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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 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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