H04M 7/1295
Details of dual tone multiple frequency signalling
Official title: {Details of dual tone multiple frequency signalling}
H04M7/1295 (Details of dual tone multiple frequency signalling) appears on 450 US grants and 392 published applications in this corpus.
Search patents in H04M- Granted patents
- 450
- Published applications
- 392
- Assignees
- 219
- Inventors
- 763
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 8 | 0 |
| 1998 | 10 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 20 | 11 |
| 2002 | 19 | 24 |
| 2003 | 15 | 36 |
| 2004 | 22 | 34 |
| 2005 | 18 | 32 |
| 2006 | 27 | 32 |
| 2007 | 26 | 17 |
| 2008 | 10 | 21 |
| 2009 | 15 | 7 |
| 2010 | 22 | 12 |
| 2011 | 14 | 17 |
| 2012 | 21 | 7 |
| 2013 | 18 | 14 |
| 2014 | 28 | 10 |
| 2015 | 12 | 14 |
| 2016 | 19 | 19 |
| 2017 | 21 | 18 |
| 2018 | 16 | 11 |
| 2019 | 16 | 12 |
| 2020 | 14 | 6 |
| 2021 | 8 | 10 |
| 2022 | 7 | 8 |
| 2023 | 9 | 6 |
| 2024 | 10 | 10 |
| 2025 | 6 | 2 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- System and method for securely delivering information17 Jun 2025US 12,335,429 B2Syntec Holdings Limited
- Systems and techniques for authentication and security22 Apr 2025US 12,284,271 B2QUALCOMM Incorporated
- Call classification through analysis of dtmf events17 Sep 2026US 2026/0281227 A1Pindrop Security, Inc.
- Systems and Methods for Automated Call Acceptance of Facility-Originated Telephone Calls with Prerecorded Preambles26 Mar 2026US 2026/0089257 A1
- System And Methods For Automated Customer Response System Mapping And Duplication8 May 2025US 2025/0150531 A1Cyara Solutions Pty Ltd
- Chatbot and search engine integration9 Jan 2025US 2025/0016267 A1Cyara Solutions Pty Ltd
- Telephone signal processing24 Oct 2024US 2024/0357040 A1Sycurio Limited
Most cited
By later US patents
- Streaming content over a telephone interface588US 6,970,915 B1TellMe Networks, Inc. · 2005
- okApparatus for a voice over IP (voIP) telephony gateway and methods for use therein511US 6,363,065 B1Quintum Technologies, Inc. · 2002
- Systems and methods for providing unified multimedia communication services484US 6,782,412 B2Verizon Laboratories Inc. · 2004
- Network based distributed PBX system407US 5,742,596 APhonet Communication Ltd. · 1998
- Computer-based multifunction personal communications system375US 5,452,289 AMulti-Tech Systems, Inc. · 1995