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8184430 Vehicle media system  
A vehicle media system for use in conjunction with a portable media device is set forth. The vehicle media system includes an input module that is mountable, for example, at a console between the...
7944673 Driving method of electromagnetic valve, electromagnetic valve driving unit and apparatus for coloring electric wire  
A coloring apparatus 1 includes a coloring nozzle 31 for spouting a coloring material, a signal generator 53, and a controller 19. The coloring nozzle 31 includes an electromagnetic valve 51. The...
7772722 Switching system and method for adjustment thereof  
A switching system. The switching system includes an optical component, an electromagnetic switch, an auxiliary adjustment structure, and a control circuit. The optical component reflects or...
7636051 Status monitor apparatus  
A statistical value update unit calculates the fluctuation of measurement data. A filtering processing unit extracts a normal white noise component from the fluctuation of the measurement data...
6662821 System and method for closing an existing valve in response to a detected leak  
The invention is system and method for detecting a leak and operating an existing valve in response to the detected leak. In this regard, a receiving unit may be installed on an existing shutoff...
5818129 Non-contact proximity switch and method for programming it  
In order to improve a non-contact proximity switch, and a method for programming it, with an resonant circuit that can be influenced by objects approaching from outside and an evaluation circuit to...
5748074 Electronic door chime  
A circuit for actuating a door chime has a dc power source in series with a resistor and in shunt with a capacitor. A remote push button transmits a radio signal to the circuit, to connect a...
4792798 Remote control system for pull-cords  
A remote control for pull-cord stations in hospitals, convalescent homes, and multi-unit housing for the elderly consists of a portable transmitter and an activator unit. The small, battery-powered...
4641220 Test point mounted voltage monitoring system  
A voltage monitoring system for mounting on a test point in an AC power distribution system provides an output when the voltage level on a conductor is above a predetermined minimum level. Within a...
4636913 Temperature compensated capacitor  
A temperature compensating capacitor device is described. The device incorporates at least two capacitors with different dielectric materials which vary with temperature such that the overall...
4628306 Remote control system for automated equipment  
A remote control system operates automated equipment, such as a robotic device. The remote control system operates using an RF link and has both a "hard stop" control and a "soft stop" or "cycle...
4532501 Capacitively coupled machine tool safety system  
A safety system for a machine tool is characterized by a capacitively coupled electric field generator (transmitter) and a capacitive receptor antenna. An electrical signal is induced in the...
4403267 Electrically heated vacuum furnace with a fault detection system  
An electrically heated vacuum furnace is described as having a fault detection system which has the ability to sense among other things, carbon arc buildup, a load touching a heating element, short...
4378507 Emergency power shutdown system for educational laboratory  
The emergency power shutdown system is especially adapted for use in an educational laboratory containing a plurality of items of potentially dangerous educational equipment. The system includes a...
4370563 Method of and apparatus for load and/or load control signaling to customers in a power system  
Information is conveyed from a transmitting site to a consuming location in an electric power system by varying the frequency of the power from the nominal standard generating frequency. The...
4323943 Protection circuits  
A protection circuit suitable for use with electronic test equipment contains a switch which is open circuited if an overload condition is detected. The opening of the switch isolates the overload...
4314306 Signal-powered receiver  
A self-powered receiver including a series resonant circuit tuned to the carrier frequency of a modulated carrier signal. A demodulator for detecting the envelope which switches a switching...
4246492 Method of and apparatus for load and/or load control signaling to customers in a power system  
Information is conveyed from a generating site to a consuming location in an electric power system by varying the frequency of the power from the nominal standard generating frequency. The signaled...
4234904 Process and device for the protection of electrical energy supply systems controlled by means of audio-frequency  
A process for the protection of electrical systems upon return of power after power interruptions, through the immediate disconnection of secondary consuming units by an audio-frequency control...
4194230 Hazardous voltage protection circuitry  
A safety circuit for protective operation at the interface between certain customer premises telephone installations and the external telephone distribution lines. The protection circuit includes a...
4150415 Energy conservation system  
An energy conservation system is disclosed wherein power in a given area, such as in a hotel or other room, is controlled by means of an ultrasonic sound transmitter and at least one or more...
4118750 Vital relay operating circuit  
There is disclosed a circuit for energizing a vital relay in response to an input signal that is modulated between two frequencies. A discriminator circuit responds to the modulated frequencies and...
4117529 Broken rail detecting track circuits  
Two sensor coils are positioned one adjacent each separate gage rail at the track relay end of a dual gage track section in which train detection current flows in the two gage, i.e., other than...
4104692 Device for detecting abnormal temperature in fixer  
A device for detecting an abnormal temperature in a fixer, including a pulse generation controller capable of detecting the temperature in the fixer, comparing it with a predetermined reference...
4056817 System for monitoring a periodic function  
A system for monitoring the frequency of a periodic function and indicating whether or not said function frequency differs from a predetermined frequency, with the function frequency being...
4042970 Dual frequency narrow-band frequency modulated keyable control circuit and keying circuit therefor  
A keyable control circuit generates a narrow-band FM signal. A keying circuit, containing two tuned circuits, placed next to the tank coil of the keyable control circuit, absorbs rf energy each...
RE29341 Locking apparatus  
An electronic control actuating system having signal transmitting or injector means and signal receiving means. The signal transmitting means includes a plurality of self-contained oscillator...
4011486 Tone operated switching arrangement  
Disclosed is a switching arrangement operable by a tone of a predetermined frequency. An automatic gain control amplifier has an input connectable to a source of signals and an output connected to...
4006309 Voice operated relay  
A voice operated relay system is disclosed which includes signal processing ircuitry for receiving and discriminating with respect to human speech signals and for actuating a relay in response...
3992656 Siren detector  
An audio range siren detector utilizes an audio pickup including an A.G.C. amplifier, a plurality of electronic active filters having closely spaced resonant frequencies such as 800, 825, 850...
3983552 Pilferage detection systems  
In a pilferage detection system employing apparatus for generating a magnetic field of alternating polarity and predetermined fundamental frequency through which articles subject to pilferage must...
3944846 Subsynchronous relay  
A relay for detecting sustained subsynchronous current on a power system. The relay includes a filter network for separating subsynchronous current from synchronous current and a detector network...
3873894 POWER SUPPLY CONTROL SYSTEM  
A circuit for manually and remotely controlling a power supply for an electric apparatus. A remotely controllable power switch is provided for the electric apparatus and is controlled by a relay...
3854683 DETECTOR TRACK CIRCUIT  
An alternating current source, normally supplying a basic frequency, is connected to the track section rails through a coupling transformer. In series with the source and transformer primary is a...
3828225 FAIL-SAFE VEHICLE-CARRIED ANTI-COLLISION PROTECTION RECEIVER  
This disclosure relates to a fail-safe vehicle-carried anti-collision receiver for automatically applying and releasing the service brakes to control the movement of a vehicle. The receiver...
3824430 CIRCUIT ARRANGEMENT FOR RECOGNITION OF A DEFECT CAUSED BY PHASE BREAKDOWN OR GROUND SHORT IN THE CURRENT SUPPLY OF A THREE-PHASE MOTOR  
A circuit arrangement for recognition of a defect from detection alternating voltages proportional to current values at the outer conductors of a three-phase motor and which defects are brought...
3819934 FAIL-SAFE SOLID STATE HIGHWAY CROSSING PROTECTION APPARATUS  
Solid state static relays, with contact circuits including insulated signal couplers formed by light emitting diodes and light responsive transistors, are used as track circuit detectors and...
3818241 LOAD CONTROLLING RECEIVER  
A load controlling receiver for controlling the application of power to a load in response to a control signal is disclosed. The load controlling receiver includes a remote control relay which...
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...
3787714 ELECTRONIC LOCK AND KEY SYSTEMS EMPLOYING PAIRED KEY AND MASTER CODING MODULES  
There is disclosed an electronic key and lock system for activating an electric latch when a valid key is inserted into a key receiving receptacle. The system is energized by the insertion of the...
3780360 SHAFT POSITIONING MEANS  
Means for sequentially positioning a shaft in different angular positions which enables slower operation than a stepping switch, eliminates the need for cam-operated holding contacts and operates...
3770981 VOICE CONTROLLED TARGET RELEASE SYSTEM  
Trap system in which the release of clay targets is controlled electronically in response to the shooter's verbal command. Means is included for distinguishing the shooter's commands from other...
3753073 SIGNAL INTERPRETING CIRCUIT  
A signal interpreting circuit for switching an output load in response to an increasing input frequency, the circuit having a frequency to direct current converter for providing a direct current...
3753003 SAFETY DEVICE AGAINST RADIATION LEAKAGE FROM MICROWAVE APPARATUS  
A safety device for microwave ovens is disclosed, which prevents radiation leakage from such an oven, the device being of the kind where a gas lamp is located in the area where radiation leakages...
3748533 DIGITAL TACHOMETER  
A digital tachometer which is compact, highly reliable, and economically implemented with conventional circuitry including in combination with transducer means for generating a pulsed signal, a...
3746939 RECEIVER FOR CENTRALIZED CONTROLLING APPARATUS  
A receiver for a centralized controlling apparatus is used for switching a load at a given remote location upon the receipt of a transmission of a specific frequency signal from a station through a...
3738460 HYDRAULIC RELEASED CLUTCH CONTROLLED BY ENGINE SPEED AND SHIFT SWITCHES  
Disclosed herein is an automatic control system of a friction disc clutch for vehicles, which comprises a source of fluid pressure, hydraulic servo means for disengaging the clutch, solenoid...
3732465 ELECTRONIC SENSING AND ACTUATOR SYSTEM  
An electronic sensing and actuator control system for sensing an energy change dependant on the proximity of a coded member to a sensor mechanism, the mechanism including an electric field...
3710336 SIGNAL-RESPONSIVE CONTROL SYSTEM  
An actuating system responsive to a predetermined frequency includes a network for preventing actuation by noise, unauthorized, or spurious signals, which network includes a filter which passes...
3703717 VOLTAGE/FREQUENCY RATIO MONITOR FOR A. C. SIGNALS  
A circuit for use with a signal generator to monitor the output signals, that provides an alarm indication if either voltage or frequency fall below or exceed predetermined limitations. Only...
Matches 1 - 50 out of 219 1 2 3 4 5 >