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| Number | Title | Issue Date |
| 4053876 | Alarm system for warning of unbalance or failure of one or more phases of a multi-phase high-current load An alarm system for warning of unbalance or failure of one or more phases of a multi-phase load circuit which is convenient and practical to use even where the load circuit is drawing a large current and where the flow of power to the load may be controll... | 10/11/1977 |
| 4052664 | Circuit monitor to determine power on and circuit working An assembly of components for monitoring an electrical circuit, and which truly indicates whether the circuit is working; the assembly including a voltage transformer in series with a minimum resistance load, a secondary winding of the transformer communi... | 10/04/1977 |
| 4045714 | Remote switch control and status indicator system A plurality of control stations spaced along conductor lines; a normally closed disconnect switch at each station for connecting or disconnecting said conductor lines; a fault detector at each station; a status indicator at each station to indicate the st... | 08/30/1977 |
| 4045726 | Tool for manually tripping a fault indicator for high voltage electric power circuits and resetting same This invention relates, generally, to fault indicators and it has particular relation to tools for testing fault indicators of the kind and character disclosed in my U.S. Pat. No. 3,906,477, issued Sept. 16, 1975.... | 08/30/1977 |
| 4041451 | Circuit for monitoring the operativeness of current-consuming electrical devices The monitoring circuit includes an indicator operative when activated for providing an indication. A control circuit is operative for activating the indicator when proper current ceases flowing in the current path of the monitored electrical device. The c... | 08/09/1977 |
| 4039932 | Fault indicator testing apparatus Apparatus provides for testing a fault indicator of the type which has a surge-current detection portion and a settable fault indicating portion and which is widely used in electric power distribution systems. Such a fault indicator must meet certain perf... | 08/02/1977 |
| 4037194 | Current sensing alarm circuit for a motor vehicle The alarm circuit is for detecting the theft of a vehicle and receives its power from the vehicle storage battery. The grounded battery cable is passed through a ferromagnetic toroid having one or more turns of wire wound thereon. An oscillator circuit co... | 07/19/1977 |
| 4037155 | Current-responsive threshold detection circuitry Threshold detection circuitry for providing an output current responsive to an input signal current, but only if it be of sufficient amplitude and persistence.... | 07/19/1977 |
| 4034360 | System for disabling the reset circuit of fault indicating means The reset circuit of a fault indicator is disabled to prevent automatic restoration of the movable target from fault indicating position where it can be observed and manually rest. A manually operable switch is connected across the reset ciruit and its co... | 07/05/1977 |
| 4027235 | Direct current compensation circuit with current threshold detection A circuit for use with a transformer having a plurality of windings monitors the direct current flow through a first winding and provides a corresponding compensation current to a second winding. The circuit also provides an output signal indicating wheth... | 05/31/1977 |
| 4010457 | Overload protection device A current overload protection device adapted for use in a system sequentially connecting a plurality of selected loads to a common source of excitation, said protection device opening the common circuit during those times when a shorted load is on the cir... | 03/01/1977 |
| 4007401 | Current sensitive circuit protection system An electrical control system which is utilized for opening a circuit breaker which is connected to a load to be protected. The control system comprises a unitary current sensor module which senses current flowing in the load to be protected. The sensor is... | 02/08/1977 |
| 4002951 | Electrical receptacle mounted ground fault interrupter with automatic plug insertion testing Electric receptacle apparatus having a ground fault detector and current interrupter. The apparatus may be mounted in the standard receptacle box used for housing a double socket outlet. The apparatus includes means for automatically testing the operation... | 01/11/1977 |
| 4001649 | Temperature monitoring of semiconductors A current sensor provides a voltage signal which is proportional to the average current flowing through a semiconductor device junction. This voltage signal is applied to a first analogue circuit which produces an output voltage indicative of the average ... | 01/04/1977 |
| 4001808 | Electronic device for monitoring power consumption of an electro-optical display An electronic device for use with a battery driven electro-optical display, wherein the device includes circuitry for detecting an increase in the rate of electric power consumption of the display, and generates a signal upon detecting the increase. The d... | 01/04/1977 |
| 4000462 | Fault indicator circuit Disclosed is the physical construction and electrical control circuit of a fault indicator designed to provide a watertight structure for the indicator. One face of the indicator is visible through the sealing apparatus, the sealing apparatus enclosing th... | 12/28/1976 |
| 3991366 | Means for indicating abnormal high current flow in a high voltage electric power distribution conductor and for resetting and testing same An indicator for flow of fault current in a conductor is enclosed in a housing carrying a metallic clamp for detachable mounting on the conductor. The indicator is operated by closure of a switch in response to flow of fault current in the conductor and i... | 11/09/1976 |
| 3988649 | Signal amplitude monitor and relay driver circuit A signal amplitude monitor and relay driver circuit. The input signal is applied to a plurality of diodes connected in series with a set of normally closed relay contacts and a first resistor. A second resistor is connected in parallel with the series con... | 10/26/1976 |
| 3986166 | Anti-tamper automobile alarm system utilizing plural reed type switches An alarm system for automobiles, which is actuated when an unauthorized person tampers with the automobile. An inductive coupling is made with the automobile electrical system so that a variation in current flow in the system activates the alarm. An actua... | 10/12/1976 |
| 3983554 | Electric power distribution system including a Master Annunicator and Central Control Unit An Electric Distribution system for hospital use includes a plurality of ungrounded remote Power Supplies. Each remote Power Supply is provided with a Line Isolation Monitor. A Master Annunciator and Central Control Unit is connected to the several Line I... | 09/28/1976 |
| 3981544 | Brake controller and short circuit probe disconnect A control for brakes in trailer vehicles comprising a circuit providing pulsed signals to the brakes. It is preferred that the time or width of each pulse is equal but the frequency of brake pulsing is increased in accord with inertially sensed stress. Th... | 09/21/1976 |
| 3974438 | Apparatus for indicating over-current condition in a transistor amplifier An auxiliary transistor has its base-emitter junction serially connected with the collector-to-emitter path of a clamping transistor used to starve a power amplifier transistor of input signal drive when an over-current condition is sensed. During the ove... | 08/10/1976 |
| 3974446 | Polyphase fault current flow detecting and resetting means Detection of fault current flow in any conductor of a polyphase alternating current system is provided by a fault responsive device that is reset only when normal current flows in each conductor. A reed relay is latched in operated condition on the occurr... | 08/10/1976 |
| 3973105 | Protective device for induction heating apparatus A protective device for an induction heating apparatus comprising: means for detecting a change of value and phase of a current passed to an excitor for induction-heating a heating element by generating an alternating magnetic field; and means for breakin... | 08/03/1976 |
| 3969710 | Apparatus for picking up signal currents flowing through signal lines In apparatus for picking up a pulse shaped signal current flowing through a signal line for operating a remotely located relay, a pickup coil is wound on a magnetic core linking the signal line and the voltage induced in the pickup coil is applied to a hi... | 07/13/1976 |
| 3967257 | Current monitor circuits A visual indicator in parallel with a zener diode, positioned in series with a load is provided to monitor the presence of current flow in a circuit over a range of several orders of magnitude. In addition, a circuit arrangement is described to monitor th... | 06/29/1976 |
| 3962694 | Method and apparatus for monitoring an electrically actuated tool A method and apparatus for monitoring an electrically actuated tool. The current flowing in the tool circuit is sampled and converted to an analog voltage signal that is proportional to the maximum stress level output of the tool. This converted signal ma... | 06/08/1976 |
| 3953682 | Loop current detector A loop current detector for detecting current flowing in a pair of telephone wires comprises: A. a saturable reactor having first, second and third windings, the first and second windings adapted to be connected in a loop circuit to pass DC current, B. re... | 04/27/1976 |
| 3943501 | Printing machine high voltage power system and circuit The high D.C. voltage power supply device for the electrodes of an electrostatic ink mist prevention system in rotary printing machines has a conventional full-wave voltage doubling circuit consisting basically of a transformer, plug-in rectifiers, plug-i... | 03/09/1976 |
| 3943409 | Monitor assembly for ground fault interrupter A monitor assembly comprising an indicator, such as a lamp, operable when a ground fault occurs in a protected circuit to show that the circuit has been interrupted. A separate power source is provided for the indicator circuit to keep the lamp lit throug... | 03/09/1976 |
| 3934940 | Safety interlock circuit for switching brake antilock systems in a tractor trailer vehicle combination in and out In the tractor vehicle a current measuring resistor is interposed in the line supplying current to a coupling connector terminal to which the antilock system of a trailer equipped with such a system is connected for its power supply. A resistor load is co... | 01/27/1976 |
| 3934239 | Adjustable electronic load-alarm relay This invention is an improved electronic alarm relay for monitoring the current drawn by an AC motor or other electrical load. The circuit is designed to measure the load with high accuracy and to have excellent alarm repeatability. Chattering and arcing ... | 01/20/1976 |
| 3932790 | Ground fault interrupter with reversed line polarity lamp indicator A ground fault interrupter (GFI) provided with a reversed line polarity lamp indicator to indicate proper installation of the GFI. The reversed line polarity lamp indicator includes a push button and a lamp connected in series between the line conductor o... | 01/13/1976 |
