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Class Information
Number: 181/188
Name: Acoustics > Sound-modifying means > Intensifying horn > Plural intensifying portions > Similar portions
Description: Subject matter wherein the plural intensifying portions have substantially the same shape or are mirror images of one another.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7299893 |
Loudspeaker horn and method for controlling grating lobes in a line array of acoustic sources |
Nov. 27, 2007 |
| 6905001 |
Sounders for fire alarm systems |
Jun. 14, 2005 |
| 6393131 |
Loudspeaker |
May. 21, 2002 |
| 5804774 |
Ported reflex horn |
Sep. 8, 1998 |
| 5675133 |
Horn and sounder |
Oct. 7, 1997 |
| 5397866 |
Dual acoustic horn assembly |
Mar. 14, 1995 |
| 5220608 |
Method and means for stereophonic sound reproduction |
Jun. 15, 1993 |
| 5160815 |
Megaphone apparatus |
Nov. 3, 1992 |
| 5004067 |
Cinema sound system for unperforated screens |
Apr. 2, 1991 |
| 4997058 |
Sound transducer |
Mar. 5, 1991 |
| 4969196 |
Speaker and horn array |
Nov. 6, 1990 |
| 4908601 |
Loud speaker with horizontal radiation pattern |
Mar. 13, 1990 |
| 4893343 |
Dual diverging manifold loudspeaker system |
Jan. 9, 1990 |
| 4878561 |
Sound emitter |
Nov. 7, 1989 |
| 4847590 |
Outdoor warning siren |
Jul. 11, 1989 |
| 4776428 |
Sound projection system |
Oct. 11, 1988 |
| 4390078 |
Loudspeaker horn |
Jun. 28, 1983 |
| 4299304 |
Exponential folded horn speaker enclosure |
Nov. 10, 1981 |
| 4174019 |
Dual speaker |
Nov. 13, 1979 |
| 4091891 |
Horn speaker |
May. 30, 1978 |
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