H04R 2201/34
Directing or guiding sound by means of a phase plug
H04R2201/34 (Directing or guiding sound by means of a phase plug) appears on 184 US grants and 214 published applications in this corpus.
Search patents in H04R- Granted patents
- 184
- Published applications
- 214
- Assignees
- 101
- Inventors
- 282
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 3 |
| 2003 | 1 | 4 |
| 2004 | 0 | 13 |
| 2005 | 4 | 13 |
| 2006 | 6 | 11 |
| 2007 | 10 | 6 |
| 2008 | 5 | 4 |
| 2009 | 2 | 4 |
| 2010 | 2 | 5 |
| 2011 | 2 | 4 |
| 2012 | 4 | 3 |
| 2013 | 3 | 4 |
| 2014 | 9 | 6 |
| 2015 | 10 | 15 |
| 2016 | 7 | 6 |
| 2017 | 12 | 9 |
| 2018 | 10 | 23 |
| 2019 | 16 | 10 |
| 2020 | 16 | 7 |
| 2021 | 6 | 5 |
| 2022 | 9 | 12 |
| 2023 | 10 | 12 |
| 2024 | 17 | 13 |
| 2025 | 10 | 7 |
| 2026 | 6 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Omni directional unified communications system tabletop audio device using two or more loudspeakers25 Aug 2026US 12,720,255 B2Crestron Electronics, Inc.
- Acoustic signal output device18 Aug 2026US 12,713,168 B2NTT, Inc.
- Audio transducer with high aspect ratio actuator4 Aug 2026US 12,701,365 B1Amazon Technologies, Inc.
- Dual compression driver with single magnet16 Jun 2026US 12,659,667 B2Harman Professional, Inc.
- Dual compression driver with internal magnets and annular exit26 May 2026US 12,641,364 B2Harman Professional, Inc.
- Loudspeaker with phase plug8 Oct 2026US 2026/0313292 A1Ask Industries Societa' Per Azioni
- Phase plug for compression drivers6 Aug 2026US 2026/0230747 A1B&C Speakers S.P.A.
- Audio speaker system30 Jul 2026US 2026/0222718 A1Merry Electronics North America Inc., Doing Business AS Sonavox Mena
- Speaker device30 Jul 2026US 2026/0222734 A1Panasonic Intellectual Property Management Co., Ltd.
- Dual compression driver with inboard annular exit2 Jul 2026US 2026/0189852 A1Harman Professional, Inc.
Most cited
By later US patents
- Acoustic optimization170US 8,965,033 B2Sonos, Inc. · 2015
- Audio driver and power supply unit architecture52US 9,930,444 B1Apple Inc. · 2018
- High performance loudspeaker system43US 5,872,339 A1999
- Speaker with a molded plastic frame including a positioning projection, and a method for manufacturing the same26US 5,583,945 AMinebea Co., Ltd. · 1996
- High frequency compression drivers25US 6,320,970 B12001