H04Q 1/30
Signalling arrangements
Official title: Signalling arrangements; Manipulation of signalling currents (multiplex systems providing for calling or supervisory signals H04J1/14, H04J3/12)
H04Q1/30 (Signalling arrangements) appears on 785 US grants and 228 published applications in this corpus.
Search patents in H04Q- Granted patents
- 785
- Published applications
- 228
- Assignees
- 362
- Inventors
- 1,250
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 39 | 0 |
| 1977 | 32 | 0 |
| 1978 | 27 | 0 |
| 1979 | 12 | 0 |
| 1980 | 27 | 0 |
| 1981 | 12 | 0 |
| 1982 | 18 | 0 |
| 1983 | 18 | 0 |
| 1984 | 14 | 0 |
| 1985 | 20 | 0 |
| 1986 | 21 | 0 |
| 1987 | 20 | 0 |
| 1988 | 12 | 0 |
| 1989 | 22 | 0 |
| 1990 | 18 | 0 |
| 1991 | 10 | 0 |
| 1992 | 17 | 0 |
| 1993 | 18 | 0 |
| 1994 | 24 | 0 |
| 1995 | 28 | 0 |
| 1996 | 18 | 0 |
| 1997 | 18 | 0 |
| 1998 | 24 | 0 |
| 1999 | 23 | 0 |
| 2000 | 20 | 0 |
| 2001 | 17 | 7 |
| 2002 | 22 | 31 |
| 2003 | 18 | 27 |
| 2004 | 24 | 26 |
| 2005 | 18 | 15 |
| 2006 | 25 | 8 |
| 2007 | 17 | 19 |
| 2008 | 5 | 6 |
| 2009 | 10 | 7 |
| 2010 | 12 | 8 |
| 2011 | 11 | 13 |
| 2012 | 10 | 3 |
| 2013 | 15 | 5 |
| 2014 | 11 | 7 |
| 2015 | 13 | 5 |
| 2016 | 6 | 4 |
| 2017 | 4 | 5 |
| 2018 | 6 | 8 |
| 2019 | 9 | 7 |
| 2020 | 7 | 4 |
| 2021 | 4 | 1 |
| 2022 | 1 | 3 |
| 2023 | 0 | 1 |
| 2024 | 2 | 5 |
| 2025 | 2 | 1 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H04Q 1/44Using alternate current659
- H04Q 1/32Using trains of dc pulses44
- H04Q 1/50Conversion between different kinds of signals32
- H04Q 1/38Using combinations of direct currents of different amplitudes or polarities over line29
- H04Q 1/39Using coded pulse groups16
- H04Q 1/48Induced-current signalling arrangements3
- H04Q 1/40Whereby duration of pulse or interval between two pulses is variable1
Recent patents
- Device for detection of a clipped ringing signal22 Sep 2026US 12,745,022 B2Nuvoton Technology Corporation
- System, method, and apparatus for detecting call interception11 Aug 2026US 12,707,265 B2University of Florida Research Foundation, Inc.
- Call classification through analysis of DTMF events5 May 2026US 12,621,382 B2Pindrop Security, Inc.
- Remote control device, electronic device and control methods thereof6 Jan 2026US 12,520,000 B2Samsung Electronics Co., Ltd.
- Method and apparatus for transmitting PLCP frame in wireless local area network system3 Jun 2025US 12,323,283 B2Telefonaktiebolaget LM Ericsson (publ)
- Call classification through analysis of dtmf events17 Sep 2026US 2026/0281227 A1Pindrop Security, Inc.
- Remote control device, electronic device and control methods thereof2 Apr 2026US 2026/0095613 A1Samsung Electronics Co., Ltd.
- Device for detection of a clipped ringing signal6 Feb 2025US 2025/0048005 A1Nuvoton Technology Corporation
- System, method, and apparatus for detecting call interception19 Dec 2024US 2024/0422545 A1University of Florida Research Foundation, Inc.
- Call classification through analysis of dtmf events26 Sep 2024US 2024/0323270 A1Pindrop Security, Inc.
Most cited
By later US patents
- Telephone system for connecting a customer to a supplier of goods744US 4,757,267 AApplied Telematics, Inc. · 1988
- Call routing based on the caller's mood398US 6,411,687 B1Mitel Knowledge Corporation · 2002
- Method and apparatus for telephonically accessing and navigating the internet268US 5,953,392 ANetphonic Communications, Inc. · 1999
- Speech encoding in a client server system250US 6,594,347 B1International Business Machines Corporation · 2003
- Information storage device for storing personal identification information232US 5,825,871 ASmart Tone Authentication, Inc. · 1998