H04Q 1/32
Using trains of dc pulses
Official title: using trains of DC pulses (H04Q1/39 takes precedence)
H04Q1/32 (Using trains of dc pulses) appears on 44 US grants and 2 published applications in this corpus.
Search patents in H04Q- Granted patents
- 44
- Published applications
- 2
- Assignees
- 34
- Inventors
- 66
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 6 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Device for detection of a clipped ringing signal22 Sep 2026US 12,745,022 B2Nuvoton Technology Corporation
- Motor vehicle having a plurality of antennas and at least one communication device22 Jan 2019US 10,187,103 B2Audi AG
- Telephone line monitoring apparatus and method3 Sep 1996US 5,553,116 ATeletron Ltd.
- Telephone line monitoring apparatus and method13 Sep 1994US 5,347,572 ATeletron Ltd.
- Device for connecting a subscriber line to a selected internal line1 Sep 1992US 5,144,652 A
Most cited
By later US patents
- Dial pulse selection43US 4,924,501 ABritish Telecommunications plc · 1990
- Pulse detector for counting dial generated pulses27US 4,868,873 AAerotel Israel · 1989
- Dial pulse restorer20US 4,319,091 ADictaphone Corporation · 1982
- Rotary dial pulse receiver20US 4,944,001 AComcheq Services Limited · 1990
- Circuit for detecting dial pulses19US 4,055,730 AComex Systems, Inc. · 1977