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Class Information
Number: 181/180
Name: Acoustics > Sound-modifying means > Intensifying horn > Material
Description: Subject matter wherein the horn is constructed of a specific material or materials.

Patents under this class:

Patent Number Title Of Patent Date Issued
8028790 Sound projection device attachable to a user when not in use Oct. 4, 2011
7984842 Megaphone popcorn cup Jul. 26, 2011
7588121 Flexible polyurethane foam and process for its production Sep. 15, 2009
6724904 Microphone mounting assembly Apr. 20, 2004
5967405 Megaphone cup Oct. 19, 1999
5117463 Speaker system having directivity May. 26, 1992
4893695 Speaker system Jan. 16, 1990
4703829 Collapsible and portable megaphone Nov. 3, 1987
4433750 Synthetic horn projector with metal insert Feb. 28, 1984
4369857 Loudspeaker and horn combination Jan. 25, 1983
4206831 Loudspeaker coupler Jun. 10, 1980
4125218 Megaphone-cup Nov. 14, 1978
4063614 Combination loudspeaker and sign holder Dec. 20, 1977
3982607 Loudspeaker cabinet having an integrally constructed horn Sep. 28, 1976

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