H04M 3/245
For isdn systems
Official title: {for ISDN systems}
H04M3/245 (For isdn systems) appears on 37 US grants and 5 published applications in this corpus.
Search patents in H04M- Granted patents
- 37
- Published applications
- 5
- Assignees
- 18
- Inventors
- 63
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 6 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 1 | 0 |
| 2006 | 1 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Automatic circuit configuration detection in legacy telephone networks10 Mar 2026US 12,574,286 B2AT&T Intellectual Property I, L. P.
- Handling audio path failure and poor quality of service for voice calls in a contact center19 Feb 2019US 10,212,200 B1Noble Systems Corporation
- Handling audio path failure and poor quality of service for voice calls in a contact center30 Jan 2018US 9,882,944 B1Noble Systems Corporation
- Handling audio path failure and poor quality of service for voice calls in a contact center27 Sep 2016US 9,456,076 B1Noble Systems Corporation
- Test device for data services8 Sep 2009US 7,587,029 B2British Telecommunications plc
- Automatic circuit configuration detection in legacy telephone networks26 Sep 2024US 2024/0323084 A1AT&T Intellectual Property I, L. P.
- Managing a Node that Provides Access to Both Broadband and Narrowband Service13 Nov 2008US 2008/0279180 A1
- Test device for data services10 Aug 2006US 2006/0176841 A1British Telecommunications plc
- Method and monitoring system for monitoring at least one subscriber line27 Feb 2003US 2003/0040890 A1Deutsche Telekom AG
- ISDN alarm notification system11 Apr 2002US 2002/0041569 A1Fujitsu Limited
Most cited
By later US patents
- Alarm and test system for a digital added main line169US 5,111,497 ARaychem Corporation · 1992
- Modular ISDN communication system with formation and display of error texts48US 5,036,318 ASiemens Aktiengesellschaft · 1991
- Quasi ground fault interruption signal-based activation of emergency pots by-pass paths for line-powered digital subscriber loop48US 6,757,382 B1Adtran, Inc. · 2004
- Maintenance communication control system in an ISDN service39US 5,375,117 AFujitsu Limited · 1994
- T carrier network test apparatus and method30US 5,166,925 A1992