US3569969A — Magnetic induction, audiofrequency selective, rem…

Claim 1

Independent Claim 690 words

A remote control system for models comprising an audiofrequency induction loop generated magnetic induction wave transmitting transmitter including a transmitter power supply, an audiofrequency oscillator including an oscillator transistor having emitter, base and collector elements, an emitter resistor connected between one side of the power supply and the oscillator transistor emitter, a transmitter voltage divider network connected between the opposite sides of the transmitter power supply, a feedback coil connected between the base of the oscillator transistor and a point on the transmitter voltage divider network and a resistance and tuned circuit operably associated with the tuned circuit connected in series between the collector of the oscillator transistor and a second point on the transmitter voltage divider network, a first transmitter amplifier including an amplifier transistor having emitter, base and collector electrodes, means connecting the collector electrode of the amplifier transistor to the one side of the transmitter power supply, means connecting the base of the amplifier transistor to the tuned circuit and a resistor connected between the one side of the transmitter power supply and the emitter of the amplifier transistor whereby the amplifier transistor is connected in emitter follower configuration, and a second amplifier transistor having emitter, base and collector electrodes, means for connecting the collector electrode of the second amplifier transistor to the other side of the power supply, means for connecting the base of the second amplifier transistor to the emitter of the first amplifier transistor and a magnetic induction loop antenna encompassing the area in which the model is to be controlled connected in series between the emitter of the second amplifier transistor and the one side of the transmitter power supply, an audiofrequency induction wave receiving receiver primarily magnetic induction coupled to said transmitter mounted in the model including a frequency selective magnetic pickup circuit tuned to the same audiofrequency as the transmitter transmits and comprising a coil having a permeable core and a capacitor connected in parallel, a reciever power supply, a series receiver amplifier for receiving the signal from the pickup circuit and amplifying it including emitter, base and collector electrodes, a collector resistor connected in series between one side of the reciever power supply and the collector electrode of the receiver amplifier transistor, an emitter resistor connected between the emitter of the receiver amplifier transistor and the other side of the receiver power supply, a voltage divider connected between the opposite sides of the power supply, means connecting the base of the receiver amplifier transistor to one side of the pickup circuit, a capacitor connecting the emitter of the receiver amplifier to a point on the receiver voltage divider and means connecting the other side of the pickup circuit to the same point on the receiVer voltage divider, a second amplifier including a transistor having emitter, base and collector electrodes, a transformer primarily winding connected in series between the collector electrode of the second amplifier and the one side of the power supply, a resistor connected to the one side of the rectifier power supply and the second amplifier base, a capacitor connected between the collector of the receiver amplifier and the second amplifier base, and means connecting the emitter of the second amplifier to the other side of the power supply and a reciever power amplifier rectifier including a transistor having emitter, base and collector electrodes, means connecting the base electrode of the amplifier rectifier through the secondary winding of the transformer to the other side of the receiver power supply, means connecting the emitter of the receiver power amplifier to the other side of the receiver power supply, a capacitor connected between the collector of the receiver power amplifier and the other side of the receiver power supply, a relay coil connected between the receiver power supply and the amplifier rectifier collector and means connected to the receiver for controlling the model in response to the magnetic induction wave transmitted by the transmitter to the receiver including a reversible motor, a power source for energizing said motor and means for energizing the steering motor in accordance with the energy through the relay coil of the receiver amplifier rectifier circuit.

Claim 2

Dependent Claim 690 words

A remote control system for models comprising an audiofrequency induction loop generated magnetic induction wave transmitting transmitter including a transmitter power supply, an audiofrequency oscillator including an oscillator transistor having emitter, base and collector elements, an emitter resistor connected between one side of the power supply and the oscillator transistor emitter, a transmitter voltage divider network connected between the opposite sides of the transmitter power supply, a feedback coil connected between the base of the oscillator transistor and a point on the transmitter voltage divider network and a resistance and tuned circuit operably associated with the tuned circuit connected in series between the collector of the oscillator transistor and a second point on the transmitter voltage divider network, a first transmitter amplifier including an amplifier transistor having emitter, base and collector electrodes, means connecting the collector electrode of the amplifier transistor to the one side of the transmitter power supply, means connecting the base of the amplifier transistor to the tuned circuit and a resistor connected between the one side of the transmitter power supply and the emitter of the amplifier transistor whereby the amplifier transistor is connected in emitter follower configuration, and a second amplifier transistor having emitter, base and collector electrodes, means for connecting the collector electrode of the second amplifier transistor to the other side of the power supply, means for connecting the base of the second amplifier transistor to the emitter of the first amplifier transistor and a magnetic induction loop antenna encompassing the area in which the model is to be controlled connected in series between the emitter of the second amplifier transistor and the one side of the transmitter power supply, an audiofrequency induction wave receiving receiver primarily magnetic induction coupled to said transmitter mounted in the model including a frequency selective magnetic pickup circuit tuned to the same audiofrequency as the transmitter transmits and comprising a coil having a permeable core and a capacitor connected in parallel, a reciever power supply, a series receiver amplifier for receiving the signal from the pickup circuit and amplifying it including emitter, base and collector electrodes, a collector resistor connected in series between one side of the reciever power supply and the collector electrode of the receiver amplifier transistor, an emitter resistor connected between the emitter of the receiver amplifier transistor and the other side of the receiver power supply, a voltage divider connected between the opposite sides of the power supply, means connecting the base of the receiver amplifier transistor to one side of the pickup circuit, a capacitor connecting the emitter of the receiver amplifier to a point on the receiver voltage divider and means connecting the other side of the pickup circuit to the same point on the receiVer voltage divider, a second amplifier including a transistor having emitter, base and collector electrodes, a transformer primarily winding connected in series between the collector electrode of the second amplifier and the one side of the power supply, a resistor connected to the one side of the rectifier power supply and the second amplifier base, a capacitor connected between the collector of the receiver amplifier and the second amplifier base, and means connecting the emitter of the second amplifier to the other side of the power supply and a reciever power amplifier rectifier including a transistor having emitter, base and collector electrodes, means connecting the base electrode of the amplifier rectifier through the secondary winding of the transformer to the other side of the receiver power supply, means connecting the emitter of the receiver power amplifier to the other side of the receiver power supply, a capacitor connected between the collector of the receiver power amplifier and the other side of the receiver power supply, a relay coil connected between the receiver power supply and the amplifier rectifier collector and means connected to the receiver for controlling the model in response to the magnetic induction wave transmitted by the transmitter to the receiver including a reversible motor, a power source for energizing said motor and means for energizing the steering motor in accordance with the energy through the relay coil of the receiver amplifier rectifier circuit.

Claim 3

Dependent Claim 71 words

Structure as set forth in claim 1 and further including means for energizing and deenergizing the magnetic induction loop antenna for pulsing the output of the transmitter comprising a free-running multivibrator connected across the transmitter power supply and including a relay having the coil as the load on one side thereof and a switching armature responsive to the coil in series with the emitter collector circuit of the receiver power amplifier.

Claim 4

Dependent Claim 81 words

Structure as set forth in claim 2 wherein the means connected to the receiver for controlling the model further includes an arm connected to the steering motor for rotation thereby, a steering wheel, a vertical pivot mounting the steering wheel on the model, means for moving the steering wheel about the vertical pivot in accordance with rotation of the arm by the steering motor and resilient means for urging the steering wheel to a central position about the pivot mounting therefor.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-03-08	1974-09-07	1975-03-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-03-08	1978-09-07	1979-03-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-03-08	1982-09-07	1983-03-09	$7700.00	Window Closed / Lapsed

Magnetic induction, audiofrequency selective, remote control system

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