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| Number | Title | Issue Date |
| 7066106 | Reverberating mechanical siren A small light mechanical siren for mobile emergency equipment which utilize spiral rebound ramps in the rotor to produce a loud penetrating square form spiral sound wave, enabling effective warning without contributing to noise pollution. ... | 06/27/2006 |
| 5675311 | Frequency sweeping audio signal device An audio signal is generated that sweeps from a lower frequency to a higher frequency in a substantially linear function. The circuit used to produce this sweeping audio frequency has a stable power supply, a square wave oscillator, a ramp generator, a vo... | 10/07/1997 |
| 5188445 | Vehicle having warning units mounted within hood cutouts An emergency response vehicle such as an ambulance is provided with a warning unit that provides a visual and audible warning signal. The warning unit is mounted in a recess or cutout in the hood which covers the engine compartment of the vehicle. This po... | 02/23/1993 |
| 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 |
| 5140304 | Siren sound sychronized light bar system A light bar system for a motor vehicle including a plurality of forward-facing lights and a plurality of rear-facing lights transversely spaced on a bar across a motor vehicle, sequentially operating the forward-facing lights in a pattern moving from one ... | 08/18/1992 |
| 4980837 | Circuit and method for automatically sweeping through a plurality of siren modes A distinguishable siren sound pattern is produced within an emergency vehicle by automatically alternating the siren sound pattern from among a plurality of distinguishable types of separate siren sound patterns. One of said plurality of distinguishable t... | 12/25/1990 |
| 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 |
| 4831357 | Siren sound sychronized light bar system A light bar system for a motor vehicle includes a plurality of forward-facing lights and a plurality of rear-facing lights transversely spaced on a bar across a motor vehicle, the forward-facing lights sequentially operated in a pattern moving from one li... | 05/16/1989 |
| 4807203 | Siren A siren comprises a compressed air supply which is deflected by stationary deflectors to exit radially through stator ports. A rotor with spaced ports rotates between the stator and deflector thereby opening and closing the stator ports. Stationary vanes ... | 02/21/1989 |
| 4709652 | Pneumatic audio sweep generator A pneumatic sweep generator for use as an audio source in tests near vocal frequency ranges. A horn, whose volume may be controlled by air pressure and whose tone may be controlled by air velocity, is connected to an air supply in a dual-circuit arrangeme... | 12/01/1987 |
| 4691194 | Electric alarm siren with arc-like runner legs An electric alarm siren of low power has a relatively high sound intensity and a good timbre due to a runner with arch-shaped blades. The electric alarm siren includes a central part which is divided by a partition wall into a driving part with a built-in moto... | 09/01/1987 |
| 4649853 | Siren A siren comprises a compressed air supply which is deflected by stationary deflectors to exit radially through stator ports. A rotor with spaced ports rotates between the stator and deflector thereby opening and closing the stator ports. Stationary vanes ... | 03/17/1987 |
| 4615530 | Method of sealing between relatively movable components A siren comprises a compressed air supply which is deflected by stationary deflectors to exit radially through stator ports. A rotor with spaced ports rotates between the stator and deflector thereby opening and closing the stator ports. Stationary vanes ... | 10/07/1986 |
| 4558656 | Siren A siren comprises a compressed air supply which is deflected by stationary deflectors to exit radially through stator ports. A rotor with spaced ports rotates between the stator and deflector thereby opening and closing the stator ports. Stationary vanes ... | 12/17/1985 |
| 4529969 | Siren An improved siren including means for producing and directing sound energy against a rotatable reflector which directs the sound waves out from the siren in a generally horizontal direction and which due to rotation of the reflector about a vertical axis ... | 07/16/1985 |
| 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 |
| 4198706 | Generation of low frequency sound under water 1. Apparatus for the generation of sound under water including a siren coising a cylindrical stator casing open at each end and having at least one radial port and a cylindrical rotor member open at each end and mounted concentrically with respect to sai... | 04/15/1980 |
| 4138673 | Small siren having protective screen A siren for an alarm adapted to be driven by a fractional horsepower motor and provided with a cup shaped rotor cooperating with a stator provided with perforations in the cylindrical flange thereof, and a drawn, cup-shaped screen or grille seated over th... | 02/06/1979 |
| 4007805 | Cavity producing underwater sound source 1. An acoustical source for minesweeping operations comprising a stator ing outer and inner surfaces which are surfaces of revolution and an open port connecting said outer and inner surfaces, an external rotor adapted to be rotated around said outer sur... | 02/15/1977 |
| 3991703 | Siren for alarm and method of making the same A siren for an alarm adapted to be driven by a fractional horsepower motor comprising a cup-shaped rotor cooperating with a stator having rectangular perforations in a cylindrical flange, the cup-shaped rotor and the stator being both formed as stampings,... | 11/16/1976 |
