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Class Information
Number: 181/185
Name: Acoustics > Sound-modifying means > Intensifying horn > With sound-path restriction
Description: Subject matter including structure within the horn which constitutes an obstruction to the sound waves.










Sub-classes under this class:

Class Number Class Name Patents
181/186 Adjustable 11


Patents under this class:

Patent Number Title Of Patent Date Issued
8663530 Water-proof sound-transmitting membrane, method for producing water-proof sound-transmitting membrane, and electrical appliance using the membrane Mar. 4, 2014
8649544 Phasing plug for a compression driver Feb. 11, 2014
8290195 Acoustic radiation pattern adjusting Oct. 16, 2012
8094855 Inverse horn loudspeakers Jan. 10, 2012
7735599 Sound wave guide structure for speaker system and horn speaker Jun. 15, 2010
7708112 Waveguide phase plug May. 4, 2010
7631724 Sound-wave path-length correcting structure for speaker system Dec. 15, 2009
7510049 Acoustic transformer and method for transforming sound waves Mar. 31, 2009
7387079 Automatic horn shutter Jun. 17, 2008
7178629 Electroacoustic public address unit with acoustic horn or waveguide Feb. 20, 2007
7095868 Phase plug with optimum aperture shapes Aug. 22, 2006
7044265 Constant directivity acoustic horn May. 16, 2006
6912290 Speaker unit for low frequency reproduction Jun. 28, 2005
6836239 Method and system for displaying text on a radial display Dec. 28, 2004
6574344 Directional horn speaker system Jun. 3, 2003
6549637 Loudspeaker with differential flow vent means Apr. 15, 2003
6343132 Loudspeaker Jan. 29, 2002
6026928 Apparatus and method for reduced distortion loudspeakers Feb. 22, 2000
6001132 Preparation of aqueous solutions suitable for finishing cellulose containing textile materials Dec. 14, 1999
5837890 Jet engine test cell structure Nov. 17, 1998
5778084 Loudspeaker with phase correction Jul. 7, 1998
5740259 Pressure wave transducing Apr. 14, 1998
5404784 Apparatus for modifying the percussive sound emanating from a drum Apr. 11, 1995
5351220 Moving-coil electrodynamic electroacoustical transducer Sep. 27, 1994
5163167 Sound wave guide Nov. 10, 1992
5117462 Phasing plug for compression driver May. 26, 1992
4975965 Loudspeaker design Dec. 4, 1990
4930596 Loudspeaker system Jun. 5, 1990
4882562 Adaptor for coupling plural compression drivers to a common horn Nov. 21, 1989
4840250 Acoustic impedance inducing device Jun. 20, 1989
4790020 Horn type loudspeakers Dec. 6, 1988
4776428 Sound projection system Oct. 11, 1988
4718517 Loudspeaker and acoustic transformer therefor Jan. 12, 1988
4713799 Ultrasonic horn with sidelobe suppressing centerpiece Dec. 15, 1987
4685532 Constant directivity loudspeaker horn Aug. 11, 1987
RE32183 Sound projection system Jun. 17, 1986
4525872 Amplifier Jun. 25, 1985
4390078 Loudspeaker horn Jun. 28, 1983
4325456 Acoustical transformer for compression-type loudspeaker with an annular diaphragm Apr. 20, 1982
4310065 Radial horn Jan. 12, 1982
4181193 Sound projection system Jan. 1, 1980
4091891 Horn speaker May. 30, 1978
4050541 Acoustical transformer for horn-type loudspeaker Sep. 27, 1977











 
 
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