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| Number | Title | Issue Date |
| 4876622 | Circuit breaker warning relay and control accessory A circuit breaker warning and control relay provides visual indication of an impending overcurrent condition. Sufficient time is thereby allotted for manual intervention to prevent damage to material and equipment utilized within sensitive manufacturing p... | 10/24/1989 |
| 4862142 | Circuit with memory for detecting intermittent changes in resistance, current, voltage, continuity, power interruption, light, and temperature Electrical circuits for detecting intermittent and continuous electrical parameters such as continuity for open or closed circuits, AC power interruption or decrease in frequency, DC power interruption, missing electrical pulses; and voltage, resistance, ... | 08/29/1989 |
| 4862287 | Power line monitor and printer system A dot line printer is releasably connected by a control circuit to the output of a monitor which senses variations or faults in the AC line voltage for a computer or the like. Each time the monitor senses any one of the five different voltage disturbances... | 08/29/1989 |
| 4855721 | Alarm apparatus for a freezer An alarm apparatus is provided for a freezer having a body and a closure member. The alarm apparatus has an electrical control unit having a power supply input. An alarm device and a temperature sensor are connected to the control unit. The temperature se... | 08/08/1989 |
| 4855722 | Alternating current power loss detector The duration of time during which an AC power voltage sinusoidal waveform remains between negative voltage threshold -V1 volts, nominally 5% of negative peak voltage -V2 volts, and positive voltage threshold +V1 volts, nominally 5% of peak positive voltag... | 08/08/1989 |
| 4839605 | Signal compensation circuits A detection system for a sliding lift or elevator door comprises at least two sensors for monitoring the door opening. The sensors are arranged to detect the presence of a moving irregular shape (e.g. human form) in the doorway to reverse the opening acti... | 06/13/1989 |
| 4839633 | Asymmetric voltage monitor for series supplies Disclosed is a supply voltage monitor for detecting the asymmetric decay of one voltage source (Vdd) with respect to another voltage source (Vss). The monitor circuit (24) includes a resistive voltage divider (26) having a plurality ... | 06/13/1989 |
| 4835513 | Method and apparatus for testing an airbag restraint system A test circuit for an airbag restraint system provides an accurate determination of the operativeness of a storage capacitor and calculates the resistance of inertia switch resistors. The test circuit provides for parallel testing of the storage capacitor... | 05/30/1989 |
| 4800368 | Pyroelectric detector arrangement An arrangement for detecting the passage of living beings into and out of a surveillance region includes optics which concentrate thermal radiation energy from the surveillance region into a detection zone where an active area of a pyroelectric detector i... | 01/24/1989 |
| 4797655 | Detector system for monitoring a fluid containing tube Apparatus for monitoring fluid flow in dialysis systems include a tube holder for mounting the tube at a predetermined location on a dialysis monitor, a transmitter for transmitting a signal such as ultraviolet light through that location, a receiver for ... | 01/10/1989 |
| 4785294 | Static monitoring system A static monitoring system for use with an electronic manufacturing work area, typically a conventional work bench having an electrical conducting strap for connecting the operator's wrist to earth ground, and including a circuit for indicating when there... | 11/15/1988 |
| 4764839 | Low voltage reset circuit A low voltage reset circuit includes a first transistor having a base connected to a voltage divider and an emitter connected to the junction of a resistor-diode arrangement such that when the supply voltage falls to a trigger voltage level, the transisto... | 08/16/1988 |
| 4761639 | Lightweight, compact detector of sudden changes in concentration of a gas Lightweight, compact apparatus for detecting sudden changes in the concentration of at least one selected gas provides a warning when said gas concentration increases suddenly. In one embodiment, a chemically sensitive field effect transistor provides a s... | 08/02/1988 |
| 4754407 | Digital phase synchronizer A method and apparatus for digital phase synchronization to an AC power line is disclosed, having an analog-to-digital conversion providing a digital phase error signal which is processed by an inverting proportional plus integral transfer function and co... | 06/28/1988 |
| 4745399 | Device for generating an alarm signal in the event of an environmental abnormality A device for generating an alarm signal in the event of an environmental abnormality has multiple sensors, with a multiplier associated with each sensor, an adder, and a comparator. The sensors are disposed in respective sensing volumes, which may be diff... | 05/17/1988 |
| 4736157 | Wide-range resistance monitoring apparatus and method An inexpensive circuit monitors the resistance between a body (e.g., a static dissipative work surface, a tool, etc.) and ground potential, and compares that resistance with high and low resistance values defining a preset resistance range. An operational... | 04/05/1988 |
| 4717997 | Abnormal condition detective circuit for a switching regulator This detective circuit detects an abnormal drop of an input voltage of a switching regulator of the flyback system. From the secondary winding of the switching regulator, a constant voltage controlled dc voltage is delivered through a diode. This circuit ... | 01/05/1988 |
| 4703259 | Forward and reflected power measurement and display A device for displaying forward and reflected power values simultaneously comprises a plurality of display segments which are switched on in a predetermined sequence to display the forward power and switched off in a predetermined sequence to display the ... | 10/27/1987 |
| 4697169 | Device for detecting and localizing a fault in an aerial rope-way transport installation A safety line 20 of an aerial ropeway transport installation 10 comprises in one of the stations a safety generating unit 22, which emits a square wave AC signal on the line. In the opposite station the line 20 is earthed by means of a diode 24. The safet... | 09/29/1987 |
| 4683464 | Safety monitor means and method A safety system and method, for use with apparatus having a conductive member where the apparatus changes the attitude and/or altitude of the conductive member during the operation of the apparatus, includes an antenna mounted on the conductive member whi... | 07/28/1987 |
| 4675664 | Alarm system and method for detecting proximity of an object to electrical power lines An antenna receives, by capacitive effect, a current of which the intensity is a function of the distance separating the antenna from an electrical power line. The other factors that influence the current are fixed, constant or are considered negligible. ... | 06/23/1987 |
| 4667186 | Phase difference fault detector Apparatus and method for monitoring a self-regulating heater comprising a PTC conductive polymer while it is being powered by a power supply signal. The apparatus is connected to a power supply and to the heater, the heater then producing a heater signal ... | 05/19/1987 |
| 4660027 | Reduced power consumption low battery alert device A reduced power consumption low battery indicator comprising in the preferred embodiment a transducer driver which drives a transducer to provide an audible alert. A microprocessor is used to generate a squarewave signal to power the transducer driver whe... | 04/21/1987 |
| 4654645 | Electric element breakdown detector An electric element breakdown detector includes an electric element (5: 5a: 106: 132: 172) connected in series with a switching element (6: 6a: 116: 116a: 171) which define a series connection. A processing circuit (40: 110: 174) produces a control signal... | 03/31/1987 |
| 4651084 | Fault test apparatus for conductors of multiconductor cable Two parallel chains of resistances of like value are coupled between a pair of terminals to which a test voltage is applied. One chain is formed by connecting each cable conductor between a different pair of resistances in alternating serial fashion. A pl... | 03/17/1987 |
| 4638304 | Environmental abnormality detecting apparatus An environmental abnormality detecting apparatus for detecting abnormality in atmosphere such as heat, smoke, and a gas. A sampling circuit is provided for periodically sampling analog signals from a detector for detecting these phenomena. A quantizer qua... | 01/20/1987 |
| 4634971 | Portable hand-held voltage sensor with manually adjustable reference voltage for comparison with sensed voltage A hand held voltage sensor in which a low impedance test lamp mode or a high impedance voltage test mode is selectable via a thumb accessed slide switch. In the high impedance mode, three light emitting elements provide indication of the value of voltage ... | 01/06/1987 |
| 4628303 | Visual monitor for electrical signals A circuit for monitoring the status of electrical signals, such as those present on the control and data lines of an RS-232 interface, includes a single operational amplifier and a dual-color LED indicator. The electrical characteristics of the LED's form... | 12/09/1986 |
| 4626831 | Analog signal processing circuit An analog signal processing circuit including both an analog signal multiplexer and a ranging circuit in cascade therewith is adapted for use in an integrated circuit. The multiplexer has a plurality of input current paths and an output current path. It r... | 12/02/1986 |
| 4575711 | Alarm terminal device An alarm terminal device has a lower limit voltage generator for generating as a lower limit voltage an analog signal which is produced from a temperature sensor and which is lower than a first predetermined value, and an upper limit voltage generator for... | 03/11/1986 |
| 4574276 | Indicating system An indicating system includes first and second voltage comparators, first and second output circuits which are respectively supplied with output signals of the first and second voltage comparators, and first and second indicating elements which are connec... | 03/04/1986 |
| 4563641 | Radiation upset threshold detector apparatus Described herein is a radiation upset threshold detector apparatus for measuring the output from a circuit that is operating in a radiation environment to determine when the radiation upset threshold is exceeded for the circuit.... | 01/07/1986 |
| 4559497 | Ranged voltage monitor with out-of-range enunciators A ranged precision voltage monitor with out-of-range enunciator characterized by a power supply and reference voltage stage, a voltage sensing stage, and an enunciator stage. The power supply stage provides power for the monitor, and further provides a re... | 12/17/1985 |
| 4558310 | Current sensing device and monitor A system senses alternating current in a conductor, such as a main line supplying electrical power to a home, and responds to the sensed current as by providing a warning signal when the sensed current exceeds or is less than a preset value for a predeter... | 12/10/1985 |
| 4558275 | Line voltage monitor system The Detector Module derives a synchronization signal from the half-wave crossovers of the AC power line. A half-wave peak detector detects the peak voltage of each half wave. An impulse detector detects the voltage of any impulses occurring during a half-... | 12/10/1985 |
| 4543565 | Method and apparatus for monitoring an alarm system A method and apparatus for monitoring an alarm system such as a fire alarm system having a plurality of alarms connected to a central station determine the amount of departure of measured alarm values from a rated quiescent value and calculate a fluctuati... | 09/24/1985 |
| 4543567 | Method for controlling output of alarm information In a method for controlling output of alarm information in a system for monitoring a plant wherein process variables including analog type process variables at respective sensing points in the plant are sampled and each of the sampled analog type process ... | 09/24/1985 |
| 4543570 | Detecting a rapid change of a critical physical condition Instead of monitoring a thermal deburring operation by reference to whether a certain high temperature is reached and thereby indicting whether a successful ignition in the deburring chamber has taken place at every step of operation of the chamber, a cir... | 09/24/1985 |
| 4524317 | Precision, dynamic low voltage measurement system A voltage divider used to supply multiple reference voltages is energized electrically, in shunt, by a constant voltage generator and, in series, by a constant current generator. The magnitude of current supplied by the constant current generator determin... | 06/18/1985 |
| 4523143 | Digital logic level comparator particularly for digital test systems A digital comparator for determining whether a digital test signal qualifies as an expected logic level, particularly suited to in-circuit digital testing applications. First and second comparing circuits, each formed by a differential amplifier circuit, ... | 06/11/1985 |
