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| Number | Title | Issue Date |
| 7350618 | Multimedia speaker product A satellite speaker system includes a side firing low mid driver mounted in a sub-enclosure which is vented into a second sub-enclosure through an acoustic resistance vent and to a third sub-enclosure through a variable aperture second vent. The vents further serve ... | 04/01/2008 |
| 7085392 | Loudspeaker sound modulation appliance In combination with a loudspeaker assembly that includes a speaker diaphragm that is displaced to produce sound, the combination comprising a spinner element mounted to rotate in the path of sound waves produced by the speaker diaphragm; and a rotary drive for rotat... | 08/01/2006 |
| 7012506 | Ultrasonic pest repeller A pest repeller including at least a first ultrasound transmitter mounted on a base and a second transmitter rotatably mounted above the first transmitter. Both transmitters can be rotatably mounted on a common post carried by the base. The arrangements permit a gre... | 03/14/2006 |
| 6520280 | System and method for workspace sound regulation A system (and method) for workspace sound regulation, includes an office enclosure having a plurality of barriers, the barriers including reflective surfaces, and the reflective surfaces creating a plurality of preferred locations in the enclosure.... | 02/18/2003 |
| 5146434 | Sound focusing device A sound focusing device for use with a siren. The device is comprised of an adjustable baffle or damper reducing the velocity of air or sound eminating from a siren. The baffle or damper is positioned internal to the siren. A conical sound focusing trumpe... | 09/08/1992 |
| 4847590 | Outdoor warning siren An improved outdoor warning siren comprising an electromechanical siren together with a multi-segment horn which effects an exceptionally smooth transition from a small high pressure area at the horn inlet to a larger low pressure area at the horn outlet ... | 07/11/1989 |
| 4718372 | Vehicle warning system A vehicle warning system (1) is disclosed. The device includes a main housing (2) to which is attached a sound generator (7), a lighting system (5), a mounting bracket (4) which is used to attach the device to an energency vehicle, and a trim ring (6) whi... | 01/12/1988 |
| 4689609 | Electronic horn with spiral deflecting walls coupled to a truncated cone structure An electronic horn of compact dimensions. Oscillator circuits coupled to a mixing node produce a multiple frequency signal used to drive a horn transducer. One horn replaces the two horns used in the prior art. A reverberating chamber in close proximity t... | 08/25/1987 |
| 4635039 | Low drag warning system for emergency vehicles A low drag warning system for emergency vehicles having an aerodynamic design reducing turbulent flow past the housing for increased fuel economy and performance. The housing of the warning light system is provided with a pair of light globe compartments ... | 01/06/1987 |
| 4554531 | Omnidirectional siren The stator of the sound generator in the siren of this invention is mounted on struts that diverge upwardly from the top of an upright post, with its axis coinciding with that of the post. The coaxial rotor of the sound generator is driven by a motor moun... | 11/19/1985 |
| 4432299 | Impulse noise generator An impulse noise generator having means to store a volume of compressed gas and suddenly to release same to eject through a nozzle (14) comprising a body (4) having a hollow stepped piston (1) arranged to move forward by gas pressure admitted through an i... | 02/21/1984 |
| 4334211 | Speaker grille for streamlined light bar mounted on vehicle roof An improved speaker grille for incorporation in the housing of a light/siren assembly of a type which is mounted across the roof of a police car or other emergency vehicle, the improved grille being designed to significantly reduce the drag coefficient of... | 06/08/1982 |
| 4253368 | Universal pulsato unit An improved mounting for an acoustic pulsato rotor for suppression of spurious sounds utilizes a spring bias for axial thrust between the shaft ends and bearing cups. In one form, a plurality of thin spider legs extend from a rotor mounting panel in surro... | 03/03/1981 |
| 4035582 | Tremolo effect producing system A tremolo effect producing system comprises at least one electro-acoustic transducer such as a loudspeaker for converting an electrical audio signal to a sound, at least one acousto-electrical transducer such as a microphone for converting sound to an ele... | 07/12/1977 |
| 3961684 | Omni-directional sound system An omni-directional sound system having means to create a high compression zone of low-frequency sound and a speaker-baffle assembly rotatable in said zone and emanating high-frequency sound. A feature includes a grill assembly to create the compression z... | 06/08/1976 |
