H04R 1/2861
Using a back-loaded horn
Official title: {using a back-loaded horn}
H04R1/2861 (Using a back-loaded horn) appears on 111 US grants and 95 published applications in this corpus.
Search patents in H04R- Granted patents
- 111
- Published applications
- 95
- Assignees
- 57
- Inventors
- 228
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 3 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 3 |
| 2009 | 3 | 5 |
| 2010 | 1 | 0 |
| 2011 | 3 | 5 |
| 2012 | 7 | 9 |
| 2013 | 8 | 3 |
| 2014 | 2 | 7 |
| 2015 | 4 | 4 |
| 2016 | 6 | 2 |
| 2017 | 5 | 7 |
| 2018 | 6 | 11 |
| 2019 | 10 | 5 |
| 2020 | 4 | 6 |
| 2021 | 5 | 7 |
| 2022 | 6 | 1 |
| 2023 | 4 | 9 |
| 2024 | 6 | 2 |
| 2025 | 4 | 1 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Coaxial loudspeaker with horn and shape optimization method therefor17 Mar 2026US 12,581,231 B2Suzhou Sonavox Electronics Co., Ltd.
- Sound amplification structure and building foundation structure14 Oct 2025US 12,442,152 B2Shimex Ltd.
- Electroacoustic transducer and electroacoustic transducer unit29 Jul 2025US 12,375,848 B2Foster Electric Company, Limited
- Sleep apnea treatment apparatus and method22 Apr 2025US 12,280,220 B2MaRI Co., Ltd.
- Speaker22 Apr 2025US 12,284,504 B2LG Electronics Inc.
- Audio speaker system30 Jul 2026US 2026/0222718 A1Merry Electronics North America Inc., Doing Business AS Sonavox Mena
- Acoustic signal output device25 Jun 2026US 2026/0181315 A1NTT, Inc.
- Use of corrugated and perforated tubes in a nested configuration within a rear loaded horn speaker enclosure to improve the acoustic performance and bass response4 Jun 2026US 2026/0156404 A1
- Electronic stethoscope2 Oct 2025US 2025/0302425 A1Murata Manufacturing Co., Ltd.
- Electroacoustic transducer and electroacoustic transducer unit7 Nov 2024US 2024/0373160 A1Foster Electric Company, Limited
Most cited
By later US patents
- High frequency horn having a tuned resonant cavity81US 8,607,922 B1Harman International Industries, Incorporated · 2013
- Ceiling speaker assembly76US 8,479,871 B2RGB Systems, Inc. · 2013
- Ceiling speaker assembly75US 8,297,402 B2RGB Systems, Inc. · 2012
- High output loudspeaker for low frequency reproduction54US 4,733,749 AElectro-Voice, Incorporated · 1988
- Sound enhancing speaking cabinet for a removable speaker assembly47US 6,349,792 B12002