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| Number | Title | Issue Date |
| 5172096 | Threshold determination apparatus and method A system and method for establishing an alarm threshold for each member of a plurality of detectors or sensors includes storing a value returned from each detector indicative of a clear air condition. A second value returned from each detector indicative ... | 12/15/1992 |
| 5170148 | Radiant energy testing device for fire detectors A testing device for fire detectors comprises a resistance heating coil disposed outwardly of a clear central area and a collar located to one side of and about the resistance heating element for locating of a fire detector relative to the heating element... | 12/08/1992 |
| 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 fire phenomenon detectors. The detection information value... | 12/01/1992 |
| 5164703 | Audio intrusion detection system A supervisory circuit for use with an audio intrusion detection system is disclosed. The supervisory circuit periodically generates an audio test signal which is supplied to a sounder which emits an audio test sound. The audio test sound is directed into ... | 11/17/1992 |
| 5159317 | System and method for remote telephonic station actuation A home communicator includes aid request circuitry capable of establishing communication with a central monitoring station in response to a first predetermined activation step performed by a subscriber and test circuitry capable of self-testing the home c... | 10/27/1992 |
| 5154504 | Communications and testing for emergency systems The present invention relates to emergency systems used in buildings, and particularly to emergency lighting systems whose function is to provide emergency illumination in the event of failure of primary (e.g. mains) power supply. As such systems must hav... | 10/13/1992 |
| 5153722 | Fire detection system A fire detection system includes a color video camera, a frame grabber and a computer processor operative to store and examine a series of image frames of the viewed area. Ultraviolet and infrared detectors produce event signals when energy received excee... | 10/06/1992 |
| 5151683 | Power supply control device in fire alarm system A power supply control device is provided in a fire alarm system having terminals such as fire detectors and/or repeaters with comparators to detect abnormalities such as fire or an operating status of controlled apparatus, and is equipped with a referenc... | 09/29/1992 |
| 5151682 | Fail-safe testing of an infrared sensor arrangement Device for fail-safe testing of a condition indicating device including at least one infrared sensor. The infrared sensor is connected by amplifiers to comparators which have different threshold values and have outputs connected to a microprocessor. An in... | 09/29/1992 |
| 5140306 | Alarm indicating system An alarm indicating system utilizing a plurality of remote sensors connected to a wired-OR address bus, the sensors having means for forming a binary address which is placed on the address bus as a series of high and low signal levels when the remote sens... | 08/18/1992 |
| 5136275 | Ground connection monitoring for airbag electrical igniter circuit Method and apparatus for periodically checking the ground path resistance value of a crash sensor connection to chassis ground and determining if the resistance exceeds a predetermined maximum acceptable value.... | 08/04/1992 |
| 5128962 | Line interface circuit and a method of testing such a circuit A line interface circuit sends two-level signals to a line and receives two-level signals from a line. The two levels of the signals are on opposite sides of a threshold range of levels. For testing the circuit the transmitter is connected to the receiver... | 07/07/1992 |
| 5128653 | Fire alarm system A fire alarm system in which an analog type sensor (3) is connected to a transmission line (2) from a receiver (1) and in which one or more on-off type sensor (7) located in the same monitor area (14, 15, 16) as that in which the analog type sensor (3) is... | 07/07/1992 |
| 5121101 | Apparatus and method for a smoke alarm device with integrated testing circuits Apparatus for providing integrated test circuits for a smoke detector is disclosed. The smoke detector operates such that products of combustion such as smoke and carbon monoxide cause the resistance across a sensor element to be lowered. The lowered resi... | 06/09/1992 |
| 5119069 | Apparatus and method for locating boundaries of detection zones covered by a passive infrared detection system An audio indicator apparatus for locating boundaries of optically divided detection zones covered by a passive infrared detection system having a collector for collecting infrared rays from the zones of an area to be monitored, and a detector for passivel... | 06/02/1992 |
| 5107446 | Environmental detection system useful for fire detection and suppression An environmental detection system particularly useful for fire detection and suppression is provided which ensures high reliability in operation and high reliability in preventing false operation. The preferred system includes a microprocessor-based, soft... | 04/21/1992 |
| 5105371 | Environmental detection system useful for fire detection and suppression An environmental detection system particularly useful for fire detection and suppression is provided which ensures high reliability in operation and high reliability in preventing false operation. The preferred system includes a microprocessor-based, soft... | 04/14/1992 |
| 5086293 | Line interruption supervisory device for a fire alarm system A line interruption supervisory device for a fire alarm system is capable of reliably carrying out the line supervision even if the line length is long and/or there is a large number of connected fire detectors. To this end, a terminating capacitor is con... | 02/04/1992 |
| 5045840 | Device for sensing continuity in a circuit having an open circuited apparatus The two wire device tests the continuity of conductors in a monitoring circuit having an open circuited apparatus. The device has a switch which is controlled by a sequencer and a clock. Upon the application of power, the device is energized if the contin... | 09/03/1991 |
| 5017905 | Fire alarm system In a fire alarm system including a plurality of addressable detectors connected to a main circuit extended from a central receiving unit, any alarming detector is discriminated and indicated in accordance with its address on the receiving unit side. In th... | 05/21/1991 |
| 4994788 | System for collecting alarms from a set of stations A system for collecting alarms from a set of stations includes a central station (SC) connected in series with the stations over a loop link includes a message loop (BM), a clock signal loop (BH), and a state control loop (BCE). Each station includes an i... | 02/19/1991 |
| 4988977 | Address setting means for fire detectors A fire detector assembly comprises a base (1) and a sensor (5) adapted to fit the base. The base (1) is provided with passive means, such as pins (6) or contacts arranged in a pattern to represent an address of the detector. When the sensor (5) is fitted ... | 01/29/1991 |
| 4970510 | Self test avionics equipment A self test avionics equipment is provided for use on an aircraft as part of a traffic collision avoidance system. The equipment has a radio frequency (RF) section and an integral test system. The RF section has an input/output unit, a transmitter and a r... | 11/13/1990 |
| 4965556 | Combustion products detector having self-actuated periodic testing signal Disclosed is an improved combustion products smoke alarm that includes an electronic circuit which automatically tests the detector's operation repetitively at periodic intervals, or periodically sounds the detector's alarm to remind the occupant to manua... | 10/23/1990 |
| 4962368 | Reliability and workability test apparatus for an environmental monitoring system An environmental monitoring system in which a controller is arranged to test the workability and reliability of a plurality of detector units on a cyclic basis. Each unit has an analog sensor and an analog to digital converter for converting the analog se... | 10/09/1990 |
| 4952913 | Tag for use with personnel monitoring system A tag for use with an individual monitoring system. The tag is worn by an individual being monitored, preferably on the ankle or leg where it can be concealed by the clothing of the individual. The tag is fully self contained and sealed. The circuits of t... | 08/28/1990 |
| 4923117 | Microcomputer-controlled system with redundant checking of sensor outputs A burner control system has a microprocessor for testing parameters of operation and for indicating deviations from a preset range for each. The sensors monitoring the parameters provide their outputs as analog voltages to analog to digital (A/D) converte... | 05/08/1990 |
| 4916432 | 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 transponders communicate with the controller by pulse width modulat... | 04/10/1990 |
| 4908602 | Apparatus and method of testing a portable held button for emergency response system An apparatus and method to test the internal functioning and operational limitations of a personal emergency response (PER) system. In the normal mode of operation of a PER system, a coded or uncoded activating signal transmitted by a portable help button... | 03/13/1990 |
| 4901061 | Instrumentation and monitoring systems employing differential temperature sensors Instrumentation and monitoring systems utilize, as differential temperature sensors, heated, split-well thermowells of duplex design, mounted to the sidewall of a pressure vessel and communicating through a penetration in the sidewall with the fluid state... | 02/13/1990 |
| 4901056 | Test initiation apparatus with continuous or pulse input A system for testing a remotely located sensing unit includes a photosensor located within the sensing unit. A control beam of incident electromagnetic energy can be provided from a remotely located portable source such as a flashlight. Directing the beam... | 02/13/1990 |
| 4893109 | Airbag electrical igniter readiness detector Method and apparatus for periodically checking the critical resistance value of an airbag igniter ("squib") component and determining if the resistance exceeds a predetermined maximum value.... | 01/09/1990 |
| 4885571 | Tag for use with personnel monitoring system A tag for use with an individual monitoring system. The tag is worn by an individual being monitored, preferably on the ankle or leg where it can be concealed by the clothing of the individual. The tag is fully self contained and sealed. The circuits of t... | 12/05/1989 |
| 4884060 | Multi-state selection switch for a personal emergency response system A multi-state selection switch for a personal emergency response system which permits selective operation of the system in HOME or AWAY modes. In the HOME mode, a subscriber unit located in a remote subscriber station is activated by a subscriber using ei... | 11/28/1989 |
| 4884059 | Apparatus and method for reporting verification testing of a personal emergency response system An apparatus and method for reporting verification testing of a portable activator is provided for a personal emergency response system. In normal operation of the system, a signal transmitted by the portable activator activates a subscriber unit in a rem... | 11/28/1989 |
| 4870394 | Smoke detector with improved testing A light scatter smoke detector includes an infrared light source and light sensor in a smoke chamber, the chamber including an adjustable screw which serves as a scatter reflector to provide an operating voltage used both in normal operation and for testi... | 09/26/1989 |
| 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 |
| 4859075 | Laser thermal testing method and system for use with a fire alarm system A laser thermal testing method and system for use in testing a fire alarm system which has a plurality of heat-sensors which are remotely distributed throughout a protected area. The laser thermal testing system includes a first laser and a second laser. ... | 08/22/1989 |
| 4845475 | Automatic testing of position sensing devices employing stored sensed position An automatic testing method and apparatus for proximity switches toggles a proximity switch while storing the initial state of the proximity switch until the toggling is successfully completed. Both the proximity switch position and the validity of the in... | 07/04/1989 |
| 4837508 | Process and device for checking the operational state of a variable reluctance magnetic sensor and their application to automobile electronics The device includes a comparator (4) fed by a quasi-sinusoidal signal (3) delivered by a variable reluctance sensor, for converting alternations of the signal into pulses acceptable by digital computing means. According to the invention, the device includ... | 06/06/1989 |
