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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:
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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