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Match Document Document Title
8717184 Calibration of an electro-optical signal path of a sensor device by online signal level monitoring  
A sensor device detects an object, in particular for optically detecting smoke particles. The sensor device contains a transmitting device for emitting transmit radiation, a receiving device for...
8330095 Safety photoelectric switch  
There is provided an optical scanning type photoelectric switch capable of preventing interference with another photoelectric switch by use of its own capability, wherein, as for light projection...
8106763 Sensor system and method for sequential transmission of data  
A sensor has a transmitter module for transferring data via a line, the sensor receiving power via the line. At a point in time in which the sensor receives a first power level, it transmits the...
7990260 Electric device and method of normality determination for communication function in such an electric device  
A normality determination unit determines that a communication function for an outdoor unit of its own is normal when receiving a signal from one of indoor units, and writes a normality flag into...
7808395 Occupancy detecting method and system  
A method of and a system for detecting a person occupying a vehicle seat or a corresponding underlay whereby the underlay is provided with a single dynamic sensor and whereby the measurement...
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...
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 the bus...
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...
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...
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)...
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,...
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...
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...
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...
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...
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...
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...
6194994 Apparatus and method for synchronizing visual/audible alarm units in an alarm system  
An apparatus and concomitant method of reducing the number of synchronization pulses transmitted to the alarm units for increasing the reliability of the overall alarm system is disclosed. The...
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...
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...
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...
5933078 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...
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...
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...
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,...
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...
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...
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...
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...
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...
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...
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...
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...
5034966 Redundant and fault tolerant communication link  
A multiplexor system includes a transmitter (11) and receiver (13) with a communication link (12) interconnecting therebetween. One embodiment includes at least two communication links (12)...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...

Matches 1 - 50 out of 123 1 2 3 >