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Class Information
Number: 181/144
Name: Acoustics > Plural diaphragm sound sources
Description: Subject matter including at least two separate means that can be vibrated by sound waves or produce sound waves.


Sub-classes under this class:

Class Number Class Name Patents
181/145 Plural chambers 131
181/147 Three diaphragms 79
181/146 With sound-asborbing means 70


Patents under this class:
1 2 3 4 5

Patent Number Title Of Patent Date Issued
7392880 Dual range horn with acoustic crossover Jul. 1, 2008
7350618 Multimedia speaker product Apr. 1, 2008
7343018 System of sound transducers with controllable directional properties Mar. 11, 2008
7333626 Arbitrary coverage angle sound integrator Feb. 19, 2008
7328769 Rigging system for loudspeaker arrays Feb. 12, 2008
7301094 Device for driving vibration source Nov. 27, 2007
7261180 Rigging system for speaker cabinets Aug. 28, 2007
7204799 Microphone optimized for implant use Apr. 17, 2007
7188703 Device for establishing noise in a motor vehicle Mar. 13, 2007
7151836 Speaker apparatus and sound reproduction apparatus Dec. 19, 2006
7134523 System for integrating mid-range and high-frequency acoustic sources in multi-way loudspeakers Nov. 14, 2006
7130432 Speaker mounting system and method Oct. 31, 2006
7092541 Surround sound loudspeaker system Aug. 15, 2006
7021419 Speaker system Apr. 4, 2006
7011178 Sound transmitter and speaker Mar. 14, 2006
6961438 Loudspeaker system having wide-directional characteristics Nov. 1, 2005
6870942 Loudspeaker for line array sound system Mar. 22, 2005
6834113 Loudspeaker system Dec. 21, 2004
6816065 Electromechanical horn warning system Nov. 9, 2004
6766027 Elliptical flushmount speaker Jul. 20, 2004
6721431 Prismatic loudspeaker/microphone array Apr. 13, 2004
6704426 Loudspeaker system Mar. 9, 2004
6678384 Speaker structure Jan. 13, 2004
6675931 Low profile audio speaker Jan. 13, 2004
6655495 Loudspeaker damper and loudspeaker Dec. 2, 2003
6647122 Loudspeaker drive unit Nov. 11, 2003
6643379 Acoustical transducer for recreating a spatial sound stage and improved localization of original sounds sources Nov. 4, 2003
6640924 Rigging system for loudspeakers Nov. 4, 2003
6628793 Speaker system Sep. 30, 2003
6621909 Horn loudspeaker and loudspeaker systems Sep. 16, 2003
6560936 Aircraft engine run-up hangar May. 13, 2003
6536554 Loudspeaker Mar. 25, 2003
6493452 Speaker unit Dec. 10, 2002
6431308 High fidelity small omnidirectional loudspeaker Aug. 13, 2002
6411718 Sound reproduction employing unity summation aperture loudspeakers Jun. 25, 2002
6393132 Speaker May. 21, 2002
6356640 Direction adjusting arrangement for tweeter Mar. 12, 2002
6356642 Multi-speaker system Mar. 12, 2002
6298942 Housing having a loudspeaker system Oct. 9, 2001
6279678 Speaker assembly Aug. 28, 2001
6222929 Speaker having middle-high sound speakers Apr. 24, 2001
6186269 Mini surround sound loudspeaker Feb. 13, 2001
6169811 Bandpass loudspeaker system Jan. 2, 2001
6152257 Audio speaker Nov. 28, 2000
6118883 System for controlling low frequency acoustical directivity patterns and minimizing directivity discontinuities during frequency transitions Sep. 12, 2000
6095279 Loudspeaker system Aug. 1, 2000
6064744 Omni-directional loudspeaker May. 16, 2000
6057659 Speaker apparatus May. 2, 2000
6056083 Loudspeakers in architectural form May. 2, 2000
6026927 Speaker assembly Feb. 22, 2000

1 2 3 4 5


 
 
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