GB2248331A - Surveillance alarm system - Google Patents
Surveillance alarm system Download PDFInfo
- Publication number
- GB2248331A GB2248331A GB9020986A GB9020986A GB2248331A GB 2248331 A GB2248331 A GB 2248331A GB 9020986 A GB9020986 A GB 9020986A GB 9020986 A GB9020986 A GB 9020986A GB 2248331 A GB2248331 A GB 2248331A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal transmission
- base station
- transmission means
- alarm system
- signal
- 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- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
- G08B13/1427—Mechanical actuation by lifting or attempted removal of hand-portable articles with transmitter-receiver for distance detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
- G08B21/0241—Data exchange details, e.g. data protocol
- G08B21/0247—System arrangements wherein the alarm criteria uses signal strength
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
- G08B21/0286—Tampering or removal detection of the child unit from child or article
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- General Health & Medical Sciences (AREA)
- Computer Networks & Wireless Communication (AREA)
- Alarm Systems (AREA)
Abstract
The system 1 is suitable for use in signalling when excursions of a body 2 outside a predetermined zone take place. The system comprises a base station 6 and portable signal transmission means 4, attached to the body (2). The base station 6 has receiving means (R, Fig 3) to receive signals 10 transmitted by the signal transmission means 4. A first processor (P1) converts the received signal 10 into values that correspond to the distance between the base station (6) and the transmission means 4. A comparator (C) compares the received signal 10 with a predetermined signal value and a second processor (P2) actuates an alarm signal (A) upon detection of a received signal (10) value that corresponds to a distance greater than the predetermined distance. <IMAGE>
Description
ALARM SYSTEM
The present invention relates to an alarm system suitable for use by parents or the like, for the supervisory surveillance of children under their care when playing outdoors or the like.
The most common and indeed almost the only effective present method of child surveillance is by continuous direct visual and/or audio monitoring by a parent of their offspring. Such constant attention to a child when playing for instance is often impractical and consequently checks are generally limited to more or less frequent intervals. Alternatively parents may simply assume that their child is in a "safe" location because he/she is playing in the garden or in an adjacent street with other children.
The number of accidents involving children wandering off, becoming lost or being trapped in old buildings or caves for example in addition to the increasing problem of child abduction not only by strangers but also by estranged parents or their agents, have made many parents unwilling to let their children out of their sight even for the shortest time, thereby restricting children to the confines of the home and hence the range of activities they can enjoy.
It is an object of the present invention to avoid or minimise one or more of the above disadvantages.
The present invention provides a surveillance alarm system suitable for use in signalling excursions of a body outside a predetermined zone which system comprises a base station and portable signal transmission means attachable in use to said body, said base station comprising receiving means formed and arranged to receive signals transmitted by said signal transmission means on said body; first processor means formed and arranged for converting said received signals into received signal values corresponding to the distance between said signal transmission means and said base station; comparison means formed and arranged to compare the received signal value with a predetermined distance signal value and second processor means formed and arranged for actuating an alarm signal output means upon detection of a received signal value corresponding to a distance greater than the predetermined distance whereby an excursion of said body outside said predetermined zone may be signalled.
It will of course be appreciated the surveillance alarm system of the invention has many applications therefore said body, which may be that of a child may also include: prisoners in an open prison environment; newly born children in hospital; the old or mentally handicapped who may on occasion stray and become lost; domestic pets such as cats and dogs; and domestic farm animals such as cows, sheep and pigs. Other bodies which may be subjected to surveillance by means of the present invention include inanimate objects such as cars, caravans, boats, trailer units or other objects which may be stolen, for instance plant and machinery within a predetermined zone such as on a building site or the like.
Preferably said portable signal transmission means is more or less securely attached to said body in use thereof so that a child wearing said signal means or an abductor cannot remove and leave said signal means in said predetermined zone whilst the body exits the predetermined zone.
Advantageously, said signal transmission means includes a body proximity detection means formed and arranged to activate said signal transmission means to transmit a suitable signal to said base station when said signal transmission means is removed from the body in use thereof.
Preferably said body proximity detection means comprises a heat sensor formed and arranged to be worn in contact with the skin of a user so that if the body proximity detection means is removed, the resulting temperature fall sensed by the sensor causes said detection means to activate the signal transmission means to transmit a special alarm signal to said base station so as to activate the alarm signal output means, desirably so as to provide a distinctive alarm signal specifically alterting the responsible person to removal of the portable signally means.
In use on inanimate objects such as boats or caravans said body proximity detection means may include contact pressure sensors, electrical connection means, or magnetic field means formed and arranged to detect the presence or absence of the object to be surveyed, and activate the signal transmission means upon removal from the protected object and/or indeed in response to other forms of interference with the portable signalling means.
The signals transmitted and received by said signal transmission means and said receiving means respectively may be of any form suitable for short-range transmission, preferably up to at least 250m, if desired up to 1000m, between the base station and the portable signalling means. In electromagnetic radiation signals including infra-red and radio waves, but preferably radio transmission, especially very high frequency radio signals are preferred. Any suitable form of short-range radio signal transmission may be used including frequency modulated, amplitude modulated and/or pulse coded signals. Said radio transmission may be by a one-way transmission from said signal transmission means to said receiving means with said first processor means calculating the distance therebetween on the basis of the received signal strength for example or by any other suitable means.Preferably though signal transmission is a two-way transmission wherein said signal transmission means and said receiving means may include other radio transmission components such as transponders, responders, transmitters, receivers, reflectors, antennas, modulators, demodulators, coders, decoders or the like.
In applications where a plurality of bodies are to be monitored, for instance parents with two or more children, a single base station and a plurality of portable signal transmission means, one for each child, may be used wherein the signal transmitted by each respective signal transmission means may be coded for identification with a particular child and said base station is provided with decoder means formed and arranged to identify each signal from each corresponding signal transmission means. The base station is further provided with sequential sampling means formed and arranged to sample each incoming signal and pass said signal to the first processor means for processing. It will of course be appreciated that the base station may be provided with indicator means so that in an alarm situation, a parent for instance, can identify which child has left the predetermined zone.
The base station may also be provided with a direction indication means. Preferably said indication means is in the form of a radio compass formed and arranged for use with a display means for indicating the bearing direction of a signal transmission means source that has exceeded the predetermined zone limits.
In a further aspect the present invention provides a method of surveillance of children within a predetermined area comprising the steps of: providing a surveillance alarm system of the invention for surveillance of a predetermined zone corresponding substantially to said predetermined area; attaching a portable signal transmission means thereof to a child; and monitoring the output of the alarm signal output means of the base station of said alarm system.
Preferably said signals are not transmitted constantly but are transmitted as a coded pulse at suitable intervals e.g. every five seconds or so in order to greatly increase the life of a power supply of the signalling means where a storage cell or the like is used to power the signal transmission means, as well as to facilitate reception and identification of each of a plurality of signal transmission means it may be monitoring.
For convenience in use, said portable signal transmission means may be in the form of a strap-on device of a configuration generally similar to that of a wrist watch which may be worn on the arm or the leg or may be modified to be worn around the waist for instance. For inanimate objects, said portable signal transmission means may be provided with lockable interengagement means to provide a secure attachment to said body which is substantially resistant to unathorised interference.
The range of the transmitted signal may be limited to say 1000 metres thereby minimising the power requirement and the cost of the transmitting and receiving means, as well as any possible interference with other signal transmissions.
The alarm signal output means is desirably a loud audible warning means but said output means may include flashing lights or any other means of audio/visual tactile warning alarm signal. For base stations monitoring a plurality of bodies with individual signal transmission means, the signal output means may include a display, either digital or analogue, indicating which body has been detected leaving the predetermined zone.
It will of course be appreciated that the effective "alarm distance" i.e. the distance which when exceeded results in activation of the alarm signal output means, may be subject to variation due to localised modulation of the signals transmitted from the signal transmission means to the base station for instance to the topography of the land on which the system is in use which may give rise to loss and/or reflection of signals. Buildings for instance may cause "blind spots" or other irregularities in the zone being surveyed and interference from other sources may cause spurious alarm signals.For these reasons, the system is desirably provided with further processor means formed and arranged for use with indicator means on said base station to indicate conditions such as "No Signal", "Low
Power" and the like to warn the base station supervisor of one or more of a number of different possible situations requiring attention or investigation.
The base station may also be portable so that it may be carried e.g. to allow tracking of a body that has left the predetermined zone, or for transfer to a new surveillance zone e.g. on a family outing to the beach.
Furthermore, said portable signal transmission means may be provided with secondary receiver means formed and arranged to receive an alarm signal transmitted from the base station when said base station detects that said signal transmission means has left the predetermined zone; and alarm signal output means whereby a person in use of said signal transmission means would be informed for instance by an audible warning signal that they had exceeded the limit of the predetermined zone and/or to indicate to an abductor that the body being abducted has been detected by an alarm system.
Further preferred features and advantages of the present invention will appear from the following detailed description given by way of example of some preferred embodiments illustrated with reference to the accompanying drawings in which:
Fig. 1 is a schematic view of a surveillance alarm system of the invention in use;
Fig. 2 is view of a base station of the system in Fig.
1; and
Fig. 3 is a schematic representation of the main components of the surveillance alarm system of Figs. 1 and 2.
With reference to Fig. 1, a surveillance alarm system, generally indicated by reference number 1, is shown in use by a child 2 and a parent 8 thereof. The system 1 comprises two main components, the signal transmitter unit 4 worn by the child 2 and the base station 6 which is monitored by the parent 8 of said child 2. The transmitter unit 4 comprises a transponder (not shown) which transmits an F.M. (frequency modulated) radio signal 10 upon the reception of a interrogator signal 11 from the base station 6. The transmitted F.M. signal 10 is received by the base station 6 and processed using the time delay between transmission and reception of said signals to calculate the distance between the transmitter 4 and the base station 6 and hence the distance between the parent 8 and the child 2.If the child 2 is a greater distance away from the parent 8 that the predetermined distance entered into the base station 6 by the parent 8, then the base station 6 is arranged to set off an alarm to signal to the parent 8 that the child has exceeded the limits of the predetermined distance.
Fig. 2 shows the control panel 12 of the base station 6 in Fig. 1 and incorporates an operating range control 14 by means of which a desired predetermined "alarm distance" may be set, an audible alarm signal output 16 and a visual alarm signal output 18. As the base station 6 may be used to monitor one or more children wearing transmitter units 4 the control panel is provided with indicators 20 to indicate the children being monitored at a particular given time. A direction indicator 22 indicates in what direction a child which has exceeded the predetermined distance has taken thereby to facilitate the location of said child. The base unit 6 further comprises external aeriel means 23 for receiving signals 10 from the child's transmitter 4 and further indicators for "Low Power" 24, "No Signal" 26 and "Signal Strength" 28.
The block diagram representation in Fig. 3 shows schematically the main components of the surveillance alarm system 1 shown in Figs. 1 and 2. The transmitter unit 4 comprises a transponder T for transmitting a pulsed response F.M. radio signal 10 to the base station 6 upon reception of an interrogator signal 11 from said base station 6. A heat sensor S is built into the transmitter unit 4 and is formed and arranged for contact with the child's body e.g. wrist when worn.
Removal of the unit 4 causes a drop in the temperature sensed by said sensor S which in turn causes the transponder T to transmit an "unit removed" alarm signal 13 to the base station 6 receiver R.
The base station 6 comprises a transmitter Tr and a receiver R, the transmitter Tr transmits an interrogator signal 11 which will cause the transponder T to transmit a return signal 10 only if the correct interrogator signal 11 is received. The time taken for the transmitter Tr to transmit an interrogator signal 11 until the receiver R receives a response signal 10 is processed in conjunction with information about the wavelength of the radio signal employed by a processor
P1 to calculate a value corresponding to the distance between the base station 6 and the transmitter unit 4.
Said value is then compared by a comparator C with a value corresponding to the predetermined distance as entered by the parent 8. A second processor P2 processes the information from the compactor C and actuates the alarm signal output A if the distance between the child 2/transmission unit 4 and the base unit 6/parent 8 is greater than the predetermined distance. The first processor P1 is formed and arranged to directly actuate an "unit removed" alarm indicator I upon the reception of an "unit removed" alarm signal 13.
It will of course be appreciated that various modifications may be made to the embodiment hereinbefore described without departing from the scope of the present invention. Thus for example more powerful communication systems utilising e.g. satellite transmission techniques could be used where large areas and/or large numbers of bodies are to be monitored are involved such as in sheep farms, game reserves or the like whereby animal(s) straying across a predetermined boundary or poachers killing and/or stealing animals could be detected and accurately pinpointed on said boundary.
Claims (11)
1. A surveillance alarm system suitable for use in signalling excursions of a body outside a predetermined zone which system comprises a base station and portable signal transmission means attachable in use to said body, said base station comprising receiving means formed and arranged to receive signals transmitted by said signal transmission means on said body; first processor means formed and arranged for converting said received signals into received signal values corresponding to the distance between said signal transmission means and said base station; comparison means formed and arranged to compare the received signal value with a predetermined distance signal value and second processor means formed and arranged for actuating an alarm signal output means upon detection of a received signal value corresponding to a distance greater than the predetermined distance whereby an excursion of said body outside said predetermined zone may be signalled.
2. A surveillance alarm system as claimed in claim 1 wherein said portable signal transmission means is provided with locking interengagement means securely to attach said signal transmission means to a body in use thereof.
3. A surveillance alarm system as claimed in any one of claims 1 or 2 wherein said signal transmission comprises body proximity detection means formed and arranged to activate said signal transmission means to transmit a warning signal to said base station for actuating the alarm signal output means in the event of said signal transmission means being removed from said body.
4. A surveillance alarm system as claimed in any one of claims 1 to 3 wherein said signal transmission means are formed and arranged for transmitting short-range very high frequency radio signals.
5. A surveillance alarm system as claimed in any one of claims 1 to 4 wherein said base station includes a first transmitter means for transmitting interrogation signals, respectively, and wherein said at least one portable signal transmission means is in the form of a responder means including a second receiver means for receiving said interrogation signals and processor means formed and arranged for activating said portable signal transmission means so as to transmit signals to said base station in response to said interrogation signals.
6. A surveillance alarm system as claimed in any one of claims 1 to 5 wherein the portable signal transmission means processor means is formed and arranged for coding said signals transmitted by said portable signal with an identification code, corresponding to said portable signal transmission means.
7. A surveillance alarm system as claimed in claim 6 wherein said base station processor means is provided with decoder means formed and arranged for correlating signals received with respective individual portable signal transmission means.
8. A surveillance alarm system as claimed in any one of claims 1 to 7 wherein said base station comprises direction indication means formed and arranged for indicating the bearing direction of a signal transmission means from which signals are received.
9. A surveillance alarm system as claimed in claim 3 wherein said body proximity detection means comprises a heat sensor formed and arranged for detecting a change in temperature sensed by said sensor upon removal of said sensor from the body.
10. A method of surveillance of children within a predetermined area comprising the steps of: providing a surveillance alarm system of the invention for surveillance of a predetermined zone corresponding substantially to said predetermined area; attaching a portable signal transmission means thereof to a child; and monitoring the output of the alarm signal output means of the base station of said alarm system.
11. A surveillance alarm system substantially as described hereinbefore with particular reference to
Figs. 1 to 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9020986A GB2248331A (en) | 1990-09-26 | 1990-09-26 | Surveillance alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9020986A GB2248331A (en) | 1990-09-26 | 1990-09-26 | Surveillance alarm system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9020986D0 GB9020986D0 (en) | 1990-11-07 |
| GB2248331A true GB2248331A (en) | 1992-04-01 |
Family
ID=10682801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9020986A Withdrawn GB2248331A (en) | 1990-09-26 | 1990-09-26 | Surveillance alarm system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2248331A (en) |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993025983A1 (en) * | 1992-06-16 | 1993-12-23 | Kuehnert Eduard | Method and device for the protection of people or objects |
| GB2275804A (en) * | 1993-03-06 | 1994-09-07 | Manjit Singh Bains | Child alarm/monitor |
| GB2276479A (en) * | 1993-03-23 | 1994-09-28 | Jason Mager Robert Macwhirter | Anti-loss alarm system |
| WO1995002874A1 (en) * | 1993-07-15 | 1995-01-26 | Girolamo Buonavoglia | Electronic device for continuous, or discontinuous, connection between persons and objects |
| EP0838908A2 (en) * | 1996-10-23 | 1998-04-29 | Nokia Mobile Phones Ltd. | Radiotelephone proximity detector |
| GB2318671A (en) * | 1996-10-23 | 1998-04-29 | Nokia Mobile Phones Ltd | Radiotelephone proximity detector |
| GB2319872A (en) * | 1996-11-30 | 1998-06-03 | Neil Sharp | Child safety system |
| GB2326549A (en) * | 1997-05-08 | 1998-12-23 | Rajab Ali Zafari | Child tracker |
| GB2333876A (en) * | 1998-02-02 | 1999-08-04 | Anthony John Hulbert | Mobile range sensitive security device |
| WO1999045498A1 (en) * | 1998-03-02 | 1999-09-10 | Konisa Limited | Monitoring system |
| GB2335774A (en) * | 1998-03-24 | 1999-09-29 | Dale Bolton | Child safety distance monitor |
| FR2783955A1 (en) * | 1998-09-25 | 2000-03-31 | Richard Hamon | Master/slave transmitter/receiver set object/person absence alerting having slave retransmitting coded transmissions and master detecting signal absence/sounding alarm. |
| WO2000019802A2 (en) * | 1999-12-27 | 2000-04-13 | Hpm International Trade Ag | Surveillance and security system |
| GB2343776A (en) * | 1998-11-10 | 2000-05-17 | Sally Jane Kimmis | Child safety distance alarm system |
| GB2345782A (en) * | 1999-01-15 | 2000-07-19 | Koopal Farshid | Electronic tracing system |
| EP1076322A2 (en) * | 1999-08-12 | 2001-02-14 | Koji Nakamura | Audio reporting apparatus for wanderer detection, article-losing prevention, etc. |
| WO2003007257A1 (en) * | 2001-07-13 | 2003-01-23 | Juan Carlos Cordoba | An alarm system for a portable device |
| US6512457B2 (en) | 1999-11-15 | 2003-01-28 | Hector Irizarry | Monitoring device adapted for use with an electronic article surveillance system |
| WO2003030118A2 (en) * | 2001-09-28 | 2003-04-10 | Seatsignal, Inc. | Object-proximity monitoring and alarm system |
| GB2402827A (en) * | 2003-06-03 | 2004-12-15 | Ashgill Electronics Ltd | Child monitoring system |
| US7009522B2 (en) | 2001-09-28 | 2006-03-07 | Seatsignal, Inc. | Object-proximity monitoring and alarm system |
| WO2007080489A1 (en) * | 2006-01-10 | 2007-07-19 | Ercole Bonini | Device for checking the presence of persons in a circumscribed area |
| US8493226B2 (en) | 2010-08-30 | 2013-07-23 | Brian Tedesco | Battery charger loss prevention adaptor having a notification module |
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|---|---|---|---|---|
| GB2112600A (en) * | 1981-09-02 | 1983-07-20 | Kunwar Chander Jeet Singh | Out of proximity alarm system |
| EP0093463A1 (en) * | 1982-04-29 | 1983-11-09 | Michael Givaty | System, method and apparatus for protecting objects, individuals and entities |
| US4593273A (en) * | 1984-03-16 | 1986-06-03 | Narcisse Bernadine O | Out-of-range personnel monitor and alarm |
| GB2182183A (en) * | 1985-10-26 | 1987-05-07 | Robert Peter Andow | Child vicinity radio alarm system |
| EP0323041A2 (en) * | 1987-12-07 | 1989-07-05 | Barry M. Wolk | Infant security system |
| GB2214340A (en) * | 1988-01-08 | 1989-08-31 | Jeffrey Kear | Lost or stolen property warning device |
| GB2218245A (en) * | 1988-05-03 | 1989-11-08 | Shorrock Ltd | Radio tag alarm system |
| GB2218553A (en) * | 1988-05-13 | 1989-11-15 | Philip Malcolm Grange Dick | Security system |
-
1990
- 1990-09-26 GB GB9020986A patent/GB2248331A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2112600A (en) * | 1981-09-02 | 1983-07-20 | Kunwar Chander Jeet Singh | Out of proximity alarm system |
| EP0093463A1 (en) * | 1982-04-29 | 1983-11-09 | Michael Givaty | System, method and apparatus for protecting objects, individuals and entities |
| US4593273A (en) * | 1984-03-16 | 1986-06-03 | Narcisse Bernadine O | Out-of-range personnel monitor and alarm |
| GB2182183A (en) * | 1985-10-26 | 1987-05-07 | Robert Peter Andow | Child vicinity radio alarm system |
| EP0323041A2 (en) * | 1987-12-07 | 1989-07-05 | Barry M. Wolk | Infant security system |
| GB2214340A (en) * | 1988-01-08 | 1989-08-31 | Jeffrey Kear | Lost or stolen property warning device |
| GB2218245A (en) * | 1988-05-03 | 1989-11-08 | Shorrock Ltd | Radio tag alarm system |
| GB2218553A (en) * | 1988-05-13 | 1989-11-15 | Philip Malcolm Grange Dick | Security system |
Cited By (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993025983A1 (en) * | 1992-06-16 | 1993-12-23 | Kuehnert Eduard | Method and device for the protection of people or objects |
| US5552773A (en) * | 1992-06-16 | 1996-09-03 | K+E,Uml U+Ee Hnert; Eduard | Method and apparatus for the protection of people or objects |
| GB2275804A (en) * | 1993-03-06 | 1994-09-07 | Manjit Singh Bains | Child alarm/monitor |
| GB2276479A (en) * | 1993-03-23 | 1994-09-28 | Jason Mager Robert Macwhirter | Anti-loss alarm system |
| WO1995002874A1 (en) * | 1993-07-15 | 1995-01-26 | Girolamo Buonavoglia | Electronic device for continuous, or discontinuous, connection between persons and objects |
| EP0838908A3 (en) * | 1996-10-23 | 2000-02-23 | Nokia Mobile Phones Ltd. | Radiotelephone proximity detector |
| GB2318671A (en) * | 1996-10-23 | 1998-04-29 | Nokia Mobile Phones Ltd | Radiotelephone proximity detector |
| EP0838908A2 (en) * | 1996-10-23 | 1998-04-29 | Nokia Mobile Phones Ltd. | Radiotelephone proximity detector |
| GB2319872A (en) * | 1996-11-30 | 1998-06-03 | Neil Sharp | Child safety system |
| GB2326549A (en) * | 1997-05-08 | 1998-12-23 | Rajab Ali Zafari | Child tracker |
| GB2333876A (en) * | 1998-02-02 | 1999-08-04 | Anthony John Hulbert | Mobile range sensitive security device |
| WO1999045498A1 (en) * | 1998-03-02 | 1999-09-10 | Konisa Limited | Monitoring system |
| US6232877B1 (en) | 1998-03-02 | 2001-05-15 | Konisa Limited | Security system |
| GB2335774A (en) * | 1998-03-24 | 1999-09-29 | Dale Bolton | Child safety distance monitor |
| FR2783955A1 (en) * | 1998-09-25 | 2000-03-31 | Richard Hamon | Master/slave transmitter/receiver set object/person absence alerting having slave retransmitting coded transmissions and master detecting signal absence/sounding alarm. |
| GB2343776A (en) * | 1998-11-10 | 2000-05-17 | Sally Jane Kimmis | Child safety distance alarm system |
| GB2345782A (en) * | 1999-01-15 | 2000-07-19 | Koopal Farshid | Electronic tracing system |
| GB2345782B (en) * | 1999-01-15 | 2002-12-31 | Koopal Farshid | Electronic tracing system |
| EP1076322A2 (en) * | 1999-08-12 | 2001-02-14 | Koji Nakamura | Audio reporting apparatus for wanderer detection, article-losing prevention, etc. |
| EP1076322A3 (en) * | 1999-08-12 | 2002-03-27 | Koji Nakamura | Audio reporting apparatus for wanderer detection, article-losing prevention, etc. |
| US6512457B2 (en) | 1999-11-15 | 2003-01-28 | Hector Irizarry | Monitoring device adapted for use with an electronic article surveillance system |
| WO2000019802A2 (en) * | 1999-12-27 | 2000-04-13 | Hpm International Trade Ag | Surveillance and security system |
| WO2000019802A3 (en) * | 1999-12-27 | 2000-11-09 | Hpm Internat Trade Ag | Surveillance and security system |
| US7009512B2 (en) | 2001-07-13 | 2006-03-07 | Juan Carlos Cordoba | Alarm system for a portable device |
| WO2003007257A1 (en) * | 2001-07-13 | 2003-01-23 | Juan Carlos Cordoba | An alarm system for a portable device |
| WO2003030118A2 (en) * | 2001-09-28 | 2003-04-10 | Seatsignal, Inc. | Object-proximity monitoring and alarm system |
| WO2003030118A3 (en) * | 2001-09-28 | 2004-03-11 | Seatsignal Inc | Object-proximity monitoring and alarm system |
| US6847302B2 (en) | 2001-09-28 | 2005-01-25 | Seatsignal, Inc. | Object-proximity monitoring and alarm system |
| US7009522B2 (en) | 2001-09-28 | 2006-03-07 | Seatsignal, Inc. | Object-proximity monitoring and alarm system |
| GB2402827A (en) * | 2003-06-03 | 2004-12-15 | Ashgill Electronics Ltd | Child monitoring system |
| WO2007080489A1 (en) * | 2006-01-10 | 2007-07-19 | Ercole Bonini | Device for checking the presence of persons in a circumscribed area |
| US8493226B2 (en) | 2010-08-30 | 2013-07-23 | Brian Tedesco | Battery charger loss prevention adaptor having a notification module |
| US9019103B2 (en) | 2010-08-30 | 2015-04-28 | Brian Tedesco | Charger loss prevention adaptor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9020986D0 (en) | 1990-11-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |