H04M 9/003
Transmission of control signals from or to the key telephone set
Official title: {Transmission of control signals from or to the key telephone set; signalling equipment at key telephone set, e.g. keyboard or display equipment (keyboard equipment in semi-automatic systems H04M3/62)}
H04M9/003 (Transmission of control signals from or to the key telephone set) appears on 92 US grants and 18 published applications in this corpus.
Search patents in H04M- Granted patents
- 92
- Published applications
- 18
- Assignees
- 53
- Inventors
- 174
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 14 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 7 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 0 |
| 2016 | 1 | 3 |
| 2017 | 0 | 0 |
| 2018 | 2 | 4 |
| 2019 | 4 | 3 |
| 2020 | 1 | 0 |
| 2021 | 2 | 2 |
| 2022 | 1 | 0 |
| 2023 | 2 | 1 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Computer-programmed telephone-enabled devices for processing and managing numerous simultaneous voice conversations conducted by an individual over a computer network and computer methods of implementing thereof24 Feb 2026US 12,563,109 B2Voxsmart Limited
- Computer-programmed telephone-enabled devices for processing and managing numerous simultaneous voice conversations conducted by an individual over a computer network and computer methods of implementing thereof7 Nov 2023US 11,811,973 B2Green Key Technologies, Inc.
- Computer-programmed telephone-enabled devices for processing and managing numerous simultaneous voice conversations conducted by an individual over a computer network and computer methods of implementing thereof3 Jan 2023US 11,546,474 B2Green Key Technologies, Inc.
- Systems, methods and computer program products for controlling the audio levels of multiple simultaneous communication channels1 Nov 2022US 11,487,499 B2Ipc Systems, Inc.
- Systems, methods and computer program products for controlling the audio levels of multiple simultaneous communication channels4 May 2021US 10,996,918 B2Ipc Systems, Inc.
- Computer-programmed telephone-enabled devices for processing and managing numerous simultaneous voice conversations conducted by an individual over a computer network and computer methods of implementing thereof18 Jun 2026US 2026/0172457 A1Voxsmart Limited
- Computer-programmed telephone-enabled devices for processing and managing numerous simultaneous voice conversations conducted by an individual over a computer network and computer methods of implementing thereof25 Jan 2024US 2024/0031490 A1Green Key Technologies, Inc.
- Computer-programmed telephone-enabled devices for processing and managing numerous simultaneous voice conversations conducted by an individual over a computer network and computer methods of implementing thereof6 Apr 2023US 2023/0109198 A1Green Key Technologies, Inc.
- Systems, methods and computer program products for controlling the audio levels of multiple simultaneous communication channels1 Jul 2021US 2021/0200508 A1Ipc Systems, Inc.
- Computer-programmed telephone-enabled devices for processing and managing numerous simultaneous voice conversations conducted by an individual over a computer network and computer methods of implementing thereof18 Mar 2021US 2021/0084171 A1Green Key Technologies, Inc.
Most cited
By later US patents
- Emulation of phone extensions in a packet telephony distribution system114US 6,697,358 B22Wire, Inc. · 2004
- Home and small business phone system for operation on a single internal twisted pair line and methodology for operating the same85US 5,548,592 ACreative Integrated Systems, Inc. · 1996
- Telephone system with monitor on hold feature75US 5,195,087 AAT&T Bell Laboratories · 1993
- Communication circuit with combined power feed and data transmission over a phantom channel71US 4,173,714 ATIE/Communications, Inc. · 1979
- Program controlled communication system having individually rearrangeable line selection60US 4,196,316 ABell Telephone Laboratories, Incorporated · 1980