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Class Information
Number: 181/147
Name: Acoustics > Plural diaphragm sound sources > Three diaphragms
Description: Subject matter including at least three vibrated means per unit.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8515102 Line array loudspeaker Aug. 20, 2013
8511422 Flexible multiple speaker support apparatus Aug. 20, 2013
8284977 Multi chamber ported stereo speaker Oct. 9, 2012
8229155 Speaker assembly with directional adjustability Jul. 24, 2012
8224001 Line array loudspeaker Jul. 17, 2012
8167083 Reconfigurable loudspeaker enclosure May. 1, 2012
8144900 Speaker system Mar. 27, 2012
8094860 Portable sound box assembly Jan. 10, 2012
8050432 Sound system Nov. 1, 2011
7886867 Flexible multiple speaker support apparatus Feb. 15, 2011
7577265 Loudspeaker system providing improved sound presence and frequency response in mid and high frequency ranges Aug. 18, 2009
7553288 Sound and vibration transmission pad and system Jun. 30, 2009
7418104 Speaker system Aug. 26, 2008
7350618 Multimedia speaker product Apr. 1, 2008
7333626 Arbitrary coverage angle sound integrator Feb. 19, 2008
7225895 Audio speaker with wobble free voice coil movement Jun. 5, 2007
7185735 Audio speaker with wobble free voice coil movement Mar. 6, 2007
7134523 System for integrating mid-range and high-frequency acoustic sources in multi-way loudspeakers Nov. 14, 2006
6118883 System for controlling low frequency acoustical directivity patterns and minimizing directivity discontinuities during frequency transitions Sep. 12, 2000
6057659 Speaker apparatus May. 2, 2000
5874695 Speaker assembly Feb. 23, 1999
5847331 Omnidirectional loudspeaker Dec. 8, 1998
5802191 Loudspeakers, systems, and components thereof Sep. 1, 1998
5715322 Throat device interconnecting a plurality of drive units and a horn Feb. 3, 1998
5594804 Multiple cone type loudspeaker Jan. 14, 1997
5590214 Vertical array type speaker system Dec. 31, 1996
5553149 Theater sound for multimedia workstations Sep. 3, 1996
5374124 Multi-compound isobarik loudspeaker system Dec. 20, 1994
5324896 Audio loudspeaker system Jun. 28, 1994
5307418 Center channel speaker having multiple interconnected backload amplifying chambers for surround sound stereo audio systems Apr. 26, 1994
5258584 Multiple auxiliary compound driver loudspeaker system Nov. 2, 1993
5222145 Dual-chamber multi-channel speaker for surround sound stereo audio systems Jun. 22, 1993
5164549 Sonic wave generator Nov. 17, 1992
5000286 Modular loudspeaker system Mar. 19, 1991
4991687 Speaker system having directivity Feb. 12, 1991
4940108 Open line source speaker system Jul. 10, 1990
4923031 High output loudspeaker system May. 8, 1990
4890689 Omnidirectional speaker system Jan. 2, 1990
4884655 Tower-type speaker cabinet with pivoted plural speaker subassembly Dec. 5, 1989
4869340 Very high performance loudspeaker enclosures Sep. 26, 1989
4836326 Optimal shadow omniphonic microphone and loudspeaker system Jun. 6, 1989
4792978 Planar loudspeaker system Dec. 20, 1988
4787472 Audio speaker apparatus Nov. 29, 1988
4733749 High output loudspeaker for low frequency reproduction Mar. 29, 1988
4730694 Electro-mechanical reproduction of sound Mar. 15, 1988
4673057 Geometrical transducer arrangements Jun. 16, 1987
4657107 Loudspeaker cabinet Apr. 14, 1987
4653606 Electroacoustic device with broad frequency range directional response Mar. 31, 1987
4637490 Jellyfish array Jan. 20, 1987
4629029 Multiple driver manifold Dec. 16, 1986

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