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Class Information
Number: 381/339
Name: Electrical audio signal processing systems and devices > Electro-acoustic audio transducer > Having acoustic wave modifying structure > Sound intensifying or spreading element
Description: Subject matter wherein a) the amplitude of a sound wave is increased, or b) wherein the sound from the transducer is widely dispersed.


Sub-classes under this class:

Class Number Class Name Patents
381/340 Horn 110
381/344 Mouthpiece 28


Patents under this class:

Patent Number Title Of Patent Date Issued
7409071 Large-diameter arcuate speaker Aug. 5, 2008
7275621 Skew horn for a loudspeaker Oct. 2, 2007
7252176 Reflex-ported folded horn enclosure Aug. 7, 2007
7178629 Electroacoustic public address unit with acoustic horn or waveguide Feb. 20, 2007
7177437 Multiple aperture diffraction device Feb. 13, 2007
7167415 Transducers for focusing sonic energy in transmitting and receiving device Jan. 23, 2007
7134523 System for integrating mid-range and high-frequency acoustic sources in multi-way loudspeakers Nov. 14, 2006
7095868 Phase plug with optimum aperture shapes Aug. 22, 2006
7044265 Constant directivity acoustic horn May. 16, 2006
7039211 Horn-loaded compression driver system May. 2, 2006
7013019 Thermoset composite material baffle for loudspeaker Mar. 14, 2006
7010138 Loudspeakers Mar. 7, 2006
6798888 Mount for underwater acoustic projector Sep. 28, 2004
6785395 Speaker configuration for a portable electronic device Aug. 31, 2004
6756883 Extra loud low frequency acoustical alarm assembly Jun. 29, 2004
6754360 Signal-horn Jun. 22, 2004
6704425 System and method to enhance reproduction of sub-bass frequencies Mar. 9, 2004
6681023 Radial pickup microphone enclosure Jan. 20, 2004
6658127 Speaker system having an amplifying horn Dec. 2, 2003
6650760 Loudspeaker Nov. 18, 2003
6512450 Extra loud low frequency acoustical alarm assembly Jan. 28, 2003
6466680 High-frequency loudspeaker module for cinema screen Oct. 15, 2002
6393131 Loudspeaker May. 21, 2002
6343132 Loudspeaker Jan. 29, 2002
6059069 Loudspeaker waveguide design May. 9, 2000
6028947 Lightweight molded waveguide device with support infrastructure Feb. 22, 2000
5991421 Radially expanding multiple flat-surfaced waveguide device Nov. 23, 1999
5909490 Omnidirectional audio in a communications device Jun. 1, 1999
5878148 Compression driver Mar. 2, 1999
5828627 Method of and apparatus for producing spherical waves in the ultrasonic range Oct. 27, 1998
5825900 Loudspeaker housing for video display appliance Oct. 20, 1998
5818942 Multimedia stereo sound source Oct. 6, 1998
5809154 Ported loudspeaker system and method Sep. 15, 1998
5734728 Portable sound speaker system and driving circuit therefor Mar. 31, 1998
5604337 Loudspeaker arrangement in television receiver cabinet Feb. 18, 1997
5446793 Method of improving the quality of sound reproduction and apparatus for carrying at least one loudspeaker emitting in three directions Aug. 29, 1995
5274709 Speaker device for television receiver Dec. 28, 1993
5140641 Servo valve loudspeaker Aug. 18, 1992
5117463 Speaker system having directivity May. 26, 1992
4965839 Electro acoustic transducer and loudspeaker Oct. 23, 1990
4922541 Acoustic horn audio reproducer May. 1, 1990
4905276 Telephone earpiece extension attachment Feb. 27, 1990
4852682 Underwater voice communicator Aug. 1, 1989
4790020 Horn type loudspeakers Dec. 6, 1988
4445227 Loudspeaker having improved directional characteristics Apr. 24, 1984



 
 
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