H04H 20/30
By a single channel
Official title: by a single channel
H04H20/30 (By a single channel) appears on 873 US grants and 726 published applications in this corpus.
Search patents in H04H- Granted patents
- 873
- Published applications
- 726
- Assignees
- 271
- Inventors
- 1,160
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 11 | 0 |
| 1995 | 9 | 0 |
| 1996 | 14 | 0 |
| 1997 | 7 | 0 |
| 1998 | 28 | 0 |
| 1999 | 26 | 0 |
| 2000 | 11 | 0 |
| 2001 | 17 | 13 |
| 2002 | 21 | 33 |
| 2003 | 24 | 47 |
| 2004 | 18 | 47 |
| 2005 | 30 | 35 |
| 2006 | 20 | 37 |
| 2007 | 27 | 43 |
| 2008 | 30 | 34 |
| 2009 | 35 | 71 |
| 2010 | 51 | 66 |
| 2011 | 70 | 51 |
| 2012 | 65 | 39 |
| 2013 | 54 | 24 |
| 2014 | 63 | 25 |
| 2015 | 39 | 34 |
| 2016 | 31 | 22 |
| 2017 | 28 | 17 |
| 2018 | 22 | 21 |
| 2019 | 25 | 19 |
| 2020 | 23 | 15 |
| 2021 | 16 | 7 |
| 2022 | 12 | 8 |
| 2023 | 9 | 6 |
| 2024 | 4 | 5 |
| 2025 | 8 | 6 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Receiver and transceiver30 Jun 2026US 12,671,509 B2Uniden Holdings Corporation
- Broadcasting contextual information through modification of audio and video interfaces9 Dec 2025US 12,494,857 B2JVCKENWOOD Corporation
- Apparatus and methods to associate different watermarks detected in media4 Nov 2025US 12,464,200 B2The Nielsen Company (US), LLC
- Methods and apparatus to perform audio watermarking and watermark detection and extraction7 Oct 2025US 12,437,769 B2The Nielsen Company (US), LLC
- Systems and method for consistent FM/HD1 diversity delay23 Sep 2025US 12,425,116 B2Nautel Limited
- Inaudible orthogonal signal communication2 Apr 2026US 2026/0095258 A1Amazon Technologies, Inc.
- Broadcast receiving apparatus and method of processing transmission waves2 Oct 2025US 2025/0310017 A1Maxell, Ltd.
- Methods and apparatus to perform audio watermarking and watermark detection and extraction21 Aug 2025US 2025/0265293 A1The Nielsen Company (US), LLC
- Variable Modulation Intensity For Layered FM HD Radio Service Modes17 Jul 2025US 2025/0233789 A1iBiquity Digital Corporation
- Method And System For Synchronizing Audio Transmission In A Single Frequency Network22 May 2025US 2025/0167906 A1iBiquity Digital Corporation
Most cited
By later US patents
- Audience measurement system utilizing ancillary codes and passive signatures1,063US 5,481,294 AA. C. Nielsen Company · 1996
- Watermark embedder and reader942US 6,614,914 B1Digimarc Corporation · 2003
- Connected audio and other media objects859US 6,505,160 B1Digimarc Corporation · 2003
- System and method for playing games and rewarding successful players816US 5,697,844 AResponse Reward Systems L.C. · 1997
- Signal processing appparatus and methods797US 5,335,277 AThe Personalized Mass Media Corporation · 1994