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Class Information
Number: 181/163
Name: Acoustics > Diaphragm > Plural dependent diaphragms
Description: Subject matter wherein two or more diaphragms are driven by the same mechanism, or arranged so that the sound waves produced by one cause the other to vibrate.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8611575 Speaker system method and apparatus Dec. 17, 2013
8396240 Baffle vibration reducing Mar. 12, 2013
8290198 Speaker device Oct. 16, 2012
8235167 Vibrating body for speaker and speaker device Aug. 7, 2012
8224016 Electroacoustic transducer having multi-channel diaphragm and hearing aid using the same Jul. 17, 2012
8009858 Loudspeaker Aug. 30, 2011
7986805 Acoustic diaphragm Jul. 26, 2011
7983436 Baffle vibration reducing Jul. 19, 2011
7970158 Sound system Jun. 28, 2011
7848533 Loudspeaker Dec. 7, 2010
7809148 Loudspeaker Oct. 5, 2010
7450976 Portable electronic device Nov. 11, 2008
7428946 Suspension and electro-acoustic transducer using the suspension Sep. 30, 2008
7392880 Dual range horn with acoustic crossover Jul. 1, 2008
7360626 Audio speaker with wobble free voice coil movement Apr. 22, 2008
7292702 In-wall speaker system method and apparatus Nov. 6, 2007
7225895 Audio speaker with wobble free voice coil movement Jun. 5, 2007
7185735 Audio speaker with wobble free voice coil movement Mar. 6, 2007
7158648 Loudspeaker system with extended bass response Jan. 2, 2007
6985593 Baffle vibration reducing Jan. 10, 2006
6920230 Electromagnetic transducer and portable communication device Jul. 19, 2005
6814181 Electrically conductive damper device for speaker Nov. 9, 2004
6782112 Low frequency transducer enclosure Aug. 24, 2004
6766027 Elliptical flushmount speaker Jul. 20, 2004
6672423 Speaker and method of assembling the speaker Jan. 6, 2004
6627805 Audio device and method including a membrane having at least two tongues with different resonant frequencies Sep. 30, 2003
6578661 Speaker apparatus Jun. 17, 2003
6513623 Speaker Feb. 4, 2003
6460651 Passive speaker system Oct. 8, 2002
6454046 Synchronous dustproof cover structure for sound membrane Sep. 24, 2002
6431309 Loudspeaker system Aug. 13, 2002
6343128 Dual cone loudspeaker Jan. 29, 2002
6188774 Loudspeaker Feb. 13, 2001
6026929 High frequency radially arcuated center speaker cone with variable thickness Feb. 22, 2000
5880412 High frequency radially arcuated center speaker cone Mar. 9, 1999
5847332 Polycarbonate-based radially arcuated speaker cone Dec. 8, 1998
5802191 Loudspeakers, systems, and components thereof Sep. 1, 1998
5719946 Loudspeaker for higher audio frequencies and a manufacturing method thereof Feb. 17, 1998
5635686 Composite speaker system having a directional adjustable tweeter Jun. 3, 1997
5629501 Composite speaker system having a directional adjustable transducer May. 13, 1997
5512714 Composite speaker system having a directional adjustable tweeter Apr. 30, 1996
5471437 Electrodynamic acoustic transducer Nov. 28, 1995
5283397 Diaphragm for electrodynamic transducer Feb. 1, 1994
5143169 Loudspeaker diaphragm provided with a rear load Sep. 1, 1992
5025885 Multiple chamber loudspeaker system Jun. 25, 1991
4930596 Loudspeaker system Jun. 5, 1990
4905788 Electro-acoustic transducers Mar. 6, 1990
4899390 Thin speaker having an enclosure within an open portion and a closed portion Feb. 6, 1990
4875546 Loudspeaker with acoustic band-pass filter Oct. 24, 1989
4847908 Loudspeaker having a two-part diaphragm for use as a car loudspeaker Jul. 11, 1989

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