Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 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 driver's seat and front passenger seat of the vehicle cabin, so that i... | 05/22/2012 |
| 7053586 | Brushless repulsion motor speed control system A system for controlling the speed of a brushless repulsion motor having a series of switches mounted on a rotating armature for shorting circumferentially spaced armature coils comprising first stationary signaling means and a plurality of rotating detectors for ac... | 05/30/2006 |
| 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 valve. The valve may control the flow of a fluid into a site... | 12/16/2003 |
| 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 generate an output signal as a function of an output volt... | 10/06/1998 |
| 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 solenoid in series with the power source and the resistor and in... | 05/05/1998 |
| 4881148 | Remote control system for door locks A remote control system which includes (a) a receiver unit adapted to be fixedly mounted on a motor vehicle having at least one door lock with a first locked condition and a second unlocked condition and having means for receiving a coded signal including... | 11/14/1989 |
| 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 radio transmitter is worn on a necklace. The compact acti... | 12/20/1988 |
| 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 sensing unit mounted on the test point a rectifier circui... | 02/03/1987 |
| 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 capacitance of the device remains substantially constant. Filte... | 01/13/1987 |
| 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 hold" control. The system permits the technician or operator... | 12/09/1986 |
| 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 capacitive receptor antenna by the action of the electric field.... | 07/30/1985 |
| 4449055 | Circuit breaker control device An energy-efficient device for managing residential loads on electrical generating systems is disclosed. The device is suitable for installation in existing circuit breaker load center panels at low labor costs, to be signalled from Load Management System... | 05/15/1984 |
| 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 circuits from broken heating elements, and short circuits... | 09/06/1983 |
| 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 portable transmitter unit adapted to be carried by the ins... | 03/29/1983 |
| 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 signaled variation in frequency is detected at a power consuming... | 01/25/1983 |
| 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 detector from the applied overload thereby allowing the de... | 04/06/1982 |
| 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 transistor ON during the mark portions of the modulator carrier s... | 02/02/1982 |
| 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 variation in frequency is detected at a power controlling... | 01/20/1981 |
| 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 receiver, and the subsequent reconnection thereof in timed se... | 11/18/1980 |
| 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 means for discriminating any voltages of sufficient magni... | 03/18/1980 |
| 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 ultrasonic sound receivers, each receiver controlling power for ... | 04/17/1979 |
| 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 alternately produces an output patented of one polarity a... | 10/03/1978 |
| 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 common, rails in parallel and returns through the common rail... | 09/26/1978 |
| 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 temperature, and generating pulses continuously while the fix... | 08/01/1978 |
| 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 represented by an electrical signal having a parameter which varie... | 11/01/1977 |
| 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 time the FM signal sweeps past the resonant frequency of one ... | 08/16/1977 |
| 4037141 | 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 a plurality of ultrasonic sound receivers, each receiver controlling power for a sepa... | 07/19/1977 |
| 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 an input of a bandpass filter which rejects all frequencie... | 03/08/1977 |
| 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 thereto. A power supply test is also included, as well as circu... | 02/01/1977 |
| 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 timing means responsive to an actuating signal from one of the ... | 11/16/1976 |
| 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 pass to leave a protected area and a magnetic marker assoc... | 09/28/1976 |
| 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 for measuring the detected subsynchronous current.... | 03/16/1976 |
