency stand alone service in remote access systems16 Mar 2010US 7,680,252 B2Aztek Engineering, Inc.
- Method of selecting impedance setting for loop start trunk line8 May 2007US 7,215,762 B2Mitel Networks Corporation
- Virtual pbx based on feature server modules7 Sep 2017US 2017/0257252 A1Resource Consortium Limited
- Virtual PBX based on Feature Server Modules3 Jan 2013US 2013/0003723 A1Resource Consortium Limited
- Virtual PBX based on Feature Server Modules30 Sep 2010US 2010/0246575 A1Resource Consortium Limited
- Method for selecting impedance setting for loop start trunk line7 Jun 2007US 2007/0127697 A1Mitel Networks Corporation
- Virtual PBX based on feature server modules1 Mar 2007US 2007/0047534 A1Resource Consortium Limited
Most cited
By later US patents
- Method and apparatus for the billing of value-added communication calls298US 5,003,584 AAT&T Bell Laboratories · 1991
- Interface to and operation of a voice messaging system140US 4,926,462 AVmx/Opcom · 1990
- Method and apparatus for teleworking from remote terminals52US 5,991,390 ABritish Telecommunications Public Ltd.Co. · 1999
- Method for personal paging a telephone private branch exchange with the assistance of a personal paging device that offers mutually different operating modes for personal paging49US 5,151,930 ASiemens Aktiengesellschaft · 1992
- Method of making call-wait and call-alternation in electronic private branch exchange (EPBX)44US 4,975,944 ASamsung Electronics Co., Ltd. · 1990