H04M 1/654
Telephone line monitoring circuits therefor
Official title: Telephone line monitoring circuits therefor, e.g. ring detectors
H04M1/654 (Telephone line monitoring circuits therefor) appears on 158 US grants and 29 published applications in this corpus.
Search patents in H04M- Granted patents
- 158
- Published applications
- 29
- Assignees
- 77
- Inventors
- 228
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 7 | 0 |
| 1987 | 3 | 0 |
| 1988 | 5 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 7 | 0 |
| 1993 | 7 | 0 |
| 1994 | 4 | 0 |
| 1995 | 6 | 0 |
| 1996 | 11 | 0 |
| 1997 | 11 | 0 |
| 1998 | 12 | 0 |
| 1999 | 9 | 0 |
| 2000 | 7 | 0 |
| 2001 | 5 | 4 |
| 2002 | 7 | 1 |
| 2003 | 2 | 3 |
| 2004 | 6 | 3 |
| 2005 | 1 | 1 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 1 |
| 2009 | 1 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 1 |
| 2012 | 2 | 2 |
| 2013 | 2 | 2 |
| 2014 | 2 | 0 |
| 2015 | 0 | 0 |
| 2016 | 2 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Device for detection of a clipped ringing signal22 Sep 2026US 12,745,022 B2Nuvoton Technology Corporation
- Rotary phone recording device21 Mar 2023US 11,611,645 B2After the Tone, LLC
- Device for analyzing a disturbance of a facsimile communication device and non-transitory recording medium storing a computer readable program19 Nov 2019US 10,484,553 B2Konica Minolta, Inc.
- Method for implementing user-specific calling preferences3 May 2016US 9,332,121 B2BlackBerry Limited
- System and method for data transfer of object properties23 Feb 2016US 9,270,548 B2Siemens Product Lifecycle Management Software Inc.
- Device for detection of a clipped ringing signal6 Feb 2025US 2025/0048005 A1Nuvoton Technology Corporation
- Nlp-based call monitoring method for preventing voice phishing and apparatus therefor13 Jun 2024US 2024/0195904 A1Solugate Inc.
- Rotary phone recording device8 Dec 2022US 2022/0394121 A1After the Tone, LLC
- Method and apparatus for processing telephone calls in conjunction with call blocking service1 Oct 2020US 2020/0314227 A1Call Silencer LLC
- Communication disturbance analysis device and non-transitory recording medium storing a computer readable program21 Feb 2019US 2019/0058802 A1Konica Minolta, Inc.
Most cited
By later US patents
- Internet answering machine192US 6,052,442 AInternet Magic, Inc. · 2000
- Machine answer detection155US 5,371,787 ADialogic Corporation · 1994
- Communication system for transmitting to a portable receiver data indicative of received image or voice signals154US 5,159,624 ASharp Kabushiki Kaisha · 1992
- Calling number display and recording system138US 5,467,385 A1995
- Method and circuitry for controlling voice mail, call logging and call blocking functions using a modem124US 5,535,265 AAST Research, Inc. · 1996