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Class Information
Number: 181/143
Name: Acoustics > Moving sound producer or deflector
Description: Subject matter for continuously moving a sound source (e.g., loudspeaker) or for continuously moving a sound reflector located in the sound path.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6520280 |
System and method for workspace sound regulation |
Feb. 18, 2003 |
| 5146434 |
Sound focusing device |
Sep. 8, 1992 |
| 4847590 |
Outdoor warning siren |
Jul. 11, 1989 |
| 4718372 |
Vehicle warning system |
Jan. 12, 1988 |
| 4689609 |
Electronic horn with spiral deflecting walls coupled to a truncated cone structure |
Aug. 25, 1987 |
| 4635039 |
Low drag warning system for emergency vehicles |
Jan. 6, 1987 |
| 4554531 |
Omnidirectional siren |
Nov. 19, 1985 |
| 4432299 |
Impulse noise generator |
Feb. 21, 1984 |
| 4334211 |
Speaker grille for streamlined light bar mounted on vehicle roof |
Jun. 8, 1982 |
| 4253368 |
Universal pulsato unit |
Mar. 3, 1981 |
| 4035582 |
Tremolo effect producing system |
Jul. 12, 1977 |
| 3961684 |
Omni-directional sound system |
Jun. 8, 1976 |
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