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Class Information
Number: 181/177
Name: Acoustics > Sound-modifying means > Intensifying horn
Description: Subject matter comprising a hollow member open at opposite ends and having a progressively increasing cross sectional area from one end to the other. Sound is introduced at the smaller open end and emerges increased in loudness at the larger open end.










Sub-classes under this class:

Class Number Class Name Patents
181/178 Collapsible 17
181/184 Having apertures in walls 30
181/180 Material 14
181/189 Multisection housing 24
181/192 Particular shape of the horn 74
181/187 Plural intensifying portions 48
181/191 With external sound deflector 40
181/179 With particular mounting structure 35
181/182 With resonant chamber 39
181/185 With sound-path restriction 43
181/181 With vibratory filaments 3


Patents under this class:

Patent Number Title Of Patent Date Issued
8649544 Phasing plug for a compression driver Feb. 11, 2014
8548184 Constant coverage waveguide Oct. 1, 2013
8488826 Horn enclosure for combining sound output Jul. 16, 2013
8479873 Loudspeaker Jul. 9, 2013
8469140 Radial waveguide for double cone transducers Jun. 25, 2013
8327974 Sound enhancing apparatus Dec. 11, 2012
8256568 Protective sleeve having an external sound-amplifying member Sep. 4, 2012
8194904 Speaker system with broad directivity Jun. 5, 2012
7936892 Constant coverage waveguide May. 3, 2011
7708112 Waveguide phase plug May. 4, 2010
7506721 Convertible folded horn enclosure Mar. 24, 2009
7454030 Subwoofer with cascaded linear array of drivers Nov. 18, 2008
7299893 Loudspeaker horn and method for controlling grating lobes in a line array of acoustic sources Nov. 27, 2007
7252176 Reflex-ported folded horn enclosure Aug. 7, 2007
7095868 Phase plug with optimum aperture shapes Aug. 22, 2006
7027605 Mid-range loudspeaker Apr. 11, 2006
6837334 Acoustic horn Jan. 4, 2005
6668969 Manifold for a horn loudspeaker and method Dec. 30, 2003
6658128 Horn loudspeaker Dec. 2, 2003
6574344 Directional horn speaker system Jun. 3, 2003
6530451 System of elements for the diffusion of sound in rooms deligated to the reproduction of music and speech Mar. 11, 2003
6519348 Speaker apparatus and television set Feb. 11, 2003
6516076 Modular horn loudspeaker Feb. 4, 2003
6478109 Laminated composite panel-form loudspeaker Nov. 12, 2002
6466680 High-frequency loudspeaker module for cinema screen Oct. 15, 2002
6394223 Loudspeaker with differential energy distribution in vertical and horizontal planes May. 28, 2002
6368553 Ultrasonic force differentiation assay Apr. 9, 2002
6334505 Optimum edges for speakers and musical instruments Jan. 1, 2002
6129173 Personal removable mouthpiece for a voice amplification instrument and method of using same Oct. 10, 2000
6059069 Loudspeaker waveguide design May. 9, 2000
5991421 Radially expanding multiple flat-surfaced waveguide device Nov. 23, 1999
5910648 Sound generator Jun. 8, 1999
5828627 Method of and apparatus for producing spherical waves in the ultrasonic range Oct. 27, 1998
5726396 Folded acoustical horn Mar. 10, 1998
5540248 Fluidic sound amplification system Jul. 30, 1996
5501363 Combination drinking cup and megaphone Mar. 26, 1996
5351220 Moving-coil electrodynamic electroacoustical transducer Sep. 27, 1994
5327985 Acoustical transducer enclosure Jul. 12, 1994
4969196 Speaker and horn array Nov. 6, 1990
4964100 Acoustic detection system Oct. 16, 1990
4865159 Acoustic horn and attachment device Sep. 12, 1989
4808202 Adsorptive fiber sheet Feb. 28, 1989
4805732 Motor powered sound emitter Feb. 21, 1989
4739860 Ultrasonic rangefinder Apr. 26, 1988
4525604 Horn loudspeaker with convex diaphragm Jun. 25, 1985
4433398 Ultrasonic transducer Feb. 21, 1984
4378471 Horn speaker with linear grooves in a front surface of a pole piece of a yoke Mar. 29, 1983
4329905 Sound generating apparatus May. 18, 1982
4125218 Megaphone-cup Nov. 14, 1978











 
 
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