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6142501 Recreational vehicle jack remote control  
The recreational vehicle jack remote control is for use with a recreational vehicle having a pair of support jacks which are raised and lowered by an electric motor connected to the jacks. The...
5978201 Design for solenoid driving circuit based on regulations of current ripple and solenoid effective time constant for driving keys of a player piano  
A solenoid driving circuit contains solenoids, each of which is driven to produce a magnetic field for driving each of keys of a player piano. A NPN transistor is provided to allow or block a flow...
5204609 Battery cooling apparatus  
An enclosure is arranged to receive batteries utilized subsequent to or prior to a radio controlled auto racing event, wherein the batteries are cooled to provide for accurate indication of...
3818369 VARIABLE INDUCTANCE SIGNAL CONTROL APPARATUS  
Signal control apparatus which includes a variable inductive element connected electrically in an oscillator circuit and physically mounted within a sealed housing having a resilient actuating...
3579240 SELECTIVE RADIO RECEIVER SYSTEM  
The disclosure shows a remotely controlled radio receiver circuit which may be used to control a garage door operator, for example, from a low-power remote transmitter. The signal emitted by the...
3501745 FREQUENCY SELECTIVE RESONANT REED DETECTOR  
3457463 METHOD AND APPARATUS FOR GENERATING ELECTRIC CURRENTS OF SMALL MAGNITUDE  
3350686 Resonant reed encoder-decoder, channel selector circuits therefor and communication circuits using the same  
3333272 Narrow bandwidth receiver with output equal to the voltage difference of a selected modulation frequency and all frequency voltages  
3302141 Alternating current sensitive relay  
3284673 Signal selector  
3271680 Dual modulated remote control system  
3270323 Control system for separate as well as simultaneous operation of remote working elements  
3213331 Frequency discriminator with vibrating magnetic mass  
3193706 Signal responsive load energization system  
3185901 Resonant reed adjusting means  
3177410 Time delay mercury plunger relay  
3161841 Automatic signal seeking tuner  
3153176 Resonant reed relay circuit with long activation time delay  
3142785 Control system  
3138745 Self-holding resonant reed relay  
3102214 Resonant reed relay  
3099755 Momentary electrical contact apparatus  
3098986 Band pass audio filter  
3093743 Resonant reed frequency sensitive control apparatus  
3047778 Wireless remote control system  
3040256 Selective signaling system with narrow band feedback  
3028582 Control system  
3001177 Superregenerative remote control receiver  
2991395 Speed responsive control device  
2984772 Ferroresonant inductor relay  
2957062 Frequency relay  
2954436 Receivers for frequency shift-keyed telegraph and similar signals  
2953726 Apparatus for producing a mechanical movement depending upon the oscillatory motion of a vibrating member  
2946054 Remote control radio system  
2919427 Predetermined code switching device  
2918548 Control device  
2900581 Mechanically resonant decoding apparatus  
2889536 Frequency responsive receiver for remote control system  
2871463 Method and apparatus for transmission of intelligence  
2858773 Frequency responsive control device  
2853677 Frequency-responsive relay and indicator  
2847572 Synchronized automatic frequency control system  
2835884 Telemetering system  
2831937 Vibratory reed device and system employing the same  
2828480 Train identification systems  
2817014 Syllabic frequency discriminator  
2811708 Selective calling system  
2799776 Control circuit for signal seeking receiver  
2799460 Remote control apparatus  
Matches 1 - 50 out of 149 1 2 3 >