Quotables
"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 4031513 | RF data exchange system An improved remote meter reading system is disclosed comprising apparatus for transmitting UHF AM interrogating signals from an interrogating mobile or central station to a remote transponder station, and apparatus for retransmitting UHF FM data signals f... | 06/21/1977 |
| 4025922 | Traffic control system A traffic control system particularly suitable for aiding the blind includes an interrogating FM radio transmitter-receiving unit, which can be incorporated into a cane or the like, and a responding FM radio receiver-transmitter unit operatively associate... | 05/24/1977 |
| 4012696 | Multiple rate digital command detection system with range clean-up capability A multi-rate digital command system is disclosed which uses the composite signal of a μ-type ranging system as a subcarrier to transmit range codes and data from a station to a receiver where the range codes are sequentially phase modulated on a subcarri... | 03/15/1977 |
| 3982243 | Device for transmission of information from an information emitter to an information seeker A device for automatic transmission of information includes an information emitter and an information seeker wherein the information is transmitted from the emitter to the seeker in response to an interrogating signal from the information seeker. The emit... | 09/21/1976 |
| 3947807 | Vehicle location systems A vehicle location system for vehicles travelling over a predetermined route in which the vehicle sends to a base station information concerning the distance travelled from a predetermined starting point and the turns made, from which information the base... | 03/30/1976 |
| 3944928 | Harmonic communication system A communication system comprising a transmitter for radiating a carrier frequency signal, which may be modulated, to a data station. The station includes a rectifier for rectifying the received carrier signal to provide energy to the station elements. A d... | 03/16/1976 |
