H04M 3/2281
Call monitoring
Official title: {Call monitoring, e.g. for law enforcement purposes; Call tracing; Detection or prevention of malicious calls}
H04M3/2281 (Call monitoring) appears on 1,451 US grants and 1,408 published applications in this corpus.
Search patents in H04M- Granted patents
- 1,451
- Published applications
- 1,408
- Assignees
- 481
- Inventors
- 2,341
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 8 | 0 |
| 1997 | 8 | 0 |
| 1998 | 7 | 0 |
| 1999 | 23 | 0 |
| 2000 | 17 | 0 |
| 2001 | 18 | 11 |
| 2002 | 24 | 23 |
| 2003 | 21 | 34 |
| 2004 | 28 | 44 |
| 2005 | 18 | 44 |
| 2006 | 33 | 50 |
| 2007 | 36 | 53 |
| 2008 | 25 | 62 |
| 2009 | 33 | 60 |
| 2010 | 37 | 40 |
| 2011 | 40 | 45 |
| 2012 | 64 | 47 |
| 2013 | 60 | 45 |
| 2014 | 68 | 47 |
| 2015 | 69 | 76 |
| 2016 | 70 | 73 |
| 2017 | 97 | 83 |
| 2018 | 81 | 57 |
| 2019 | 92 | 67 |
| 2020 | 97 | 70 |
| 2021 | 72 | 74 |
| 2022 | 76 | 66 |
| 2023 | 74 | 66 |
| 2024 | 66 | 64 |
| 2025 | 53 | 49 |
| 2026 | 29 | 58 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Detection and methods for handling a TDOS attack6 Oct 2026US 12,756,776 B2Intrado Life & Safety, Inc.
- Systems and methods for blocking or allowing calls in a wireless network29 Sep 2026US 12,750,444 B2Verizon Patent and Licensing Inc.
- Call screening service for communication devices18 Aug 2026US 12,712,969 B1First Orion Corp.
- Active voice liveness detection system11 Aug 2026US 12,706,098 B2Pindrop Security, Inc.
- Systems and methods for JIP and CLLI matching in telecommunications metadata and machine-learning4 Aug 2026US 12,701,184 B2Pindrop Security, Inc.
- System and method for handling unwanted calls and messages24 Sep 2026US 2026/0292056 A1AT&T Intellectual Property I, L. P.
- System24 Sep 2026US 2026/0292057 A1SoftBank Group Corp.
- System24 Sep 2026US 2026/0292058 A1SoftBank Group Corp.
- A method and system for caller risk scoring using stir/shaken data17 Sep 2026US 2026/0281128 A1Vail Systems, Inc.
- Call classification through analysis of dtmf events17 Sep 2026US 2026/0281227 A1Pindrop Security, Inc.
Most cited
By later US patents
- Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access584US 7,106,843 B1T-Netix, Inc. · 2006
- Method and system for monitoring call center service representatives378US 6,058,163 ATeknekron Infoswitch Corporation · 2000
- Dynamic display of real time speech analytics agent alert indications in a contact center329US 9,160,853 B1Noble Systems Corporation · 2015
- Method and system for automatically monitoring the performance quality of call center service representatives323US 5,535,256 ATeknekron Infoswitch Corporation · 1996
- Computer-based method and apparatus for controlling, monitoring, recording and reporting telephone access312US 5,655,013 A1997