H04R 2209/043
Short circuited voice coils driven by induction
H04R2209/043 (Short circuited voice coils driven by induction) appears on 15 US grants and 9 published applications in this corpus.
Search patents in H04R- Granted patents
- 15
- Published applications
- 9
- Assignees
- 12
- Inventors
- 34
- Latest grant
- 30 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 2 |
| 2005 | 1 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Dual axial magnetic flux induction speaker30 Dec 2025US 12,513,469 B2
- Loudspeaker magnetic circuit system having U-shaped short-circuit ring31 Dec 2019US 10,524,056 B2Tymphany Acoustic Technology (Huizhou) Co., Ltd.
- Acoustic loudspeaker23 Dec 2014US 8,917,898 B2Focal Jmlab
- Induction motor for loudspeaker30 Aug 2011US 8,009,857 B2Wisdom Audio Corp.
- Speaker apparatus21 Mar 2006US 7,016,515 B2Sony Corporation
- Dual axial magnetic flux induction speaker25 May 2023US 2023/0164492 A1
- New loudspeaker structure30 Jun 2022US 2022/0210575 A1Xiamen Sound's Great Electronics and Technology Co., Ltd.
- Loudspeaker Magnetic Circuit System Having U-Shaped Short-Circuit Ring21 Mar 2019US 2019/0090063 A1Premium Loudspeakers (Hui Zhou) Co., Ltd.
- Electro-magnetic transducer and vibration control system1 Oct 2015US 2015/0280634 A1Ask Industries Societa' Perazioni
- Acoustic loudspeaker13 Jun 2013US 2013/0148841 A1Focal Jmlab
Most cited
By later US patents
- Acoustic transducer56US 6,175,637 B1Sony Corporation · 2001
- Inductive braking in a dual coil speaker driver unit39US 5,828,767 AJBL Incorporated · 1998
- Induction speaker29US 5,062,140 ASony Corporation · 1991
- Speaker apparatus28US 5,909,496 ASony Corporation · 1999
- Electro acoustic transducer and loudspeaker26US 4,965,839 A1990