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Document Title |
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7498934 |
Power supply and useful data exchange between a fire alarm control unit and a current sink
A method, system and circuit arrangement exchange data and supply power to at least one current sink connected via at least one data line pair to a fire alarm control unit. A pulsed voltage is used...
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7429929 |
Safety device
A safety device includes a safety module ( 11 ), a data bus ( 12 ) and one or several transmitters ( 15, 16, 17, 18, 19, 20 ). The safety module transmits a pulse train (one dynamic signal) over...
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7418036 |
Method and circuit for timing pulse generation
In a method and a circuit for timing pulse generation, a frame pulse of a corresponding system is masked when an alarm signal of either a working system or a protection system is received, a...
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7085130 |
Electronic device and button structure
A button structure is disposed on a housing and the housing has at least one opening. The button structure includes at least one button portion and a supporting frame. The button portion has a...
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6919802 |
Multi-layer method of accommodating code collisions from multiple surface acoustic wave identification tags
A method of accommodating code collisions from multiple SAW identification tag coded response pulses. In one embodiment, the method includes: (1) separating probable candidates by time-domain; (2)...
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6791276 |
Gradually lighting/dimming wireless transmission indicator lamp
Gradually lighting/dimming wireless transmission indicator lamp used in a wireless data transmission apparatus. The wireless transmission indicator lamp includes at least one light emitting diode,...
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6704787 |
Date of birth authentication system and method using demographic and/or geographic data supplied by a subscriber that is verified by a third party
A system or method for an access code issuer to receive an on-line application including certain personal information from a user of a computer network such as the Internet, to independently...
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6614347 |
Apparatus and method for providing alarm synchronization among multiple alarm devices
A method and apparatus for synchronizing a series of interconnected alarm devices. The alarm device detecting an alarm condition produces a signal having a distinct rising edge which is detected at...
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6577232 |
Monopolar, synchronized communication system
A communication protocol facilitates transmission at maximum rates for various types of cables. The protocol can be used to transmit information between a common control unit and a plurality of...
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6498563 |
Synchronized communication system
A communication protocol facilitates transmission at maximum rates for various types of cables. Signal to noise characteristics are improved by using voltage waveforms. The protocol can be used to...
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6384723 |
Digital communication system and method
A communication protocol facilitates transmission at maximum rates for various types of cables. Signal to noise characteristics are improved by using voltage waveforms. The protocol can be used to...
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6259363 |
Detector removal signalling device
A signalling device applies a pulsating signal to supply lines when a head is removed from a base. A monitoring system includes a plurality of such signalling devices and is responsive to the...
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6191689 |
Detection device
The present invention relates to a detection device comprising means (3) able to measure the value of a parameter, said device (1) being able to deliver values lying within a first measurement...
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6163263 |
Circuitry for electrical device in multi-device communications system
A self-monitoring power supply can be incorporated into electrical devices which are part of a multi-device communication system. The power supply is energized by electrical energy received from a...
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6121874 |
Multi-station dangerous condition alarm system incorporating alarm and chirp origination feature
In a dangerous condition sensing alarm system which includes a plurality of interconnected dangerous condition sensing units, such as smoke detectors, of the general type in which each unit...
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5850178 |
Alarm system having synchronizing pulse generator and synchronizing pulse missing detector
A pulse detection circuit to be used in combination with a generator of a train of synchronizing pulses. The detection circuitry remains in a first, inactive state in the presence of an ongoing...
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5844481 |
Intrusion detector for security systems
An intrusion detector for security systems includes a stationary host unit and a transponder unit secured to a movable door, window or the like. The host unit is secured to a stationary frame in...
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5793293 |
Temperature sensing system for over-heat detection
A temperature sensing system for over-heat detection includes a temperature sensing cable, interface unit and termination unit. The interface unit is configured to issue interrogation,...
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5708414 |
Sensitivity fault indication technique implemented in smoke detector system with self-diagnostic capabilities
Self-contained smoke detector systems each have internal self-diagnostic capabilities and function as components of an automatic fire alarm communication system implemented with a conventional...
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5689263 |
Antipilferage markers
An antipilferage tag is disclosed which includes a resonant circuit adapted to receive an RF signal and to transmit a response signal when interrogated by said RF signal. The tag includes circuit...
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5668531 |
Synchronized alarm holding system
In a system where the same alarm is held and displayed in different apparatuses, alarm information held in either an alarm detection apparatus or an alarm processing apparatus for a predetermined...
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5598139 |
Fire detecting system with synchronized strobe lights
An alarm system for producing substantially synchronized visual output indicia of the alarm condition includes a common source of pulses which is activated in response to the presence of the alarm...
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5574385 |
Testable solid state switch and related method
A switch module for connection between a power source and a controlled load, and a method for its operation, the switch module being testable without regard to the nature of the load, the nature of...
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5525962 |
Communication system and method
A communication system includes a control element, a bidirectional communications link, and one or more devices coupled to the link. The control element, via driver circuits, reversibly applies a...
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5402101 |
Method for determining the configuration of detectors of a danger alarm system and for determining the system configuration of suitable detectors
A danger alarm system includes a plurality of detectors, each of which having a microprocessor, a current drain controllable by the microprocessor for data exchange with a central station, an...
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5153583 |
Transponder
A portable passive transponder utilizes a single inductive coil transmission and reception system along with a single component rectifying means that is integratable on a single chip. The single...
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5029290 |
Emergency alert system
An alarm system suitable for use in a telecommunications network in which a central switching system is capable of selectively providing a signal of a predetermined polarity to a plurality of...
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5025470 |
Automatic meter reading system with malfunction protection
An output metering pulse signal is developed by measuring impedances at input terminals which are connected through lead wires to a metering unit shifted between low impedance and high impedance...
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4973943 |
Signal control system using two synchronous ring counter circuits
A signal control system for transmission circuits which includes two ring counter type transmission circuits respectively formed of a plurality of transmitter-receivers located opposite to each...
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4853685 |
Switch monitoring arrangement with remote adjustment capability having debounce circuitry for accurate state determination
An independent transmitter/receiver, or a transponder in a communication system, receives signals distorted by outside, unwanted conditions such as noise, line capacitance, and so forth. The status...
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4849734 |
Self-diagnostic circuit for alarm-systems
A self-diagnostic circuit for use in alarm systems and the like, of the kind having a plurality of alarm detection switches connected in a loop, indicators associated with each of the switches for...
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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...
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4733224 |
Detector system with multiple sensors each sensing different danger conditions
A detector system having multiple sensors, each sensor detecting a different danger condition, has an address comparator for determining whether an access address coincident with a selected address...
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4718622 |
Train fault monitoring system
This invention relates to a system for monitoring faults in various functions of rail road cars from the lead car or from the locomotive of a train. This system scans the train once for one...
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4713652 |
Electrical apparatus
An electrical apparatus for monitoring electrical continuity includes a number of input circuits each associated with a respective arm of a multi-phase rectifier circuit the continuity of which is...
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4646065 |
Fault-tolerant control system
A fault tolerant control system employing input sensing network and in association therewith a signal processing system which eliminates the effect of radiofrequency interference, electromagnetic...
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4625198 |
Alarm system diagnostic apparatus
A diagnostic status indicating apparatus is used with an alarm system having a plurality of normally-closed switch contacts which are opened upon occurrence of an alarm condition. Light-emitting...
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4622541 |
Intrusion detection system
There is disclosed an intrusion detection system employing vibration sensors which are arranged in a series loop consisting of first and second wires and which loop is terminated by a terminating...
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4618853 |
Fire detector
A fire detector which outputs a change in physical phenomena caused by fire, such as a change in smoke density, in the form of analog voltage signal, by, for example, a photoelectric type sensor,...
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4578669 |
Remote switch position indicator
A remote sensing and indicating system for monitoring and displaying at a central operating location the state or position of a remotely located multiple state element. The multiple state element...
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4563672 |
Microprocessor automatic program fail reset circuit
In a microprocessor controlled fire alarm system, a chain of continuous pulses is generated by the microprocessor. The chain of continuous pulses is monitored, and if there is an interruption in...
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4543566 |
Electronic monitoring system with malfunction indicator
A contactless motion detector responsive to the approach of a ferromagnetic element, including an oscillator with a sensing coil, has an output lead connected to one input of a first Exclusive-OR...
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4538137 |
Fire detector
In a fire detector that includes a sensor for producing an output voltage corresponding to smoke concentration, temperature, etc., there is provided a charge-and-discharge circuit to be reset by...
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4498074 |
Selectively testable fire detector
A selectively testable fire detector comprises a fire detecting circuit supplied with a first voltage and which detects smoke and/or temperature, a self-holding circuit which is actuated by the...
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4481502 |
Central smoke alarm and annunciator
A central smoke detection system for a building having multiple rooms utilizes low cost commercial smoke detectors in each room. Each detector includes a steady high current alarm mode, a low...
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4468664 |
Non-home run zoning system
Zone indication is provided for a facility monitoring and control system by providing the system's sensors and control unit with counters which are simultaneously incremented with clock pulses...
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4465998 |
Burglar-proof barrier
Burglar-proof barrier providing protection against intrusions, comprising means for the transmission of signals modulated and coded by pulses in a predetermined code, means for the reception of the...
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4435700 |
Event detection and indication system
The detection of events such as illegal entry detection, or the occurrence of predetermined hazards are detectable by a system including a circuit loop 2 which incorporates event actuatable...
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4435698 |
Circuit arrangement for the transmission of measurements to a central, especially in a fire alarm system
Several arrangement in which several measurement sources (fire alarms) are connected in parallel to a two-wire line. The supply voltage for the measurement sources is simultaneously fed through...
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4357601 |
Tamper protection for an automatic remote meter reading unit
In an automatic remote meter reading system, a tamper protection circuit (101) provides an alarm signal at a central station upon the disconnecting or tampering with a remote utility meter (100)....
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