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Class Information
Number: 181/180
Name: Acoustics > Sound-modifying means > Intensifying horn > Material
Description: Subject matter wherein the horn is constructed of a specific material or materials.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7588121 |
Flexible polyurethane foam and process for its production |
Sep. 15, 2009 |
| 6724904 |
Microphone mounting assembly |
Apr. 20, 2004 |
| 5967405 |
Megaphone cup |
Oct. 19, 1999 |
| 5117463 |
Speaker system having directivity |
May. 26, 1992 |
| 4893695 |
Speaker system |
Jan. 16, 1990 |
| 4703829 |
Collapsible and portable megaphone |
Nov. 3, 1987 |
| 4433750 |
Synthetic horn projector with metal insert |
Feb. 28, 1984 |
| 4369857 |
Loudspeaker and horn combination |
Jan. 25, 1983 |
| 4206831 |
Loudspeaker coupler |
Jun. 10, 1980 |
| 4125218 |
Megaphone-cup |
Nov. 14, 1978 |
| 4063614 |
Combination loudspeaker and sign holder |
Dec. 20, 1977 |
| 3982607 |
Loudspeaker cabinet having an integrally constructed horn |
Sep. 28, 1976 |
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