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Class Information
Number: 381/335
Name: Electrical audio signal processing systems and devices > Having non-electrical feature (e.g., mounting) > And loudspeaker > Plural diaphragms, compartments, or housings
Description: Subject matter in which there is a) more than one movable membrane within an enclosure, or b) an enclosure having more than one distinct volume, or c) more than one enclosure.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6721430 |
Musical bench |
Apr. 13, 2004 |
| 6719090 |
Speaker assembly |
Apr. 13, 2004 |
| 6704426 |
Loudspeaker system |
Mar. 9, 2004 |
| 6650758 |
Adaptive dual port loudspeaker implementation for reducing lateral transmission |
Nov. 18, 2003 |
| 6643379 |
Acoustical transducer for recreating a spatial sound stage and improved localization of original sounds sources |
Nov. 4, 2003 |
| 6628793 |
Speaker system |
Sep. 30, 2003 |
| 6504938 |
Dual-chamber loudspeaker |
Jan. 7, 2003 |
| 6496586 |
Thin Loudspeaker |
Dec. 17, 2002 |
| 6477356 |
Sounding-body holding device |
Nov. 5, 2002 |
| 6393132 |
Speaker |
May. 21, 2002 |
| 6373955 |
Loudspeakers |
Apr. 16, 2002 |
| 6339649 |
Loudspeaker system with stackable loudspeaker units |
Jan. 15, 2002 |
| 6298140 |
Electroacoustic transducer with improved tonal quality |
Oct. 2, 2001 |
| 6292573 |
Portable communication device with collapsible speaker enclosure |
Sep. 18, 2001 |
| 6259799 |
Speaker system |
Jul. 10, 2001 |
| 6222929 |
Speaker having middle-high sound speakers |
Apr. 24, 2001 |
| 6169811 |
Bandpass loudspeaker system |
Jan. 2, 2001 |
| 5953432 |
Line source speaker system |
Sep. 14, 1999 |
| 5889875 |
Electroacoustical transducing |
Mar. 30, 1999 |
| 5850460 |
Bass speaker |
Dec. 15, 1998 |
| 5388162 |
Sound innovation speaker system |
Feb. 7, 1995 |
| 5349575 |
Portable audio device |
Sep. 20, 1994 |
| 5335283 |
Loudspeaker apparatus for electronic keyboard musical instrument |
Aug. 2, 1994 |
| 5321756 |
Loudspeaker system with sonically powered drivers and centered feedback loudspeaker connected thereto |
Jun. 14, 1994 |
| 5309518 |
Multiple driver electroacoustical transducing |
May. 3, 1994 |
| 5307418 |
Center channel speaker having multiple interconnected backload amplifying chambers for surround sound stereo audio systems |
Apr. 26, 1994 |
| 5222145 |
Dual-chamber multi-channel speaker for surround sound stereo audio systems |
Jun. 22, 1993 |
| 5212732 |
Effects speaker system |
May. 18, 1993 |
| 5134660 |
Audio harness for video camera |
Jul. 28, 1992 |
| 5105906 |
Sound reproduction speaker with improved directional characteristics |
Apr. 21, 1992 |
| 5097514 |
Equilateral tetrahedral speaker system |
Mar. 17, 1992 |
| 5067159 |
Structure of a speaker apparatus |
Nov. 19, 1991 |
| 5058169 |
Public address system |
Oct. 15, 1991 |
| 5046104 |
Loudspeaker system |
Sep. 3, 1991 |
| 5025885 |
Multiple chamber loudspeaker system |
Jun. 25, 1991 |
| 5018206 |
Network mounting device for coaxial type speaker |
May. 21, 1991 |
| 4961226 |
Stereo electroacoustical transducing |
Oct. 2, 1990 |
| 4944019 |
Low sound region reproducing speaker system |
Jul. 24, 1990 |
| 4942939 |
Speaker system with folded audio transmission passage |
Jul. 24, 1990 |
| 4932060 |
Stereo electroacoustical transducing |
Jun. 5, 1990 |
| 4903300 |
Compact and efficient sub-woofer system and method for installation in structural partitions |
Feb. 20, 1990 |
| 4888804 |
Sound reproduction system |
Dec. 19, 1989 |
| 4882760 |
Sound reproduction system |
Nov. 21, 1989 |
| 4875546 |
Loudspeaker with acoustic band-pass filter |
Oct. 24, 1989 |
| 4847904 |
Ambient imaging loudspeaker system |
Jul. 11, 1989 |
| 4843624 |
Portable enclosure system for audio equipment |
Jun. 27, 1989 |
| 4837826 |
Stereophonic baffle |
Jun. 6, 1989 |
| 4805221 |
Construction of sound converter in sound guide, especially for loudspeakers, for example speaker boxes |
Feb. 14, 1989 |
| 4764961 |
Cassette type stereo speaker system |
Aug. 16, 1988 |
| 4764960 |
Stereo reproduction system |
Aug. 16, 1988 |
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