H04R 2201/028
Structural combinations of loudspeakers with built-in power amplifiers
Official title: Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure (H04R2499/10 takes precedence; Single (sub)woofer with two or more satellite loudspeakers for mid- and high-frequency band reproduction driven via the (sub)woofer H04R2205/026)
H04R2201/028 (Structural combinations of loudspeakers with built-in power amplifiers) appears on 520 US grants and 671 published applications in this corpus.
Search patents in H04R- Granted patents
- 520
- Published applications
- 671
- Assignees
- 297
- Inventors
- 1,175
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
| 2006 | 1 | 8 |
| 2007 | 0 | 3 |
| 2008 | 4 | 6 |
| 2009 | 1 | 1 |
| 2010 | 0 | 15 |
| 2011 | 3 | 1 |
| 2012 | 14 | 13 |
| 2013 | 5 | 16 |
| 2014 | 6 | 21 |
| 2015 | 16 | 16 |
| 2016 | 20 | 27 |
| 2017 | 18 | 47 |
| 2018 | 41 | 62 |
| 2019 | 54 | 52 |
| 2020 | 44 | 49 |
| 2021 | 49 | 60 |
| 2022 | 56 | 71 |
| 2023 | 62 | 67 |
| 2024 | 43 | 54 |
| 2025 | 50 | 31 |
| 2026 | 27 | 48 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- System for controlling displacement of a loudspeaker176US 9,374,634 B2NXP B. V. · 2016
- Audio activity detection circuit to increase battery life in portable computers102US 5,822,598 AAST Research, Inc. · 1998
- Multiple channel sound system using multi-speaker arrays78US 8,363,865 B12013
- Multi-purpose lightbulb62US 9,784,417 B1Astro Corp. · 2017
- Audio driver and power supply unit architecture52US 9,930,444 B1Apple Inc. · 2018