H04M 1/53
Generation of additional signals
Official title: Generation of additional signals, e.g. additional pulses
H04M1/53 (Generation of additional signals) appears on 28 US grants and 4 published applications in this corpus.
Search patents in H04M- Granted patents
- 28
- Published applications
- 4
- Assignees
- 22
- Inventors
- 53
- Latest grant
- 26 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 4 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 2 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Call flow modification based on un-anchored agent input26 Aug 2025US 12,401,748 B1Zoom Communications, Inc.
- Intelligent and automatic calling process25 Jun 2013US 8,472,613 B1Sprint Communications Co.L.P.
- Premised based 3-way call detection device21 Sep 2004US 6,795,540 B1
- Method of transmitting telephone number in wireless local loop system17 Jun 2003US 6,580,922 B1Hyundai Electronics Ind. Co., Ltd.
- Tone burst generator and its application to telephony11 Feb 2003US 6,519,338 B2Advanced Fibre Communications, Inc.
- Method and apparatus for call protection over a telephone system16 Oct 2008US 2008/0254762 A1General Instrument Corporation
- Origin device based caller identification6 Jan 2005US 2005/0002497 A1
- Origin device based caller identification12 Jun 2003US 2003/0108163 A1International Business Machines Corporation
- Tone burst generator and its application to telephony10 Jan 2002US 2002/0003872 A1Advanced Fibre Communications, Inc.
Most cited
By later US patents
- Method and apparatus for detecting and responding to hook flash events occurring on a remote telephone188US 5,319,702 ATele-Matic Corporation · 1994
- Method and apparatus for detecting an attempted three-way conference call on a remote telephone179US 5,539,812 A1996
- Telephone dialing system126US 4,817,136 A1989
- Electronic headset telephone36US 4,975,949 APlantronics, Inc. · 1990
- Premised based 3-way call detection device35US 6,795,540 B12004