H04R 1/347
For obtaining a phase-shift between the front and back acoustic wave
Official title: {for obtaining a phase-shift between the front and back acoustic wave}
H04R1/347 (For obtaining a phase-shift between the front and back acoustic wave) appears on 193 US grants and 264 published applications in this corpus.
Search patents in H04R- Granted patents
- 193
- Published applications
- 264
- Assignees
- 59
- Inventors
- 257
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 3 |
| 2009 | 1 | 2 |
| 2010 | 0 | 2 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 2 | 6 |
| 2014 | 3 | 1 |
| 2015 | 3 | 3 |
| 2016 | 4 | 1 |
| 2017 | 3 | 4 |
| 2018 | 1 | 3 |
| 2019 | 5 | 6 |
| 2020 | 9 | 9 |
| 2021 | 17 | 51 |
| 2022 | 23 | 25 |
| 2023 | 37 | 32 |
| 2024 | 37 | 56 |
| 2025 | 21 | 25 |
| 2026 | 17 | 33 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Acoustic output device and components thereof4 Aug 2026US 12,701,349 B2Shenzhen Shokz Co., Ltd.
- Acoustic output apparatus and method thereof23 Jun 2026US 12,666,188 B2Shenzhen Shokz Co., Ltd.
- Acoustic output devices with reduced sound leakage16 Jun 2026US 12,659,650 B2Shenzhen Shokz Co., Ltd.
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- Sound signal output system and sound signal output method20 Aug 2026US 2026/0247069 A1NTT, Inc.
- Earphone30 Jul 2026US 2026/0222726 A1Shenzhen Shokz Co., Ltd.
- Speaker device30 Jul 2026US 2026/0222734 A1Panasonic Intellectual Property Management Co., Ltd.
- Sound signal output apparatus16 Jul 2026US 2026/0205733 A1NTT, Inc.
- Sound signal output apparatus16 Jul 2026US 2026/0205734 A1NTT, Inc.
Most cited
By later US patents
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- Apparatus and method for audio delivery with different sound conduction transducers32US 9,020,168 B2Nokia Corporation · 2015
- Loudspeaker structure31US 5,297,214 A1994