H04M 15/24
Preventing metering of tax-free calls to certain lines
Official title: preventing metering of tax-free calls to certain lines, e.g. to fire or ambulance stations
H04M15/24 (Preventing metering of tax-free calls to certain lines) appears on 13 US grants and 12 published applications in this corpus.
Search patents in H04M- Granted patents
- 13
- Published applications
- 12
- Assignees
- 6
- Inventors
- 26
- Latest grant
- 20 Aug 2019
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 3 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 1 | 4 |
| 2015 | 1 | 1 |
| 2016 | 2 | 0 |
| 2017 | 3 | 1 |
| 2018 | 0 | 1 |
| 2019 | 2 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Application specific M2M billing reconciliation20 Aug 2019US 10,389,887 B2Aeris Communications, Inc.
- Packet-switched core network architecture for voice services on second- and third-generation wireless access networks16 Apr 2019US 10,263,797 B2T-Mobile USA, Inc.
- M2M billing reconciliation for the internet of things10 Oct 2017US 9,787,853 B1Aeris Communications, Inc.
- System and method for controlling advanced triggering operations in a telecommunication network2 May 2017US 9,641,958 B2Openet Telecom Ltd.
- Packet-switched core network architecture for voice services on second- and third-generation wireless access networks14 Feb 2017US 9,571,996 B2T-Mobile USA, Inc.
- Application specific m2m billing reconciliation25 Jan 2018US 2018/0027128 A1Aeris Communications, Inc.
- Packet-switched core network architecture for voice services on second- and third- generation wireless access networks3 Aug 2017US 2017/0222821 A1T-Mobile USA, Inc.
- System and Method for Providing Detection of Signaling-Only Engagements in a Telecommunication Network12 Nov 2015US 2015/0326736 A1Openet Telecom Ltd.
- Packet-switched core network architecture for voice services on second- and third-generation wireless access networks30 Oct 2014US 2014/0321456 A1T-Mobile USA, Inc.
- System and Method for Controlling Advanced Triggering Operations in a Telecommunication Network6 Feb 2014US 2014/0036774 A1Openet Telecom Ltd.
Most cited
By later US patents
- Billing for toll free calls terminating with a secondary telecommunications carrier16US 7,502,455 B2AT&T Intellectual Property I, L. P. · 2009
- System and method for providing detection of signaling-only engagements in a telecommunication network10US 9,125,076 B2Openet Telecom Ltd. · 2015
- System and method for controlling advanced triggering operations in a telecommunication network8US 9,516,449 B2Openet Telecom Ltd. · 2016
- Toll fraud control override6US 4,748,653 AAmerican Telephone and Telegraph Company, AT&T Bell Laboratories · 1988
- System and method for controlling advanced triggering operations in a telecommunication network6US 9,641,958 B2Openet Telecom Ltd. · 2017