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| Number | Title | Issue Date |
| 7990261 | Speaker circuit resident notification appliances Both notification appliances and speakers usable to broadcast verbal messages into a region can be coupled to common signal and power providing communication lines. Composite output modules can include speakers, horns, and strobe lights, all without limitation, whic... | 08/02/2011 |
| 7834756 | Failure current measurement for electronic control module A method and system for assessing or otherwise determining defective operation of an electronic control unit (ECU). The ECU may be a vehicle or non-vehicle ECU having any number of modules configured to provide and/or support any number of operations. The defective ... | 11/16/2010 |
| 7372369 | Monitoring of alarm system wiring A supervisory method and apparatus provide for detection of “partial fault” conditions such as a relatively high series impedance in the wiring, or a relatively low parallel impedance across the wiring. A non-linear element, such as a semiconductor diode, can be... | 05/13/2008 |
| 7333010 | Method and apparatus for verifying operation of notification appliances during low input voltage condition A method for verifying operation of notification appliances on a notification appliance network during low input voltage conditions is provided. An output voltage is supplied to a network and is measured at a control panel. An input parameter is measured at a notifi... | 02/19/2008 |
| 7161478 | Methods and apparatus for generating a data structure indicative of an alarm system circuit A user of a computer aided design (CAD) system graphically places fire alarm appliances, such as smoke detectors and sirens, in a drawing area. After elements are placed and physical paths are determined, a series of electrical circuit connections between alarm sour... | 01/09/2007 |
| 7126487 | Circuit and method for prioritization of hazardous condition messages for interconnected hazardous condition detectors An interface circuit and method for use in interconnected hazardous condition detectors is provided. This circuit and method prioritizes the various hazardous condition alarms to ensure that only the highest priority or greatest threat alarm is sounded when such a c... | 10/24/2006 |
| 7091855 | Fire alarm with distinct alarm reset threshold A hazard alarm includes: a detector for detecting a hazard parameter; trigger logic; and reset logic. The trigger logic triggers an alarm state when the measured parameter reaches a predetermined trigger threshold. The alarm state is maintained until a reset is succ... | 08/15/2006 |
| 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 supply with a prioritized back-up response, allowing a lower cost UPS (uni... | 07/25/2006 |
| 7079022 | Emergency activation apparatus for a technical device A safety device is provided that can be connected with a technical device and an associated emergency activation apparatus. The safety device includes a rail. The rail and emergency activation apparatus are fashioned such that the emergency activation apparatus can ... | 07/18/2006 |
| 7058967 | Video distribution system and method An integrated video distribution system for distributing video signals from a plurality of sources. The system includes a digitizer arrangement arranged to receive analog video signals from a plurality of video sources. The analog video signals are digitized in YCrC... | 06/06/2006 |
| 7054771 | Bus line current calibration Disclosed herein is a method and system for calibrating line drive currents in systems that generate data signals by varying line drive currents and that interpret the data signals by comparing them to one or more reference voltages. The calibration includes varying... | 05/30/2006 |
| 7030748 | Enhanced visual signaling for an adverse condition detector An adverse condition detector that allows the user to visually determine the type of adverse condition being detected. The adverse condition detector includes a sensor and a control unit coupled to the sensor. When the sensor detects an adverse condition above a sel... | 04/18/2006 |
| 7005981 | Method and apparatus for the extraction and compression of surveillance information to facilitate high performance data fusion in distributed sensor systems A method and apparatus for the generic extraction and compression of surveillance information that facilitates high performance data fusion in distributed sensor systems. According to the method, multiple sensors (120[1] . . . 120[N]), distributed over a wide... | 02/28/2006 |
| 6992575 | Methods and apparatus for generating a data structure indicative of an alarm system circuit A user of a computer aided design (CAD) system graphically places fire alarm appliances, such as smoke detectors and sirens, in a drawing area. After elements are placed and physical paths are determined, a series of electrical circuit connections between alarm sour... | 01/31/2006 |
| 6954142 | Surveillance system and method A sensor system in which a sensor suite has a locally located field sensing unit (FSU) that converts and evaluates sensor information using sensor fusion algorithms and is thereby able to send qualitative low-bandwidth, low power usage signals to a remote command po... | 10/11/2005 |
| 6816125 | Forming electromagnetic communication circuit components using densified metal powder Manufacturing techniques are described for forming electrical components. For example, a layer of a metal powder composition is deposited onto at least a portion of a substrate. Pressure is applied to the metal powder composition by hydraulic press that has one or m... | 11/09/2004 |
| 6642843 | Management system A management system is provided with a sensor control means located in each region of a multiple occupancy building and a management apparatus connected to and able to communicate with the sensor control means. The sensor control means are connected with ... | 11/04/2003 |
| 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 spaced apart devices coupled thereto. Alternately, the protoc... | 06/10/2003 |
| 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 transmit information between a common control unit and a p... | 12/24/2002 |
| 6483431 | Electrical circuit for transmitting state information, in particular concerning some member in railway rolling-stock, and an electrical system incorporating such a circuit An electrical circuit for transmitting an item of information relating to the state of a parameter or of a piece of equipment, in particular for application in the railway field. The circuit includes a device for regulating the current flowing through the... | 11/19/2002 |
| 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 transmit information between a common control unit and a p... | 05/07/2002 |
| 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 pulsating signal to indicate the absence of a head from its bas... | 07/10/2001 |
| 5804891 | Battery saving switching mechanism An intelligent switching mechanism for the backup batteries of an alarm system is disclosed. When AC input power has failed but no alarm has been declared, the batteries are switched into a parallel configuration, which is sufficient to supply the control... | 09/08/1998 |
| 5757265 | Multiple-cable field bus system A field bus system may be used in which transmission ability of the system can be maintained even if communication error occurs due to noises or failure of a transmission line. The system can be easily shifted at a lower cost from a conventional system to... | 05/26/1998 |
| 5448231 | Method and apparatus for transmitting signals on a transmission line The present invention provides a method and apparatus for transmitting signals on a transmission line, the transmission line having a DC current flowing therethrough and having a plurality of terminals connected thereto in a multidrop fashion. Each of the... | 09/05/1995 |
| 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 address register, and a nonvolatile memory for containing an in... | 03/28/1995 |
| 5347225 | Network monitor and test apparatus An apparatus for monitoring and testing a twisted pair, particularly useful for an Ethernet network. First and second DC currents alternated with one another are applied to both ends of the line, asynchronously. By monitoring the potential on the line, a ... | 09/13/1994 |
| 5260664 | Network monitor and test apparatus An apparatus for monitoring and testing a twisted pair, particularly useful for an Ethernet network. First and second DC currents alternated with one another are applied to both ends of the line, asynchronously. By monitoring the potential on the line, a ... | 11/09/1993 |
| 5216410 | Intrusion alarm sensing unit The present invention is directed to an intrusion detection system having two different types of motion sensors and processing of the signals produced by the motion sensors in a manner to provide a reliable indication of motion within the space being sens... | 06/01/1993 |
| 5200734 | Detecting and alarming system for detecting shortcircuited or broken circuit A detecting and alarming system includes a main alarm circuit provided in a headquarter control center, at least a terminal alarm circuit provided at a local station, and at least a connecting loop conecting the main alarm circuit and each terminal alarm ... | 04/06/1993 |
| 5144283 | Energy efficient alarm system and regulative central control unit An alarm system includes an electronic central controller or control unit with an internal intrusion sensor. The controller is powered by a single nine volt battery. The system can be expanded by adding auxiliary sensors such as sound discriminators, glas... | 09/01/1992 |
| 5121102 | Programmable voltage source with isolation network A circuit for detecting the occurrence of an event and for providing an output signal upon the detection of the event includes a sensor for detecting the occurrence of the event. A programmable voltage source is interconnected to the sensor for generating... | 06/09/1992 |
| 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 |
| 5083107 | Fire alarm system A fire alarm system includes a receiver unit such as a fire control panel or a repeater having zone lines connected thereto, with various types of fire detectors being connected to the zone line. Supervising power is normally supplied to the zone lines. W... | 01/21/1992 |
| 5057816 | Multizone intruder detection system with forced walk-test A multizone intruder detection system comprises a supervisory circuit for verifying, while the system is disarmed, that each of a plurality of intrusion sensors is, indeed, functional. The supervisory circuit inhibits rearming of a disarmed system until i... | 10/15/1991 |
| 5057817 | Intruder detection system with passive self-supervision A multizone intruder detection system comprises a supervisory circuit for verifying, from normal traffic or activity in each of the zones of protection while the system is disarmed, that each of the intrusion sensors is, indeed, functional. In the event o... | 10/15/1991 |
| 4970508 | System for monitoring switch locations A system is provided for electronically monitoring a group of sensor switches employed at remote locations in security or alarm systems. To monitor the status of individual switches, a matrix of conductors is employed. The matrix has a predetermined numbe... | 11/13/1990 |
| 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 signal pick-up system allows to distinguish actuation of in... | 05/23/1989 |
| 4760379 | Fail-safe high temperature alarm A temperature sensor located at a region being monitored controls an output switch that in one position when ambient temperature is below a predetermined temperature applies current to only a first loop circuit and in another position when ambient tempera... | 07/26/1988 |
| 4728861 | Light control apparatus for a vehicle A light control apparatus for a vehicle is integrated with headlamp driving relays, a light sensor, a lighting switch which selects a manual mode or an automatic mode, and a control unit which controls the relays in accordance with the light sensor output... | 03/01/1988 |
