H04R 2209/022
Aspects regarding the stray flux internal or external to the magnetic circuit
Official title: Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
H04R2209/022 (Aspects regarding the stray flux internal or external to the magnetic circuit) appears on 217 US grants and 258 published applications in this corpus.
Search patents in H04R- Granted patents
- 217
- Published applications
- 258
- Assignees
- 135
- Inventors
- 500
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 8 |
| 2005 | 3 | 7 |
| 2006 | 6 | 8 |
| 2007 | 0 | 4 |
| 2008 | 2 | 4 |
| 2009 | 4 | 7 |
| 2010 | 0 | 4 |
| 2011 | 4 | 9 |
| 2012 | 7 | 5 |
| 2013 | 6 | 10 |
| 2014 | 9 | 18 |
| 2015 | 11 | 14 |
| 2016 | 17 | 20 |
| 2017 | 16 | 12 |
| 2018 | 9 | 9 |
| 2019 | 11 | 14 |
| 2020 | 11 | 15 |
| 2021 | 14 | 11 |
| 2022 | 10 | 8 |
| 2023 | 8 | 12 |
| 2024 | 10 | 13 |
| 2025 | 12 | 33 |
| 2026 | 3 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hybrid sound radiation device for vibrating a heavy-weight rigid plate at audio frequencies30 Jun 2026US 12,671,947 B2Sensonic Design Ireland Limited
- Loudspeaker performance utilizing coupled loudspeaker motors9 Jun 2026US 12,652,498 B1Amazon Technologies, Inc.
- Control apparatus21 Apr 2026US 12,606,101 B2Hosiden Corporation
- Magnetic field cancelling audio devices4 Nov 2025US 12,464,292 B1Seescan, Inc.
- Double-sided sounding device21 Oct 2025US 12,452,603 B2AAC Microtech (Changzhou) Co., Ltd.
- Acoustic electrodynamic actuator with structured end face of outer magnetic circuit part and output device thereto4 Jun 2026US 2026/0156417 A1Sound Solutions International (Zhenjiang) Co., Ltd.
- Loudspeaker4 Jun 2026US 2026/0156418 A1AAC Microtech (Changzhou) Co., Ltd.
- Loudspeakers and electronic devices7 May 2026US 2026/0129324 A1King Tone Innovation (Beijing) Technology Co. Ltd.
- Diaphragms, air conduction speakers, and wearable electronic devices7 May 2026US 2026/0129367 A1Shenzhen Shokz Co., Ltd.
- Diaphragms, air conduction speakers, and wearable electronic devices7 May 2026US 2026/0129368 A1Shenzhen Shokz Co., Ltd.
Most cited
By later US patents
- Radio frequency shielding for receivers within hearing aids and listening devices95US 7,460,681 B2Sonion Nederland B. V. · 2008
- Portable computer having a case which contains a speaker in a front wall and a keyboard in an upper wall74US 5,646,820 AKabushiki Kaisha Toshiba · 1997
- Speaker unit having two voice coils wound around a common coil bobbin60US 4,783,824 ATrio Kabushiki Kaisha · 1988
- Speaker having magnetic circuit38US 5,715,324 AAlpine Electronics, Inc. · 1998
- Light-weight speaker system36US 5,390,257 A1995