H04Q 1/46
Comprising means for distinguishing between a signalling current of predetermined frequency and
Official title: comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
H04Q1/46 (Comprising means for distinguishing between a signalling current of predetermined frequency and) appears on 116 US grants and 41 published applications in this corpus.
Search patents in H04Q- Granted patents
- 116
- Published applications
- 41
- Assignees
- 85
- Inventors
- 187
- Latest grant
- 3 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 10 | 0 |
| 1995 | 7 | 0 |
| 1996 | 5 | 0 |
| 1997 | 7 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 2 |
| 2002 | 2 | 7 |
| 2003 | 3 | 6 |
| 2004 | 6 | 2 |
| 2005 | 2 | 3 |
| 2006 | 8 | 2 |
| 2007 | 1 | 3 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 2 | 1 |
| 2011 | 1 | 2 |
| 2012 | 2 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 3 | 3 |
| 2016 | 2 | 1 |
| 2017 | 0 | 1 |
| 2018 | 4 | 1 |
| 2019 | 1 | 1 |
| 2020 | 1 | 1 |
| 2021 | 2 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and apparatus for transmitting PLCP frame in wireless local area network system3 Jun 2025US 12,323,283 B2Telefonaktiebolaget LM Ericsson (publ)
- Method and apparatus for transmitting PLCP frame in wireless local area network system13 Feb 2024US 11,902,068 B2Telefonaktiebolaget LM Ericsson (publ)
- Method and apparatus for transmitting PLCP frame in wireless local area network system7 Dec 2021US 11,196,600 B2Wi-Fi One, LLC
- Wireless transmitter/receiver architecture for low-power wide area networks7 Sep 2021US 11,115,731 B1Amazon Technologies, Inc.
- Method and apparatus for transmitting PLCP frame in wireless local area network system7 Apr 2020US 10,616,021 B2Wi-Fi One, LLC
- Method and Apparatus for Transmitting PLCP Frame in Wireless Local Area Network System11 Jul 2024US 2024/0235909 A9Telefonaktiebolaget LM Ericsson (publ)
- Method and Apparatus for Transmitting PLCP Frame in Wireless Local Area Network System25 Apr 2024US 2024/0137255 A1Telefonaktiebolaget LM Ericsson (publ)
- Method and apparatus for transmitting plcp frame in wireless local area network system27 Oct 2022US 2022/0345341 A1Wi-Fi One, LLC
- Method and apparatus for transmitting plcp frame in wireless local area network system25 Jun 2020US 2020/0204413 A1Wi-Fi One, LLC
- Method and apparatus for transmitting plcp frame in wireless local area network system14 Feb 2019US 2019/0052496 A1Wi-Fi One, LLC
Most cited
By later US patents
- Transparent inband signaling150US 5,267,305 AAmbassador College · 1993
- Voice activity detector88US 6,061,647 ABritish Telecommunications Public Ltd.Co. · 2000
- Voice activity detector60US 5,749,067 ABritish Telecommunications Public Ltd.Co. · 1998
- Method and apparatus for identifying speech in telephone signals49US 4,979,214 ADialogic Corporation · 1990
- Classification of audio signals on a telephone line48US 5,007,000 AInternational Telesystems Corporation · 1991