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7081827 Power over Ethernet-prioritized active splitter  
A POE (power over Ethernet)-prioritized active splitter is disclosed for a prioritized network having different priorities such as a network security system that uses an intelligent POE power...
6462653 System and method of group definition  
An event detection system has a control element coupled to a plurality of detectors, such as smoke detectors. The control element can be implemented with a programmed processor. The detectors can...
6462651 Gear indicator  
A gear indicator provides a display to a motorcycle driver of which gear the motorcycle is currently operating in. The gear indicator is used with a gear position switch providing ground signal...
6392552 Weak cooling/overcooling compensation device for refrigerator  
The device for compensating a weak cooling/overcooling for a cooling chamber of a refrigerator has a plurality of resistances connected in series between the power and ground and a plurality of...
6229439 System and method of filtering  
An ambient condition detector includes at least a sensor for a first ambient condition and a second, sensor which is responsive to a second ambient condition not necessarily correlated to the first...
5999094 Combination telephone and smoke alarm system  
An in-building telephone distribution system has a multi-conductor telephone distribution cable, starting at the point where the telephone utility lines enter the building and extending from there...
5998985 Voltage indicator using serial comparison voltage measurement  
A voltage indicator using a serial or sequential comparison voltage measurement technique. Reference voltages generated by a voltage divider are applied to inputs of a multiplexer which is driven...
5912618 System for detecting the presence of an electrically conductive object, particularly an integrated circuit on a chip card  
The invention provides a system for detecting the presence of an electrically conductive object, the system comprising a first and a second contact (C1 and C2) intended to be short-circuited by...
5896086 Failure diagnostic apparatus  
When one of the failure detecting devices disposed at some spots in an electronic appliance detects failure of the electronic appliance, the failure detecting device detecting the failure generates...
5517175 Potential adjusting sensor supervision circuit  
A warning or alarm sensor supervision circuit employs varying voltage levels which may vary at random intervals and to random levels.
5438474 Protective sheath  
There is disclosed a tubular protective sheath for containing a power transmission conduit, the sheath comprising: first and second flexible elements each helically arranged to form respective...
5218339 Arrangement for monitoring a consumer in combination with an internal combustion engine and/or a motor vehicle  
An arrangement monitors a consumer in combination with an internal combustion engine or motor vehicle especially for monitoring an electric drive which is driven by an output stage in the form of a...
5168262 Fire alarm system  
A fire alarm system employs a neural network for obtaining one or more types of fire related information values. A plurality of detection information values are time-serially collected from plural...
5117219 Smoke and fire detection system communication  
A smoke and fire detection system wherein a central controller transmits data to remote transponders on a voltage supply line by pulse code modulation (PCM) of the supply voltage, and the...
4859989 Security system and signal carrying member thereof  
A security system comprising a signal-carrying member and a detector for detecting a change in the resistance of the conductive path surrounding a core of the signal-carrying member. The conductive...
4833451 Individual source identification  
An individual source identification of several signal providers or pick-ups with closable contacts disposed in a twin-wire signal line, in particular for fire detectors in fire alarm systems. The...
4831361 Environmental abnormality alarm apparatus  
An environmental abnormality alarm apparatus includes a sensor for detecting a fire, gas leakage, a burglar, or the like in a monitoring area, and a signal processor for receiving an output from...
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...
4742334 Single-wire loop alarm system  
A single-wire loop alarm system in which the status of each alarm switch can be determined and which is relatively immune to the effects of noise. False alarms are avoided by incorporating an...
4725821 Device for generating an alarm signal  
A device for generating an alarm signal in the event of an abnormality in the environment of a detector includes a pair of signal/power supply lines, a number of detectors for detecting an...
4706271 Communication lines with terminate and leave capability-DC alarm bridge  
Apparatus for connecting in series a plurality of communication line pairs, typically direct connected security loops used by alarm companies for monitoring customer's facilities. A bridge with...
4684931 Capacitive sensing security system  
Separate signal input circuits respond to intruder disturbances of a capacitive wire sensing grid to generate signal outputs processed to reject signals caused by environmental phenomena with a...
4665384 Signal-transmitting junction unit of hazard alarm system  
A signal transmitting junction unit for a hazard alarm system includes a signal transmission control unit, a zone line circuit connected to an electric source and having at least one hazard sensor...
4651138 Intruder alarm system  
An intruder alarm system includes a number of sensors each of which comprises first and second series-connected resistances and a sensor switch connected in parallel with the first resistance. The...
4647913 Self-diagnostic ultrasonic intrusion detection system  
A self-diagnostic ultrasonic motion detection system includes an ultrasonic transceiver operative in a transmit mode and in a receive mode. In normal operation, the ultrasonic transceiver in its...
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...
4567471 Monitoring system  
A monitoring system for a protection loop that has a plurality of switches in series utilizes modules with inexpensive diodes and resistors, and is conveniently and easily added to existing burglar...
4529970 Supervision system for monitoring the integrity of a transmission line  
The integrity of a two-conductor transmission line, over which d-c energizing voltage is supplied to a series of shunt-connected detectors (such as fire and/or smoke detectors) and which line is...
4524349 Security system having detector sensing and identification  
A security system including a plurality of sensor loops, each having a plurality of detectors and associated detector identification devices which upon actuation produce analog detector signals of...
4523183 Alarm-fault detecting system  
A microcomputer controlled circuit arrangement for sensing fire and burglar alarms in the presence of undesired fault conditions, such as opens or shorts, on monitored communication lines. The...
4506253 Supervisory and control circuit for alarm system  
An alarm detection, indication and supervision circuit with reduced power drain during failure of commerical power supply whereby standby batteries may maintain detection capability for an extended...
4506254 Alarm system with detectors and signaling devices on the same cable pair  
A single zone system which may use a single cable pair for both detectors of nonstandard conditions and audio/visual alarms. The audio/visual alarms are polarity responsive and in response to an...
4494106 Pressure monitor  
A tire pressure monitor which includes a signal generating section and a signal processing section. The signal generating section has a transducer which produces a first signal which is dependent...
4459582 Local control apparatus for central station alarm system  
In a central station alarm system the alarm sensors associated with a particular subscriber's premises are monitored by a local control unit associated with those premises and controllable by the...
4458239 Fire extinguishing apparatus  
A fire extinguishing apparatus and an actuating system. The actuating system includes a plurality of actuators connected in parallel and a source of electrical signal for said actuators. Each...
4441100 Electrical circuits  
A security installation has four, for example, normally-closed sensor switches which open in the presence of an intruder. Each switch is in series with a respective resistor and these series...
4420745 Security system  
A security system of the bridge circuit type has in one of its arms a conducting element whose impedance is to be monitored and in its other arms reference and/or compensating elements, for...
4414539 Built-in passive fault detection circuitry for an aircraft's electrical/electronic systems  
Built-in test equipment (BITE) of the electrical/electronic systems of an aircraft is provided in-part by passive fault detection circuitry that is integrated into the electrical/electronic systems...
4410882 System for monitoring the ignition function of rapid extinguishing systems  
In a fire sprinkler system a plurality of physically distributed actuators are connected in a normally balanced bridge circuit. The bridge circuit is impressed with a pulsed measuring voltage...
4369436 Anti-bridging cable supervision circuit  
In an intrusion alarm system, an anti-tamper system for detecting the bridging and removal of sensors connected in parallel along an interconnection cable includes means at each sensor for...
4356476 Multiple alarm detector monitoring and command system  
A plurality of fire, smoke, security or other detectors of the type which respond to the existence of a predetermined condition are each connected to an input module which monitors the state of the...
4356474 Alarm system  
A digital alarm system of the type having first and second electrically conductive loops connected by an alarm switch. The alarm switch is normally open, but can be closed when an alarm state...
4348661 Self-balancing alarm system  
An alarm system includes a security loop comprising a plurality of sensors, a circuit connected to the security loop and an alarm. The circuit is responsive to a change in condition within the...
4310835 Security equipment including trigger circuit  
Security equipment comprises a plurality of normally-open or normally-closed switch contacts connected in a loop circuit to a central control circuit. Each pair of switch contacts has a respective...
4287515 Fire detection system with multiple output signals  
A fire detection system includes a single conductor pair for both supplying the energizing voltage to all of the fire detectors in the protected area and receiving back status information regarding...
4274087 Annunciator monitor circuit  
A system for displaying the location of an open switch in a series alarm protection circuit containing a plurality of switches. A plurality of independent input monitoring circuits includes a...
4270123 Detector for indicating a fire or detector malfunction  
A fire detector provided with a warning system, a reference element and an analysis element whose impedance varies in the presence of a rise of temperature and/or radiation and/or combustion gas,...
4254396 Alarm circuit for car alternator  
An alarm circuit indicating a defect in a car alternator, said circuit comprising a voltage divider formed by two resistors connected between the positive terminal B+ and a negative terminal D- of...
4234873 Alarm installation with a number of self powered indicating elements  
An alarm system includes a number of self powered indicating elements each with an integral warning device. Each indicating element includes a control circuit which may comprise a transistor...
4218677 Detecting loop digital interface circuitry  
Digital interface circuitry is utilized to analyze the condition of alarm detecting loops. The new circuitry is utilized as an alarm system of the type which has a detecting loop extending between...
Matches 1 - 50 out of 91 1 2 >