H04M 3/2272
Subscriber line supervision circuits
Official title: {Subscriber line supervision circuits, e.g. call detection circuits}
H04M3/2272 (Subscriber line supervision circuits) appears on 331 US grants and 134 published applications in this corpus.
Search patents in H04M- Granted patents
- 331
- Published applications
- 134
- Assignees
- 150
- Inventors
- 461
- Latest grant
- 14 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 4 | 0 |
| 1981 | 5 | 0 |
| 1982 | 9 | 0 |
| 1983 | 0 | 0 |
| 1984 | 6 | 0 |
| 1985 | 9 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 7 | 0 |
| 1989 | 4 | 0 |
| 1990 | 6 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 9 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 21 | 0 |
| 1999 | 11 | 0 |
| 2000 | 2 | 0 |
| 2001 | 8 | 4 |
| 2002 | 9 | 14 |
| 2003 | 10 | 15 |
| 2004 | 11 | 5 |
| 2005 | 9 | 12 |
| 2006 | 16 | 12 |
| 2007 | 11 | 11 |
| 2008 | 8 | 8 |
| 2009 | 2 | 5 |
| 2010 | 12 | 1 |
| 2011 | 9 | 7 |
| 2012 | 8 | 2 |
| 2013 | 8 | 2 |
| 2014 | 7 | 2 |
| 2015 | 6 | 4 |
| 2016 | 7 | 3 |
| 2017 | 8 | 0 |
| 2018 | 8 | 4 |
| 2019 | 12 | 1 |
| 2020 | 3 | 1 |
| 2021 | 4 | 3 |
| 2022 | 2 | 2 |
| 2023 | 4 | 7 |
| 2024 | 5 | 4 |
| 2025 | 3 | 3 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Provisioning tool—call center-based automated interface with network switches for internet service diagnostics and provisioning14 Oct 2025US 12,445,553 B2CenturyLink Intellectual Property LLC
- Automate-automated interface between call center agents and network orchestration systems via application programming interfaces (APIs)5 Aug 2025US 12,381,974 B2CenturyLink Intellectual Property LLC
- Auto switch—call center-based automated interface with voice switches for voice service diagnostics and provisioning22 Apr 2025US 12,284,316 B2CenturyLink Intellectual Property LLC
- Conditional communication forwarding based on origination and destination attributes29 Oct 2024US 12,132,860 B2First Orion Corp.
- Auto switch-call center-based automated interface with voice switches for voice service diagnostics and provisioning28 May 2024US 11,997,233 B2CenturyLink Intellectual Proper LLC
- Systems for call monitoring and associated methods using call arrival intervals23 Apr 2026US 2026/0113401 A1Avoxi, Inc.
- Provisioning tool -- call center-based automated interface with network switches for internet service diagnostics and provisioning5 Feb 2026US 2026/0039744 A1CenturyLink Intellectual Property LLC
- Automate-automated interface between call center agents and network orchestration systems via application programming interfaces (apis)20 Nov 2025US 2025/0358362 A1CenturyLink Intellectual Property LLC
- Auto switch - call center-based automated interface with voice switches for voice service diagnostics and provisioning31 Jul 2025US 2025/0247470 A1CenturyLink Intellectual Property LLC
- Test of a Communication Interface Connected to an Analog Telephone Line29 May 2025US 2025/0175553 A1Sagemcom Broadband SAS
Most cited
By later US patents
- Signal monitoring apparatus for analyzing communications286US 6,404,857 B1Eyretel Limited · 2002
- Signal monitoring apparatus analyzing voice communication content238US 6,757,361 B2Eyretel Limited · 2004
- Voice integrated VOIP system220US 7,095,733 B1Yahoo! Inc. · 2006
- Method and apparatus for detecting an attempted three-way conference call on a remote telephone179US 5,539,812 A1996
- Emulation of phone extensions in a packet telephony distribution system114US 6,697,358 B22Wire, Inc. · 2004