H04M 2203/055
Loopback testing
Official title: loopback testing
H04M2203/055 (Loopback testing) appears on 26 US grants and 21 published applications in this corpus.
Search patents in H04M- Granted patents
- 26
- Published applications
- 21
- Assignees
- 28
- Inventors
- 69
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 4 |
| 2003 | 0 | 0 |
| 2004 | 1 | 3 |
| 2005 | 2 | 2 |
| 2006 | 3 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 4 |
| 2010 | 1 | 1 |
| 2011 | 0 | 0 |
| 2012 | 2 | 2 |
| 2013 | 3 | 0 |
| 2014 | 2 | 0 |
| 2015 | 1 | 1 |
| 2016 | 0 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Detecting modem power state change30 Dec 2025US 12,513,240 B2British Telecommunications Public Ltd.Co.
- Transmission system, relay apparatus, transmission terminal, and transmission terminal control program6 Jun 2017US 9,674,487 B2Ricoh Company, Ltd.
- Method and system for performing SIP loopback in communication devices17 Feb 2015US 8,958,312 B2ARRIS Enterprises LLC
- Method and apparatus for verifying signaling and bearer channels in a packet switched network1 Jul 2014US 8,767,566 B2Tellabs Vienna, Inc.
- Real time measurement of network delay3 Jun 2014US 8,743,707 B2Verizon Patent and Licensing Inc.
- Detecting modem power state change8 Aug 2024US 2024/0267456 A1British Telecommunications Public Ltd.Co.
- System, method and device for testing call quality19 Apr 2018US 2018/0109337 A1Beijing Xiaomi Mobile Software Co., Ltd.
- Transmission system, relay apparatus, transmission terminal, and transmission terminal control program1 Oct 2015US 2015/0281646 A1Ricoh Company, Ltd.
- Test system for voice communications systems24 May 2012US 2012/0128134 A1Ipc Systems, Inc.
- Anti-looping for a multigateway multi-carrier network22 Mar 2012US 2012/0069980 A1IntelePeer, Inc.
Most cited
By later US patents
- Apparatus and method for testing and fault isolation in a communication network160US 8,472,327 B2Verizon Business Global LLC · 2013
- Employing customer premises equipment in communications network maintenance83US 6,453,153 B1AT&T Corp. · 2002
- Portable telecommunication network testing device54US 5,892,756 AMTB Insights, Incorporated · 1999
- Way finding with an interactive faceplate44US 6,163,595 ANortel Networks Limited · 2000
- Method to pre-qualify copper loops for ADSL service20US 6,349,130 B1Lucent Technologies Inc. · 2002