H04R 9/025
Magnetic circuit
Official title: {Magnetic circuit}
H04R9/025 (Magnetic circuit) appears on 2,223 US grants and 2,641 published applications in this corpus.
Search patents in H04R- Granted patents
- 2,223
- Published applications
- 2,641
- Assignees
- 576
- Inventors
- 2,808
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 5 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 7 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 8 | 0 |
| 1994 | 7 | 0 |
| 1995 | 8 | 0 |
| 1996 | 8 | 0 |
| 1997 | 9 | 0 |
| 1998 | 16 | 0 |
| 1999 | 9 | 0 |
| 2000 | 3 | 0 |
| 2001 | 25 | 5 |
| 2002 | 9 | 26 |
| 2003 | 16 | 17 |
| 2004 | 25 | 51 |
| 2005 | 16 | 35 |
| 2006 | 28 | 41 |
| 2007 | 19 | 33 |
| 2008 | 19 | 28 |
| 2009 | 17 | 24 |
| 2010 | 11 | 29 |
| 2011 | 21 | 33 |
| 2012 | 32 | 50 |
| 2013 | 27 | 39 |
| 2014 | 38 | 59 |
| 2015 | 55 | 70 |
| 2016 | 77 | 102 |
| 2017 | 90 | 135 |
| 2018 | 126 | 165 |
| 2019 | 154 | 161 |
| 2020 | 194 | 258 |
| 2021 | 186 | 199 |
| 2022 | 144 | 179 |
| 2023 | 160 | 219 |
| 2024 | 237 | 296 |
| 2025 | 221 | 223 |
| 2026 | 148 | 164 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Sound device6 Oct 2026US 12,756,981 B2AAC Microtech (Changzhou) Co., Ltd.
- Loudspeaker and loudspeaker manufacturing method29 Sep 2026US 12,750,614 B2Panasonic Automotive Systems Co., Ltd.
- Micro speaker structure including diaphragm with locally thinner regions and method for forming the same22 Sep 2026US 12,745,043 B2Fortemedia, Inc.
- Apparatus15 Sep 2026US 12,739,565 B2LG Display Co., Ltd.
- Earphones and transducer devices thereof15 Sep 2026US 12,739,566 B2Shenzhen Shokz Co., Ltd.
- Full-bandwidth dual-sided speaker device8 Oct 2026US 2026/0313288 A1Merry Electronics (Suzhou) Co., Ltd.
- Loudspeaker with phase plug8 Oct 2026US 2026/0313292 A1Ask Industries Societa' Per Azioni
- Loudspeakers and methods of use thereof8 Oct 2026US 2026/0313298 A1Clean Energy Labs, LLC
- Full-bandwidth dual-sided speaker device1 Oct 2026US 2026/0304025 A1Merry Electronics (Suzhou) Co., Ltd.
- Full-bandwidth dual-sided speaker device1 Oct 2026US 2026/0304026 A1Merry Electronics (Suzhou) Co., Ltd.
Most cited
By later US patents
- Acoustic device295US 6,332,029 B1New Transducers Limited · 2001
- Acoustic device206US 7,158,647 B2New Transducers Limited · 2007
- Positionally sequenced loudspeaker system178US 8,284,982 B2Induction Speaker Technology, LLC · 2012
- Vibration actuator having an elastic member between a suspension plate and a magnetic circuit device159US 6,850,138 B1NEC Tokin Corporation · 2005
- Vibration generating apparatus118US 5,894,263 AMatsushita Electric Industrial Co., Ltd. · 1999