H04R 27/04
Electric megaphones
H04R27/04 (Electric megaphones) appears on 50 US grants and 33 published applications in this corpus.
Search patents in H04R- Granted patents
- 50
- Published applications
- 33
- Assignees
- 30
- Inventors
- 72
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 1 |
| 2006 | 1 | 2 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 2 |
| 2012 | 2 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 3 |
| 2015 | 1 | 0 |
| 2016 | 1 | 1 |
| 2017 | 1 | 2 |
| 2018 | 0 | 0 |
| 2019 | 2 | 3 |
| 2020 | 5 | 3 |
| 2021 | 4 | 1 |
| 2022 | 3 | 5 |
| 2023 | 3 | 2 |
| 2024 | 2 | 1 |
| 2025 | 1 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Network capable parametric speaker array with interferometer and distributed coherence system16 Jun 2026US 12,659,662 B2The United States of America as represented by the Secretary of the Navy
- Transmitting messages to a display device based on detected audio output21 Jan 2025US 12,204,818 B2Roku, Inc.
- Drone-based, attacker neutralization24 Sep 2024US 12,099,374 B2
- Transmitting messages to a display device based on detected audio output9 Apr 2024US 11,954,400 B2Roku, Inc.
- Smart mask and smart mask system19 Dec 2023US 11,848,024 B2Robert Bosch GmbH
- Transmitting messages to a display device based on detected audio output27 Mar 2025US 2025/0103277 A1Roku, Inc.
- Speaker megaphone23 Jan 2025US 2025/0030997 A1
- Transmitting messages to a display device based on detected audio output4 Jul 2024US 2024/0220192 A1Roku, Inc.
- Network capable parametric speaker array with interferometer and distributed coherence system30 Nov 2023US 2023/0388707 A1The United States of America as represented by the Secretary of the Navy
- Voice isolation device12 Jan 2023US 2023/0010149 A1Private MONK Inc.
Most cited
By later US patents
- Portable audio apparatus48US 5,349,480 ASeiko Epson Corporation · 1994
- Simulated space helmet41US 4,400,591 A1983
- Public alarm for cochlear implant34US 5,941,905 ACochlear Limited · 1999
- Portable information reproducing and voice amplifying apparatus31US 5,303,109 ASeiko Epson Corporation · 1994
- Communication apparatus for hostile environments30US 4,491,699 ANL Industries, Inc. · 1985