EP0873643A1 - Dispositif de securite - Google Patents

Dispositif de securite

Info

Publication number
EP0873643A1
EP0873643A1 EP96931176A EP96931176A EP0873643A1 EP 0873643 A1 EP0873643 A1 EP 0873643A1 EP 96931176 A EP96931176 A EP 96931176A EP 96931176 A EP96931176 A EP 96931176A EP 0873643 A1 EP0873643 A1 EP 0873643A1
Authority
EP
European Patent Office
Prior art keywords
control means
detector
alarm
operable
monitoring centre
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96931176A
Other languages
German (de)
English (en)
Inventor
Patrick Joseph Farragher
Stephen Thomas Currah
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricardo AEA Ltd
Original Assignee
Farragher Patrick Joseph
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Farragher Patrick Joseph filed Critical Farragher Patrick Joseph
Publication of EP0873643A1 publication Critical patent/EP0873643A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems

Definitions

  • This invention relates to a security system, in particular to a security system for use in a domestic situation.
  • GB 2,167,625 B discloses a remote subscriber interaction system which comprises a scanner connected through the public telephone network to a subscriber unit at a location remote from the scanner.
  • the subscriber unit is in communication with various instruments at the remote location, which instruments are operable to send a signal to the subscriber unit when an alarm situation is detected thereby.
  • the subscriber unit transmits a continuous below audible signal to the scanner.
  • the continuous signal is interrupted so that the scanner is informed of the alarm situation.
  • the scanner automatically sends an interrogating signal to the subscriber unit.
  • the subscriber unit provides the scanner with information on the source of the alarm.
  • the interrogating signal and the subsequent response are each transmitted in the audible frequency range.
  • a problem with a system of the type described in GB 2,167,625 B is that the subscriber unit has to permanently transmit a signal to the scanner, in addition, there are no provisions which enable the scanner to assess the risk of an alarm signal being false. Furthermore, the scanner is not immediately informed of the source of the alarm signal but instead has to send an interrogating signal to the subscriber unit.
  • a security system comprising a monitoring centre connected via a communication system to control means at a remote location, and at least one detector associated with said control means, each detector being operable to detect an alarm situation and transmit a detector signal to said control means, wherein on receipt of said detector signal said control means is operable to inform said monitoring centre of said alarm situation, characterised in that said control means is operable to inform said monitoring centre of said alarm situation by sending an alarm signal thereto and a two way audio communication link is provided between said control means and said monitoring centre, so that on receipt of said alarm signal from said control means said monitoring centre is able to verify the alarm situation by using the two way audio communication link, thereby reducing the risk of false alarms
  • control system for use in a security system, which control system comprises control means for connecting to and communicating with a monitoring centre at a remote location, at least one detector associated with said control means, each detector being operable to detect an alarm situation and transmit a detector signal to said control means, wherein on receipt of said detector signal said control means is operable to inform said monitoring centre of said alarm situation, characte ⁇ sed in that said control means is operable to inform said monitoring centre of said alarm situation by sending an alarm signal thereto, and said control means is adapted to be connected to said monitoring means so that a two way audio communication link is formed between said control means and said monitoring centre, so that on receipt of said alarm signal from said control means said monitoring centre is able to verify the alarm situation by using the two way audio communication link, thereby reducing the risk of false alarms
  • said detector signal transmitted by each detector is a unique such signal which carries information identifying said detector and said control means is operable to recognise said detector signal, wherein said control means is operable to transmit alarm signals corresponding to detector signals from specified detectors to said monitoring means, so that on receipt of said alarm signal from said control means said monitoring centre is able to identify the detector from which said alarm signal originated and which of the detectors are specified, so that by using the information on the said detectors in cooperation with the two way audio communication link said monitoring centre is able to verify the alarm situation
  • control means has two modes of operation, in a first one of which all of said detectors at said remote location are specified and in a second one of which not all of said detectors at said remote location are specified
  • the first mode is an 'away' mode which may be used to set the system when the remote location is unoccupied.
  • the second mode is a 'home' or 'unset' mode which may be used to set the system when the remote location is occupied
  • the control means is operable to send alarm signals to the monitoring station only from detectors in a specified zone of the remote location
  • the 'unset' mode may be such that the control means is operable to send alarm signals to the monitoring centre from a specified type of detector
  • the specified type of detector may be, for example, a smoke detector
  • a combination of the home and unset modes may be used.
  • the monitoring centre may verify the alarm signal when the system is in the home or unset modes by using the two-way communication link to enable a conversation between the system user and the monitoring centre When the system is in the away mode the monitoring centre may verify an alarm signal using the two-way communication link to enable the monitoring centre to monitor sounds at the remote location
  • the monitoring centre may also be able to detect the sequence of activation of the detectors, thereby assisting in the assessment of the risk
  • the communication system may be the public switched telephone network system (PSTN) or integrated services digital network (ISDN) or a cellular or radio telephone network system or a cable network system.
  • PSTN public switched telephone network system
  • ISDN integrated services digital network
  • said at least one detector is in wireless communication with said control means.
  • the at least one detector may be for example a smoke detector, a detector for detecting the presence of intruders, a flood detector, a gas detector, for example carbon dioxide, and other such detectors.
  • a user activatable alarm operable to transmit a signal to said control means, which user activatable alarm may be activated manually or by using a radio signal which is transmitted from a unit carried by the user.
  • control means is set in a given mode using a key pad data entry system or a touch tone telephone.
  • the control means may alert the monitoring centre by dialling predetermined telephone numbers to open a line or channel of communication and then sending a signal along that line or channel.
  • the control means may be provided with means operable to delay alerting the monitoring centre when a signal indicating an alarm situation has been received until a preselected time has elapsed, in order that a user can reset the system before an alarm signal is sent to the monitoring centre, when, for example, a detector has been activated but there is no alarm situation.
  • Programmable timing means may also be provided in the control means, so that after a preselected period of time a request signal is automatically sent from the control means to the monitoring centre to request that routine management and maintenance checks are conducted.
  • the system may also be provided with a siren or some other audio alarm connected to the control means, said audio alarm being operable to sound when an alarm signal is sent to the monitoring centre
  • a system comprising control means operable to store predetermined information on the average movements of a person over a preselected time interval, monitoring means operable to monitor the actual movements of the person over that time interval, and transmitting means operable to transmit information on the actual movements from the monitoring means to the control means, said control means being operable to compare the information on the actual movements of the user with the stored information, wherein any absence of movement would result in an alarm being raised
  • the alarm may be a siren operable to attract attention to the plight of the user
  • the control means may be connected through a communication systen, for example the public telephone network service, to a monitoring centre to which an alarm signal can be sent A two-way communication link between the monitoring centre and the control means may be provided When an alarm is raised the two-way communication link may be used to contact the user to establish whether or not they require assistance
  • detectors may be provided, each detector being operable to detect an alarm situation and transmit a detector signal to said control means, wherein on receipt of said detector
  • a self testing detector comprising detecting means operable to detect a preselected physical change and send an alarm signal to activate alarm means when such a change is detected, and simulating means operable automatically to produce a signal which causes said detecting means to react as though it detected said physical change
  • the detector may be a smoke or gas detector comprising detecting means operable to detect the presence of smoke or gas and send an alarm signal to activate alarm means when smoke or gas is so detected
  • the detector may be an infra red radiation detector comprising detecting means operable to detect the presence of infra red radiation and send an alarm signal to activate alarm means when such radiation is so detected
  • said simulating means comprises a microprocessor
  • the microprocessor may be operable to produce said simulating signal automatically at periodic intervals, for example every hour
  • the drawing shows a security system comprising a group of peripheral detectors 5 in radio communication with a communication hub 7, which hub 7 is able to communicate with a monitoring centre 11
  • the detectors 5 and the communication hub 7 are located typically in a user's premises
  • a siren 8 is provided at the user's premises
  • a user unit 13 having a data entry key pad 9 and audio communication means
  • a touch tone telephone 14 each of which are connected to the hub 7
  • the monitoring centre 11 is at a location remote from the communication hub 7 and typically is permanently manned
  • the hub 7 is typically connected to the monitoring centre 11 via a communication system such as a public switched telephone network (PSTN) or an integrated services digital network (ISDN) or a cellular or radio telephone network system or a cable network system
  • PSTN public switched telephone network
  • ISDN integrated services digital network
  • cellular or radio telephone network system or a cable network system
  • the audio communication means in the user's premises typically includes a sensitive microphone so that sounds in the user's premises can be readily detected, and so monitored by the monitoring centre 11
  • the detectors 5 are typically wireless auto-reporting battery powered detectors Each detector 5 has a unique identity which is part of its serial number and each is operable to transmit to the hub 7 a unique signal which can be readily identified. This signal contains information on the status of the detector 5, that is whether or not the detector is detecting a potential alarm situation.
  • each system is provided with passive infra red (PIR) intruder detectors and smoke detectors but may also include flood detectors, gas detectors, for example carbon dioxide detectors, and other such detectors.
  • PIR passive infra red
  • the intruder detectors should ideally be positioned to detect an intruder entering the premises from any window or door, in particular the main entrance/exit.
  • the hub 7 is operable to send alarm signals to the monitoring centre 11 via the communication system and has three modes of operation, an 'away' mode, a 'home' mode and an 'unset' mode.
  • the communication hub 7 is operable to send an alarm signal to the monitoring centre 11 in response to a radio signal indicating an alarm situation transmitted from any of the detectors 5. This mode would be used when the premises are left unattended.
  • the communication hub 7 is operable to send alarm signals to the monitoring centre 11 in response to a radio signal indicating an alarm situation transmitted from detectors 5 in a specified zone of the premises. This enables a user of the system to set for example all of the detectors 5 on the ground floor of his premises, whilst leaving the intruder detectors 5 on an upper floor inactive.
  • the communication hub 7 is operable to send an alarm signal to the monitoring centre 11 in response to a radio signal indicating an alarm situation transmitted from any of a specified group or type of detectors 5.
  • the specified group or type of detectors 5 may be, for example, smoke detectors This enables a user to effectively de-activate the intruder detectors but activate the smoke detectors so that people can move freely around the premises but still have the benefit of the enabled smoke detectors
  • the alarm signals sent from the hub 7 to the monitoring centre 11 contain information relating to the mode of operation the hub 7 and the identity and nature of the detector from which the alarm signal originated
  • connection between the hub 7 and the monitoring centre 11 may be a dedicated line or channel or may be the premise's telephone line or channel
  • the hub 7 is provided with a facility to enable it to clear the telephone line or channel in the event of the line or channel being in use when it is necessary to send a signal to the monitoring centre 11
  • the hub 7 may utilise a three way calling facility such as those provided by PSTN service providers so that in the event of the telephone line being engaged, there is a "free" line to enable an alarm signal to be sent
  • there is always a line or channel available for sending signals from the hub 7 to the monitoring centre 11 This is advantageous because it prevents the alarm system being disabled by a person merely telephoning the premises and engaging the line or channel
  • This has the further advantage that it is not necessary to ensure that knowledge of the telephone number of the premises is restricted, as mere knowledge of the number will not enable a potential intruder to disable the system
  • the user of the system is given a unique personal identification number (PIN) so that the communication hub 7 can only be set in the appropriate mode by the user
  • PIN personal identification number
  • the hub can be set in any of these different modes using the data entry key pad 9 which is connected to the monitoring centre 11 via the hub 7
  • This pad 9 typically has three buttons marked 'away', 'home' and 'unset'
  • the system is set when the user's PIN is entered using the key pad 9 and the appropriate mode button is pressed
  • the mode may be selected by entering the PIN via the touch tone telephone 14 which is connected directly into the communication hub 7 and then keying in a preselected number for the appropriate mode
  • the monitoring centre 11 can detect the mode in which the system is set
  • the key pad 9 is connected to the audio communication means on the user unit 13 and is provided with a button which is operable to open the two-way audio communication between the user unit 13 and the monitoring centre 11
  • the monitoring centre 11 is also provided with means operable to open a direct line of audio communication between it and the user unit 13
  • the two-way audio communication link between the audio communication means on the user unit 13 and the monitoring centre can only be opened by the monitoring centre 11 when an alarm signal is received thereby
  • the two-way audio communication link enables a person in the monitoring centre 11 to converse with the system user Alternatively, it enables someone in the monitoring centre to listen for sounds in the premises when they should be unoccupied
  • An alert button 15 is also provided in the user's premises for use in, say, a medical emergency
  • the alert button 15 can be activated to transmit a radio signal, again having a unique identity, to the communication hub 7 to indicate an alarm situation
  • the alert button 15 can be activated manually or by using a radio signal transmitted from a unit which may be carried by a user of the system
  • the touch tone telephone 14 can also be used for making telephone calls in the normal manner and communicating with the monitoring centre 11
  • the telephone 14 may be used as an intercom to the entry/exit keypad 9 and may be used in conjunction with a clock built into the hub 7 for wake-up calls
  • the telephone 14 is installed in the user's bedroom, so that the user could set the system in the home mode with say the intruder detectors 5 activated in a lower floor of the house without having to walk through the house to do so, and then subsequently alter the setting so that the lower floor intruder detectors are de-activated
  • the user's PIN is never transmitted over the network to the monitoring centre 10 11 for security reasons
  • the monitoring centre 11 can be contacted immediately using the two-way audio communication link either by using the audio communication means in the user unit 13 or by using the telephone 14
  • the monitoring centre 11 is so contacted, the user must identify himself by giving his name, address and a 15 password
  • the communication hub 7 automatically gives its identity as an additional check
  • the monitoring centre 11 can then cancel the PIN and a new PIN can be entered by the user
  • the premises are divided into zones which 20 define the 'home' and 'away' zones In the unset mode, detection signals from the intruder detectors do not result in alarm signals being sent to the monitoring centre 11 However, detection signals originating from any of the other detectors will result in an alarm signal being sent to the monitoring centre 11 Also during installation, the serial numbers of each detector 5 are entered 25 in the communication hub 7 along with the preselected telephone numbers for the monitoring centre 11
  • the communication hub 7 responds by sending an alarm signal to the monito ⁇ ng centre 11 by dialling a preselected telephone number to open a line or channel of communication and then transmitting the alarm signal along that line or channel to the monitoring centre 11
  • This alarm signal contains information which enables the monitoring centre 11 to identify the location from which the alarm signal was sent and which of the detectors 5 at that location was activated
  • the alarm signal contains information relating to the mode of operation of the hub 7, so that when the monitoring centre 11 is alerted to an alarm situation it has knowledge of whether or not the premises should be occupied
  • the two-way link enables the monitoring centre 11 to listen for sounds from inside the house and thereby aids the monitoring centre 11 in its assessment of whether or not there is a risk situation
  • the monitoring centre 11 receives signals which enable it to identify which detector 5 is activated
  • the monitoring centre 11 can also detect the multiple activation of detectors 5 This helps in the assessment of risk, as it is unlikely that a failure or a false activation of more than one detector would occur at the same time.
  • the monitoring centre 11 can also detect the sequence of any such multiple activation, thereby enabling the monitoring centre 11 to monitor a pattern of movement of, for example, an intruder moving throughout the premises Again, this assists the assessment of the risk Therefore, when more than one detector is activated, this indicates to the monitoring centre 11 that there is an alarm situation which must be dealt with urgently
  • the cooperation between the monitoring centre 11 , and the communication hub 7 at the remote location enables alarm signals to be verified, thereby making the system effective and reducing the likelihood of an emergency service being alerted by a false alarm
  • the system When a user leaves his premises unattended the system should be set in the away mode, usually using the data entry key pad 9 If an error is made when typing in the PIN, the user can cancel the number and then retype A preselected time period is allowed within which the user must vacate the premises before the system is fully set The set time is indicated by a flashing light and a beeping sounder When the user retums to the premises and opens the door, the exit/entrance intruder detector detects this but the communication hub 7 does not alert the monitoring centre 11 until a preselected time has elapsed, in order to give the user time to enter their PIN and press the 'unset' button, which prevents a false alarm signal being sent When the user wishes to set the system in the home mode this can be done using the key pad or the touch tone telephone 14
  • the hub 7 can be set up so that when it is set in the away mode then if any of the detectors 5, except an intruder detector at the entry door, are activated an alarm signal is sent to the monitoring centre 11 immediately In the home mode there is usually a time delay before an alarm signal is sent to the monitoring centre 11 , so that if the system is accidentally triggered by the user then they have time to cancel the alarm signal
  • the system user is also provided with a 'duress' code This code would be used when for example a user was being forced to enter their premises with an unwelcome party.
  • the duress code number is entered the system appears to close down, but in fact the monitoring centre 11 is automatically alerted to the emergency situation and can react by contacting the appropriate emergency service.
  • a system is also envisaged in which information on the average day to day movements of the user of the system is stored in a communication hub 7 and monitors are provided which are operable to monitor the actual movements of the user and transmit that information to the hub 7 The actual movements are then compared by communication hub 7 with the stored information, and any deviation from the normal pattern of movement throughout the day, in particular lack of movement, would result in an alarm signal being raised
  • the alarm may be a siren operable merely to attract attention to the plight of the user.
  • This system could be fully located at the user's premises, or incorporated into the comprehensive security system described above, with the communication hub 7 connected through a communication system to a monitoring centre 11 , to which an alarm signal could be sent
  • a two-way communication link between the monitoring centre and the communication hub 7 may be provided When an alarm is raised the two-way communication link may be used to contact the user to establish whether or not they require assistance.
  • the provision of a two-way voice communication system between the hub 7 and the monitoring centre 11 is highly advantageous as it enables communication between the monitoring centre 11 and the system user It provides a permanent help line
  • One of the most common problems in the home security systems industry is keying in the wrong entry/exit code and/or getting confused with the system operation.
  • By providing a two-way voice communication facility this means that problems can be easily resolved by talking to the user and thereby reduces the risk of false alarms.
  • the two-way communication system also provides a medical and/or emergency alarm system.
  • Monitoring, programming and testing of the communication hub 7 may be performed from the monitoring centre 11. Remote testing on a periodic basis will ensure that the subscriber's apparatus is functioning correctly. In cases where a fault may exist that fault may be identified before the subscriber is even aware of the fact. When a particular detector 5 is causing a problem through a failure or other false alarm, that device can be put out of service from the monitoring centre 11 , leaving the rest of the system in a functional mode until it is convenient for a service engineer to fix the fault.
  • the detectors 5 may be self testing.
  • the self testing may be effected in each case by automatically producing an electrical stimulus which, if the detector is functioning properly, should cause the detector to believe it is detecting something and then monitoring the detector's response to that stimulus. This can be done using a microprocessor in the detector.
  • Standard smoke detectors comprise an ionisation chamber which is sensitive to smoke and a detector which is operable to measure any distrubances therein. When any such disturbances are detected an alarm signal is generated and then transmitted. Standard smoke detectors are also routinely provided with a test pin which can be activated manually to create a disturbance in the ionisation chamber, which distrubance should cause the detector to produce an alarm signal. Hence when an alarm signal is produced the user of the detector is reassured that it is still functioning properly, and otherwise the user is made aware of the fact that the detector is faulty.
  • the self testing smoke detector of the present invention includes typically a microprocessor, which microprocessor is operable to produce automatically a disturbing signal on the test pin which causes the detector to believe that there is smoke in the ionisation chamber
  • the signal produced at the detector output then causes an alarm signal to be generated, which signal is recorded by the microprocessor but does not result in an alarm signal being sent to the hub 7
  • an alarm signal is not generated and this is also recorded by the microprocessor
  • a reporting signal is then transmitted to the hub 7, which reporting signal contains information identifying the detector and whether or not it is functioning properly
  • the hub 7 is notified of a faulty detector 5, it transmits a fault signal identifying the faulty detector to the monitoring centre 11
  • these comprise an infra red sensor which is operable to transmit a signal to its output when it detects infra red radiation When such a signal is received at the output an alarm signal is generated and then transmitted
  • the self testing PIR detector of the present invention typically further includes a microprocessor, which microprocessor is operable to produce automatically a disturbing signal at the input of the sensor which causes the output to believe that infra red radiation has been detected The sequence of recording and reporting faults is then similar to that described above for the smoke detectors
  • the self testing detectors 5 may be arranged to run a self test say every hour
  • All of the detectors 5 are auto-reporting and so periodically give a status report to the communication hub 7 that they are still present working and that the battery is functioning
  • the self testing is conducted just before the auto-reporting, so that the results of the self testing can be sent with the auto- reportmg signal
  • the smoke detectors may be configured to measure the density of smoke detected This can be done by measuring the mean voltage at the output of the detector, as this voltage is linearly proportional to the density of the smoke in the ionisation chamber This voltage signal is passed through an analogue to digital converter and the resultant signal is processed in a microprocessor, to determine the smoke density The final information on the density of the smoke is then transmitted to the hub 7 This information is then sent to the monitoring centre 11 Hence, for example, if cigar smoke is detected, as a result of the density measured this may be differentiated from smoke from a fire, thereby assisting in reducing the risk of false alarms
  • a programmable timer may be provided in the communication hub 7, so that after a preselected period of time a request signal is automatically sent from the communication hub 7 to the monitoring centre 11 to request that routine management and maintenance checks are conducted
  • these may be operable to detect multiple activations in addition to single activations, and possibly several multiple activations and transmit information on such activations to the monitoring centre 11 This information can then be used by the monitoring centre 11 to identify false alarms
  • the detectors 5 may contain intelligence operable to randomise the transmission of the detector signals in such a way that signals emitted thereby are difficult to jam or block.
  • the signals may be sent more than once, in groups more than once, with random delays between the first transmission and subsequent groups of transmissions
  • the hub 7 which monitors all signals from the detectors 5 can then detect attempts at continuous and intermittant jamming by analysing the nature of the received signal If the hub 7 detects attempts to block or jam the signal from any of the detectors 5 a signal carrying this information is sent to the monitoring centre 11 , which information will assist the monitoring centre 11 in assessing whether there is a false alarm.
  • the detectors 5 should preferably be arranged to contain intelligence developed in such a way as to maximise the lifetime of the battery Software is provided to monitor various physical and environmental conditions, so that when there is no activity to monitor, the detector switches into a low power or 'sleep' mode, awakening periodically to re-assess the sensor's surroundings, but when activity does occur the detector automatically 'wakes up'. This technique permits battery lives of 5 to 14 years

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)

Abstract

Cette invention concerne un dispositif de sécurité comportant un centre de surveillance (11) relié, par l'intermédiaire d'un système de communication, à au moins un organe de commande (7) placé en un emplacement éloigné, l'organe de commande (7) et le centre de surveillance (11) étant reliés par une liaison de communications basse fréquence bidirectionnelle et l'organe de commande (7) étant équipé d'au moins un détecteur (5). Chaque détecteur (5) fonctionne de façon à transmettre un signal porteur d'informations qui peuvent être reconnues par l'organe de commande (7) et qui indiquent s'il existe ou non une situation d'alerte potentielle. Lorsqu'il détecte une telle situation d'alerte, l'organe de commande (7) envoie un signal d'alerte au centre de surveillance (11). Lorsqu'il reçoit un tel signal d'alerte, le centre de surveillance (11) est capable d'identifier l'emplacement où se produit cette situation d'alerte de même que la nature de l'urgence, de telle sorte qu'il est possible de solliciter l'assistance adéquate.
EP96931176A 1995-09-21 1996-09-23 Dispositif de securite Withdrawn EP0873643A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9519261 1995-09-21
GBGB9519261.3A GB9519261D0 (en) 1995-09-21 1995-09-21 A security system
PCT/GB1996/002343 WO1997013230A2 (fr) 1995-09-21 1996-09-23 Dispositif de securite

Publications (1)

Publication Number Publication Date
EP0873643A1 true EP0873643A1 (fr) 1998-10-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96931176A Withdrawn EP0873643A1 (fr) 1995-09-21 1996-09-23 Dispositif de securite

Country Status (4)

Country Link
EP (1) EP0873643A1 (fr)
AU (1) AU6996996A (fr)
GB (1) GB9519261D0 (fr)
WO (1) WO1997013230A2 (fr)

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WO1997013230A2 (fr) 1997-04-10

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