H04Q 1/4575
Which are transmitted in digital form
Official title: {which are transmitted in digital form}
H04Q1/4575 (Which are transmitted in digital form) appears on 111 US grants and 20 published applications in this corpus.
Search patents in H04Q- Granted patents
- 111
- Published applications
- 20
- Assignees
- 81
- Inventors
- 191
- Latest grant
- 7 Sep 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 7 | 0 |
| 1981 | 2 | 0 |
| 1982 | 6 | 0 |
| 1983 | 8 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 4 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 5 |
| 2003 | 6 | 1 |
| 2004 | 4 | 1 |
| 2005 | 2 | 2 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 1 |
| 2010 | 3 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 2 | 1 |
| 2014 | 1 | 2 |
| 2015 | 3 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 2 | 0 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Wireless transmitter/receiver architecture for low-power wide area networks7 Sep 2021US 11,115,731 B1Amazon Technologies, Inc.
- Computer assisted patient navigation and information systems and methods16 Jul 2019US 10,354,051 B2Forge Laboratories, LLC
- Method and apparatus for intelligent dual-tone multi-frequency (DTMF) decoding and identification16 Apr 2019US 10,264,333 B1
- Method and apparatus for transmitting signaling1 Dec 2015US 9,204,206 B2Huawei Device Co., Ltd.
- Method and apparatus for detecting one or more predetermined tones transmitted over a communication network10 Nov 2015US 9,185,471 B2Freescale Semiconductor, Inc.
- Computer assisted patient navigation and information systems and methods22 Feb 2018US 2018/0052968 A1Grace Clinic Holdings, LLC
- Method and apparatus for detecting one or more predetermined tones transmitted over a communication network20 Nov 2014US 2014/0341214 A1Freescale Semiconductor, Inc.
- Method and apparatus for tranmitting signaling2 Jan 2014US 2014/0004844 A1Huawei Device Co., Ltd.
- Methods and apparatus for efficient tone detection10 Oct 2013US 2013/0268571 A1LSI Corporation
- Method and apparatus for detecting one or more predetermined tones transmitted over a communication network19 May 2011US 2011/0116497 A1Freescale Semiconductor, Inc.
Most cited
By later US patents
- Streamlined digital signal processor96US 4,718,057 AAdvanced Micro Devices, Inc. · 1988
- Multi-frequency signal detector and classifier65US 5,353,346 AMPR Teltech Ltd. · 1994
- Digital DTMF tone detector55US 5,119,322 AMitel Corporation · 1992
- Digital tone decoder and method of decoding tones using linear prediction coding53US 4,689,760 ADigital Sound Corporation · 1987
- Method and apparatus for detecting control signals52US 5,442,696 AAT&T Corp. · 1995