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Class Information
Number: 381/349
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Acoustic enclosure > Bass reflex (e.g., rear wave)
Description: Subject matter in which a non-primary sound radiation path from the transducer"s diaphragm is vented to ambient through the housing or cavity.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7610991 |
Speaker and method of outputting acoustic sound |
Nov. 3, 2009 |
| 7578367 |
Speaker set and electronic product incorporating the same |
Aug. 25, 2009 |
| 7578368 |
Speaker set for electronic product |
Aug. 25, 2009 |
| 7556121 |
Speaker set and mobile phone incorporating the same |
Jul. 7, 2009 |
| 7536024 |
Loudspeaker |
May. 19, 2009 |
| 7508933 |
Resonance chamber of a cellular phone |
Mar. 24, 2009 |
| 7503422 |
Expandable speaker enclosure |
Mar. 17, 2009 |
| 7481295 |
Speaker system and speaker enclosure |
Jan. 27, 2009 |
| 7477755 |
Speaker system |
Jan. 13, 2009 |
| 7461718 |
Loudspeaker enclosure incorporating a leak to compensate for the effect of acoustic modes on loudspeaker frequency response |
Dec. 9, 2008 |
| 7463747 |
Loudspeaker system |
Dec. 9, 2008 |
| 7454025 |
Loudspeaker with internal negative stiffness mechanism |
Nov. 18, 2008 |
| 7448467 |
Acoustic enclosures |
Nov. 11, 2008 |
| 7436972 |
Folded coaxial transmission line loudspeaker |
Oct. 14, 2008 |
| 7416048 |
Portable terminal apparatus |
Aug. 26, 2008 |
| 7418104 |
Speaker system |
Aug. 26, 2008 |
| 7410029 |
Bass reflex type loudspeaker apparatus, loudspeaker box and image display apparatus |
Aug. 12, 2008 |
| 7400910 |
Speaker sound enhancement for a mobile terminal |
Jul. 15, 2008 |
| 7284637 |
Low-frequency sound reproducing speaker apparatus |
Oct. 23, 2007 |
| 7269270 |
Standing wave reducing |
Sep. 11, 2007 |
| 7263387 |
Speaker module design |
Aug. 28, 2007 |
| 7252175 |
Speaker apparatus and manufacturing method of speaker apparatus |
Aug. 7, 2007 |
| 7218747 |
Externally ported loudspeaker enclosure |
May. 15, 2007 |
| 7201252 |
Loudspeaker systems |
Apr. 10, 2007 |
| 7142686 |
Compound sound generator |
Nov. 28, 2006 |
| 7133533 |
Passive acoustic radiating |
Nov. 7, 2006 |
| 7111706 |
Enclosure and audio-visual apparatus comprising same |
Sep. 26, 2006 |
| 7051835 |
Bass-reflex loudspeaker system and method of manufacturing the same |
May. 30, 2006 |
| 7039212 |
Weather resistant porting |
May. 2, 2006 |
| 7011178 |
Sound transmitter and speaker |
Mar. 14, 2006 |
| 6968067 |
Portable entertainment system |
Nov. 22, 2005 |
| 6955241 |
Speaker unit for low frequency reproduction |
Oct. 18, 2005 |
| 6907955 |
Electromagnetic electroacoustic transducer |
Jun. 21, 2005 |
| 6870942 |
Loudspeaker for line array sound system |
Mar. 22, 2005 |
| 6862360 |
Speaker system |
Mar. 1, 2005 |
| 6782112 |
Low frequency transducer enclosure |
Aug. 24, 2004 |
| 6763117 |
Speaker enclosure |
Jul. 13, 2004 |
| 6744902 |
Ported loudspeaker enclosure |
Jun. 1, 2004 |
| 6735320 |
Angled port loudspeaker |
May. 11, 2004 |
| 6704426 |
Loudspeaker system |
Mar. 9, 2004 |
| 6665413 |
Infrasonic Helmholtz resonator |
Dec. 16, 2003 |
| 6658127 |
Speaker system having an amplifying horn |
Dec. 2, 2003 |
| 6658129 |
Passive radiator having mass elements |
Dec. 2, 2003 |
| 6654472 |
Speaker system in display |
Nov. 25, 2003 |
| 6626263 |
Passive speaker system |
Sep. 30, 2003 |
| 6628799 |
Loudspeaker system |
Sep. 30, 2003 |
| 6625292 |
Ported loudspeaker enclosure |
Sep. 23, 2003 |
| 6625289 |
Stereo loudspeaker system |
Sep. 23, 2003 |
| 6618488 |
Speaker system |
Sep. 9, 2003 |
| 6597795 |
Device to improve loudspeaker enclosure duct |
Jul. 22, 2003 |
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