H04M 3/14
Signalling existence of persistent "off-hook" condition
H04M3/14 (Signalling existence of persistent "off-hook" condition) appears on 37 US grants and 21 published applications in this corpus.
Search patents in H04M- Granted patents
- 37
- Published applications
- 21
- Assignees
- 27
- Inventors
- 68
- Latest grant
- 3 Jan 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 2 | 2 |
| 2006 | 2 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 1 |
| 2013 | 2 | 1 |
| 2014 | 2 | 1 |
| 2015 | 1 | 1 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 2 |
| 2019 | 1 | 3 |
| 2020 | 0 | 2 |
| 2021 | 3 | 0 |
| 2022 | 1 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Bandwidth control method and apparatus, and device3 Jan 2023US 11,546,644 B2Huawei Technolgoies Co., Ltd.
- Gateway and method for managing VoIP telephone service14 Jun 2022US 11,363,134 B2Orange
- Method for using automatic communication management, method and device for automatic communication management, and terminal using same31 Aug 2021US 11,108,904 B2Orange
- Voice over internet protocol processing method and related network device20 Jul 2021US 11,070,665 B2Huawei Technologies Co., Ltd.
- Method and system for providing backup push-to-talk function in stuck microphone condition5 Jan 2021US 10,887,451 B2Honeywell International Inc.
- Test of a Communication Interface Connected to an Analog Telephone Line29 May 2025US 2025/0175553 A1Sagemcom Broadband SAS
- Method and system for providing backup push-to-talk function in stuck microphone condition30 Apr 2020US 2020/0137218 A1Honeywell International Inc.
- Bandwidth Control Method and Apparatus, and Device23 Jan 2020US 2020/0029110 A1Huawei Technologies Co., Ltd.
- Gateway and method for managing voip telephone service26 Dec 2019US 2019/0394327 A1Orange
- Voice over internet protocol processing method and related network device12 Dec 2019US 2019/0379785 A1Huawei Technologies Co., Ltd.
Most cited
By later US patents
- Telephone inadvertent off-hook condition detector92US 5,592,529 AInternational Business Machines Corporation · 1997
- Automatic hangup apparatus for restoring service to off-hook telephones65US 4,922,529 A1990
- Receiver device for receiving ringing signals in an off-hook line condition53US 5,390,249 A1995
- Off-hook disconnect and reconnect ringer device50US 5,612,997 A1997
- Off-hook telephone clearing system41US 5,764,752 ASouth Tech Instruments, Inc. · 1998