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Class Information
Number: 381/341
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Sound intensifying or spreading element > Horn > Inverted, folded, or curled
Description: Subject matter in which a) a crossectional area of the sound conducting element decreases as a distance from a diaphragm increases, or b) the sound path of the element has one or more sharp bends, or c) an entrance of the element is smoothly curved back toward an exit.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7602934 |
Speaker system with built-in storage of satellite speakers |
Oct. 13, 2009 |
| 7520368 |
Horizontally folded reflex-ported bass horn enclosure |
Apr. 21, 2009 |
| 7513332 |
Convertible folded horn enclosure with improved compactness |
Apr. 7, 2009 |
| 7506721 |
Convertible folded horn enclosure |
Mar. 24, 2009 |
| 7454030 |
Subwoofer with cascaded linear array of drivers |
Nov. 18, 2008 |
| 7450733 |
Speaker with externally mounted acoustic extension |
Nov. 11, 2008 |
| 7252175 |
Speaker apparatus and manufacturing method of speaker apparatus |
Aug. 7, 2007 |
| 7252176 |
Reflex-ported folded horn enclosure |
Aug. 7, 2007 |
| 7233677 |
Top-loading folded corner horn |
Jun. 19, 2007 |
| 7190801 |
Horn loudspeaker |
Mar. 13, 2007 |
| 7142680 |
Multiple waveguide coaxial ceiling loudspeaker |
Nov. 28, 2006 |
| 7039212 |
Weather resistant porting |
May. 2, 2006 |
| 6973994 |
Apparatus for increasing the quality of sound from an acoustic source |
Dec. 13, 2005 |
| 6754360 |
Signal-horn |
Jun. 22, 2004 |
| 6658127 |
Speaker system having an amplifying horn |
Dec. 2, 2003 |
| 6634455 |
Thin-wall multi-concentric sleeve speaker |
Oct. 21, 2003 |
| 6393131 |
Loudspeaker |
May. 21, 2002 |
| 6389144 |
Sound field equalizing apparatus for speaker system |
May. 14, 2002 |
| 6144309 |
Alarm device with multiple indicators and flameproof housing |
Nov. 7, 2000 |
| 6127918 |
Buzzer with a sound film and equalizing or whirlpool sound mechanism |
Oct. 3, 2000 |
| 6078676 |
Speaker system with a three-dimensional spiral sound passage |
Jun. 20, 2000 |
| 6035051 |
Sound apparatus |
Mar. 7, 2000 |
| 5970158 |
Compact horn speaker |
Oct. 19, 1999 |
| 5898788 |
Loudspeaker system |
Apr. 27, 1999 |
| 5896460 |
Speaker |
Apr. 20, 1999 |
| 5822443 |
Speaker system for a television |
Oct. 13, 1998 |
| 5815589 |
Push-pull transmission line loudspeaker |
Sep. 29, 1998 |
| 5367576 |
Horn speaker |
Nov. 22, 1994 |
| 5012889 |
Speaker enclosure |
May. 7, 1991 |
| 4982436 |
Dual horn folded soundpath loudspeaker |
Jan. 1, 1991 |
| 4979219 |
Piezoelectric speakers |
Dec. 18, 1990 |
| 4969196 |
Speaker and horn array |
Nov. 6, 1990 |
| 4963855 |
Warning sound generating device |
Oct. 16, 1990 |
| 4893343 |
Dual diverging manifold loudspeaker system |
Jan. 9, 1990 |
| 4860367 |
Low frequency loud speaker |
Aug. 22, 1989 |
| 4853964 |
Electroacoustic apparatus for reproducing lowest to medium frequencies |
Aug. 1, 1989 |
| 4850452 |
Loudspeaker structure |
Jul. 25, 1989 |
| 4836327 |
Sound reinforcement enclosure employing cone loudspeaker with annular central loading member and coaxially mounted compression driver |
Jun. 6, 1989 |
| 4790408 |
Coiled exponential bass/midrange horn loudspeakers |
Dec. 13, 1988 |
| 4518826 |
Vandal-proof communication system |
May. 21, 1985 |
| 4485275 |
Inverted horn loudspeaker |
Nov. 27, 1984 |
| 4385211 |
Reflex horn speaker with a waterproofing device |
May. 24, 1983 |
| 4317009 |
Coldproof reflex horn speaker |
Feb. 23, 1982 |
| 4313032 |
Folded horn loudspeaker system |
Jan. 26, 1982 |
| 4138594 |
Small dimension low frequency folded exponential horn loudspeaker with unitary sound path and loudspeaker system including same |
Feb. 6, 1979 |
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