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Class Information
Number: 181/184
Name: Acoustics > Sound-modifying means > Intensifying horn > Having apertures in walls
Description: Subject matter wherein the horn has sides which are provided with openings.

Patents under this class:

Patent Number Title Of Patent Date Issued
8649544 Phasing plug for a compression driver Feb. 11, 2014
8130994 Waveguide Mar. 6, 2012
7813770 Speaker module design Oct. 12, 2010
7181025 Ultrasound based parametric loudspeaker system Feb. 20, 2007
7134523 System for integrating mid-range and high-frequency acoustic sources in multi-way loudspeakers Nov. 14, 2006
7130438 Acoustic enclosure for single audio transducer Oct. 31, 2006
6986260 Electrical fan system for vehicle Jan. 17, 2006
6931143 Thin enclosure electroacoustical transducing Aug. 16, 2005
6628790 Apparatus for on-ear operation and off-ear operation with two sound reproduction transducers Sep. 30, 2003
6160897 Apparatus for operation in an on-ear mode and an off-ear mode Dec. 12, 2000
6116373 Acoustic horns for loudspeakers Sep. 12, 2000
5945642 Acoustic horn Aug. 31, 1999
5837890 Jet engine test cell structure Nov. 17, 1998
5740259 Pressure wave transducing Apr. 14, 1998
5659155 Acoustical transducer enclosure Aug. 19, 1997
5327985 Acoustical transducer enclosure Jul. 12, 1994
5233136 Horn loadspeaker Aug. 3, 1993
5179255 Baseball bat having the functions of resonators and microphones Jan. 12, 1993
5137110 Highly directional sound projector and receiver apparatus Aug. 11, 1992
5115883 Loudspeaker May. 26, 1992
4989187 Acoustic apparatus Jan. 29, 1991
4987564 Acoustic apparatus Jan. 22, 1991
4893695 Speaker system Jan. 16, 1990
4619342 Multiple sound transducer system utilizing an acoustic filter to reduce distortion Oct. 28, 1986
4421957 End-fire microphone and loudspeaker structures Dec. 20, 1983
4419545 Electret transducer Dec. 6, 1983
4381831 High frequency horn May. 3, 1983
4299304 Exponential folded horn speaker enclosure Nov. 10, 1981
4283606 Coaxial loudspeaker system Aug. 11, 1981
3944757 High-fidelity moving-coil loudspeaker Mar. 16, 1976

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