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"There is practically no chance communications space satellites will be used to provide better telephone, telegraph, television, or radio service inside the United States."
T. Craven, FCC Commissioner ; 1961
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| Number | Title | Issue Date |
| 5517173 | Apparatus generating noise sound for electric car An apparatus for generating a noise sound, which is equipped in industrial electric cars with little or no driving sound and generates an appropriate amount of noise sound so that the nearby cars or pedestrians can notice their approch in a narrow pathway... | 05/14/1996 |
| 5140641 | Servo valve loudspeaker Low frequency, high intensity sound is produced using a conduit having a flow of high velocity and low pressure air. A pair of sound ports are provided in the conduit, and a rotary valve connected to a reversible servomotor and audio source is employed to... | 08/18/1992 |
| 4642611 | Sound engine A sound engine comprising a firing chamber, an output horn, an igniter, a valve system, an electromagnetic control device, and a source of electrical signal impulses. The igniter is mounted about the firing chamber. The valve system is arranged generally ... | 02/10/1987 |
| 4247844 | Alarm light An alarm light includes a lamp, an alarm, and an actuator moveable for actuating the lamp and alarm. The alarm is powered by pressurized gas for vibrating a chamber-sealing disk to emit a shrieking sound. The actuator is located adjacent to the tank and t... | 01/27/1981 |
| 4203089 | Electro-hydroacoustic transducer An underwater transducer which includes a fluid circuit having a valve disposed in a plenum chamber having a small aperture open to the ambient water pressure. Fluid flow into and out of the chamber by way of the valve is governed by controlling the valve... | 05/13/1980 |
| 4168493 | Alarm system for a multi-facet installation An alarm system for a multi-facet functional installation in which a malfunction in any segment of the installation will result in the initiation of an audio alarm signal of such a character as to immediately indicate the relative severity of the malfunct... | 09/18/1979 |
