H04R 1/38
In which sound waves act upon both sides of a diaphragm and
Official title: in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
H04R1/38 (In which sound waves act upon both sides of a diaphragm and) appears on 239 US grants and 238 published applications in this corpus.
Search patents in H04R- Granted patents
- 239
- Published applications
- 238
- Assignees
- 109
- Inventors
- 329
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 6 |
| 2003 | 3 | 4 |
| 2004 | 4 | 8 |
| 2005 | 2 | 6 |
| 2006 | 8 | 2 |
| 2007 | 4 | 5 |
| 2008 | 3 | 3 |
| 2009 | 1 | 10 |
| 2010 | 3 | 8 |
| 2011 | 2 | 13 |
| 2012 | 8 | 9 |
| 2013 | 16 | 10 |
| 2014 | 11 | 8 |
| 2015 | 5 | 7 |
| 2016 | 6 | 7 |
| 2017 | 5 | 4 |
| 2018 | 11 | 12 |
| 2019 | 8 | 8 |
| 2020 | 8 | 6 |
| 2021 | 9 | 36 |
| 2022 | 18 | 15 |
| 2023 | 24 | 24 |
| 2024 | 16 | 13 |
| 2025 | 9 | 11 |
| 2026 | 5 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- 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.
- Information processing method and information processing apparatus5 May 2026US 12,621,603 B2Yamaha Corporation
- MEMS microphone with multiple sound ports21 Apr 2026US 12,610,180 B2Soundskrit Inc.
- Headphones17 Feb 2026US 12,556,859 B2Shenzhen Shokz Co., Ltd.
- Sound signal output apparatus16 Jul 2026US 2026/0205733 A1NTT, Inc.
- Headphones4 Jun 2026US 2026/0156403 A1Shenzhen Shokz Co., Ltd.
- Directional Microphone Module28 Aug 2025US 2025/0274700 A1Aac Acoustic Technologies (Shenzhen) Co., Ltd.
- Acoustic output apparatus3 Jul 2025US 2025/0220357 A1Shenzhen Shokz Co., Ltd.
- Microphones3 Jul 2025US 2025/0220360 A1Shenzhen Shokz Co., Ltd.
Most cited
By later US patents
- Unidirectional ear microphone and method273US 5,363,444 AJabra Corporation · 1994
- Microphone with improved sound inlet port181US 7,072,482 B2Sonion Nederland B. V. · 2006
- Loudspeaking telephone station including directional microphone162US 5,121,426 AAT&T Bell Laboratories · 1992
- Hearing aid for persons with an impaired hearing faculty114US 5,214,709 AViennatone Gesellschaft m.b.H. · 1993
- Differential microphone99US 6,788,796 B1The Research Foundation of State University of New York · 2004