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Class Information
Number: 181/182
Name: Acoustics > Sound-modifying means > Intensifying horn > With resonant chamber
Description: Subject matter including a compartment exterior to the basic horn shape, but in communication with the horn via a sound passage or a vibrating portion of the horn wall.










Sub-classes under this class:

Class Number Class Name Patents
181/183 Double wall 4


Patents under this class:

Patent Number Title Of Patent Date Issued
8649544 Phasing plug for a compression driver Feb. 11, 2014
8607922 High frequency horn having a tuned resonant cavity Dec. 17, 2013
8005517 Mobile communication device Aug. 23, 2011
7525794 Expandable acoustic chamber for computer systems Apr. 28, 2009
6981570 Loudspeaker system with common low and high frequency horn mounting Jan. 3, 2006
6836239 Method and system for displaying text on a radial display Dec. 28, 2004
6831984 Noise reducing Dec. 14, 2004
6807284 Speaker and speaker device Oct. 19, 2004
6648098 Spiral acoustic waveguide electroacoustical transducing system Nov. 18, 2003
6581719 Wave shaping sound chamber Jun. 24, 2003
6522759 Speaker Feb. 18, 2003
6430297 Speaker and speaker device Aug. 6, 2002
6425456 Hollow semicircularly curved loudspeaker enclosure Jul. 30, 2002
6335974 Speaker system for television receiver with sound ducts and perforated panels Jan. 1, 2002
6083075 Animal call device Jul. 4, 2000
6059069 Loudspeaker waveguide design May. 9, 2000
6001132 Preparation of aqueous solutions suitable for finishing cellulose containing textile materials Dec. 14, 1999
5932850 Speaker system Aug. 3, 1999
5929392 Speaker system Jul. 27, 1999
5805708 Speaker system for computer Sep. 8, 1998
5793000 Speaker system Aug. 11, 1998
5631450 Megaphone May. 20, 1997
5606297 Conical ultrasound waveguide Feb. 25, 1997
5550921 Stereo sound source for portable computer Aug. 27, 1996
5394478 Low frequency sound generation system for use in vehicular passenger compartments Feb. 28, 1995
5233136 Horn loadspeaker Aug. 3, 1993
5184332 Multiport underwater sound transducer Feb. 2, 1993
5179255 Baseball bat having the functions of resonators and microphones Jan. 12, 1993
5160815 Megaphone apparatus Nov. 3, 1992
5068836 Sound generating transducer Nov. 26, 1991
4989187 Acoustic apparatus Jan. 29, 1991
4987564 Acoustic apparatus Jan. 22, 1991
4546733 Resonator for internal combustion engines Oct. 15, 1985
4539947 Resonator for internal combustion engines Sep. 10, 1985
4421957 End-fire microphone and loudspeaker structures Dec. 20, 1983
4413253 Miniature sounder with double tuned cavity Nov. 1, 1983
4299304 Exponential folded horn speaker enclosure Nov. 10, 1981
4268718 Housing acoustical amplifier May. 19, 1981
4033431 Acoustic crossover speaker enclosure Jul. 5, 1977











 
 
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