H04M 1/30
Devices which can set up and transmit only one digit at a
Official title: Devices which can set up and transmit only one digit at a time
H04M1/30 (Devices which can set up and transmit only one digit at a) appears on 228 US grants and 79 published applications in this corpus.
Search patents in H04M- Granted patents
- 228
- Published applications
- 79
- Assignees
- 136
- Inventors
- 366
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 11 | 0 |
| 1978 | 5 | 0 |
| 1979 | 7 | 0 |
| 1980 | 4 | 0 |
| 1981 | 5 | 0 |
| 1982 | 10 | 0 |
| 1983 | 9 | 0 |
| 1984 | 6 | 0 |
| 1985 | 9 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 9 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 8 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 8 | 0 |
| 1999 | 8 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 2 |
| 2002 | 5 | 4 |
| 2003 | 7 | 8 |
| 2004 | 5 | 9 |
| 2005 | 4 | 4 |
| 2006 | 5 | 5 |
| 2007 | 3 | 6 |
| 2008 | 1 | 7 |
| 2009 | 1 | 3 |
| 2010 | 2 | 1 |
| 2011 | 3 | 2 |
| 2012 | 6 | 3 |
| 2013 | 7 | 6 |
| 2014 | 3 | 3 |
| 2015 | 4 | 2 |
| 2016 | 0 | 2 |
| 2017 | 1 | 1 |
| 2018 | 1 | 4 |
| 2019 | 5 | 4 |
| 2020 | 3 | 1 |
| 2021 | 2 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Property modification during communication session27 Jan 2026US 12,537,899 B1Zoom Communications, Inc.
- Systems and methods for content delivery and management21 Sep 2021US 11,126,394 B2Lisnr, Inc.
- Access control and validation using sonic tones27 Jul 2021US 11,074,033 B2Lisnr, Inc.
- Mobile terminal for automatically making a telephone conversation using artificial intelligence11 Aug 2020US 10,742,808 B2LG Electronics Inc.
- Electric circuit arrangement and a method for generating electric current pulses to a load17 Mar 2020US 10,594,318 B2City University of Hong Kong
- Communication Session Modification for External Bypass Integration16 Apr 2026US 2026/0106938 A1Zoom Communications, Inc.
- Telephone signal processing24 Oct 2024US 2024/0357040 A1Sycurio Limited
- Telephone signal processing5 Mar 2020US 2020/0076953 A1Semafone Limited
- Mobile terminal4 Jul 2019US 2019/0208057 A1LG Electronics Inc.
- Physical layer circuitry for multi-wire interface30 May 2019US 2019/0165925 A1M31 Technology Corporation
Most cited
By later US patents
- Method and apparatus for telephonically accessing and navigating the internet268US 5,953,392 ANetphonic Communications, Inc. · 1999
- Information storage device for storing personal identification information232US 5,825,871 ASmart Tone Authentication, Inc. · 1998
- Personal digital assistant module adapted for initiating telephone communications through DTMF dialing231US 5,522,089 ACordata, Inc. · 1996
- System and method using personal identification numbers and associated prompts for controlling unauthorized use of a security device and unauthorized access to a resource230US 5,745,555 ASmart Tone Authentication, Inc. · 1998
- Method and apparatus for the secure communication of data178US 5,583,933 A1996