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Class Information
Number: 181/193
Name: Acoustics > Sound-modifying means > Intensifying horn > Particular shape of the horn > Spiral sound path
Description: Subject matter wherein the wall of the horn is arranged to provide a spiral sound path.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
7617794	One piece horn cover	Nov. 17, 2009
7284638	Loudspeaker low profile quarter wavelength transmission line and enclosure and method	Oct. 23, 2007
6973994	Apparatus for increasing the quality of sound from an acoustic source	Dec. 13, 2005
6648098	Spiral acoustic waveguide electroacoustical transducing system	Nov. 18, 2003
6356643	Electro-acoustic transducer	Mar. 12, 2002
4689609	Electronic horn with spiral deflecting walls coupled to a truncated cone structure	Aug. 25, 1987
4206831	Loudspeaker coupler	Jun. 10, 1980