H04H 20/48
For fm stereophonic broadcast systems
Official title: for FM stereophonic broadcast systems
H04H20/48 (For fm stereophonic broadcast systems) appears on 121 US grants and 75 published applications in this corpus.
Search patents in H04H- Granted patents
- 121
- Published applications
- 75
- Assignees
- 59
- Inventors
- 154
- Latest grant
- 17 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 8 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 2 |
| 2002 | 2 | 1 |
| 2003 | 2 | 13 |
| 2004 | 2 | 0 |
| 2005 | 2 | 3 |
| 2006 | 3 | 7 |
| 2007 | 4 | 26 |
| 2008 | 2 | 6 |
| 2009 | 3 | 3 |
| 2010 | 15 | 3 |
| 2011 | 13 | 3 |
| 2012 | 5 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 2 | 1 |
| 2019 | 1 | 3 |
| 2020 | 1 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for providing broadcast signal frequency and system for providing the same17 Jun 2025US 12,335,027 B2Hyundai Motor Company
- FM system modes for HD radio15 Jun 2021US 11,038,622 B2iBiquity Digital Corporation
- Audio processor apparatus, methods and computer program products using integrated diversity delay error compensation25 Feb 2020US 10,574,371 B2Wheatstone Corporation
- Analog and digital audio alignment in the HD radio exciter engine (exgine)19 Nov 2019US 10,484,115 B2iBiquity Digital Corporation
- Stereo-phonic frequency modulation receiver and method for separating dual sound channels17 Jul 2018US 10,026,409 B2MStar Semiconductor, Inc.
- Method for providing broadcast signal frequency and system for providing the same29 Dec 2022US 2022/0416923 A1Hyundai Motor Company
- Fm system modes for hd radio22 Aug 2019US 2019/0260505 A1iBiquity Digital Corporation
- Analog and digital audio alignment in the hd radio exciter engine (exgine)15 Aug 2019US 2019/0253163 A1iBiquity Digital Corporation
- Audio Processor Apparatus, Methods and Computer Program Products Using Integrated Diversity Delay Error Compensation25 Apr 2019US 2019/0123841 A1Wheatstone Corporation
- Stereo-phonic frequency modulation receiver and method for separating dual sound channels18 Jan 2018US 2018/0018976 A1MStar Semiconductor, Inc.
Most cited
By later US patents
- Inductively coupled wireless system and method395US 6,424,820 B1Interval Research Corporation · 2002
- Apparatus and methods for identifying broadcast audio program selections in an FM stereo broadcast system339US 5,134,719 A1992
- System for short range transmission of a plurality of signals simultaneously over the air using high frequency carriers323US 5,491,839 AL. S. Research, Inc. · 1996
- Apparatus and methods for music and lyrics broadcasting149US 5,408,686 A1995
- Receiver apparatus and methods for identifying broadcast audio program selections in a radio broadcast system119US 5,119,507 A1992