GB2314986A - Electronic child protection system - Google Patents
Electronic child protection system Download PDFInfo
- Publication number
- GB2314986A GB2314986A GB9713457A GB9713457A GB2314986A GB 2314986 A GB2314986 A GB 2314986A GB 9713457 A GB9713457 A GB 9713457A GB 9713457 A GB9713457 A GB 9713457A GB 2314986 A GB2314986 A GB 2314986A
- Authority
- GB
- United Kingdom
- Prior art keywords
- child
- parent
- alarm
- portable electronic
- security system
- 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- Withdrawn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
- 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
- G08B21/0222—Message structure or message content, e.g. message protocol
-
- 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
- G08B21/0227—System arrangements with a plurality of child units
-
- 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
- G08B21/0263—System arrangements wherein the object is to detect the direction in which child or item is located
-
- 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
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
- G08B21/0288—Attachment of child unit to child/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
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
- G08B21/0294—Display details on parent unit
-
- 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
- G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
- G01S13/825—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted with exchange of information between interrogator and responder
-
- 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/04—Display arrangements
- G01S7/06—Cathode-ray tube displays or other two dimensional or three-dimensional displays
Abstract
An electronic child protection system, has a parent device (1) and one or more child devices (2) to comprise a system which provides a means of monitoring the distance and direction between devices and provide appropriate alarms for protection against unwanted straying or abduction. The child devices (2) are securably fixed to the child's clothing (8) or around the wrist/ankle (5), the fixing mechanisms (6,10) being monitored and providing for an alarm when any attempt is made to remove the device. Measurement of distance is by way of two way communication (3) and electronic calculation using phase difference of radio wave signals. The communication signals are coded and contain intelligent information for communication of alarm conditions and/or messages. Other applications are possible.
Description
FAIL SAFE ELECTRONIC CHILD PROTECTION SYSTEM
This invention relates to an electronic child protection system.
Existing child monitoring systems utilise a transmitter device, worn by the child, and a receiver device held by the guardian. Typical systems transmit a single way analogue signal which attenuates with distance and an alarm is raised when the attenuation falls to below preset limits. There are a number of problems with such systems. Firstly, because the transmission signal can also be attenuated by travelling through walls, climatic conditions etc. and is affected by weak batteries in the child device, this leads to spurious and inaccurate alarms. Secondly, if the transmitter device is removed from the child, the healthy transmissions signals continue indefinitely giving a false sense of security to the guardian.
This invention aims to provide a fail-safe, reliable and accurate system to protect against the abduction or unwanted straying of children. It may also be adapted for other uses as suggested, but not limited to, those listed at the end of the description.
According to the present invention there is provided a portable electronic child security system comprising a parent transceiver device and one or more child transceiver devices, the parent device transmitting an electronically modified radio signal to the child device(s), the child device(s) sending a return signal in reply, the radio signals between the parent and child devices being modified by way of frequency modulation and/or amplitude modulation using phase or time to facilitate calculation of distance between parent and child device(s), the child device(s) having a securable fixing means for securably fixing to clothing or around wrist/ankle using optional clip or strap, the securable fixing means having an in-built mechanism and/or properties monitored by the child device to signify removal thereof from the child and so force an alarm state recognisable by the parent device, means for issuing an appropriate alarm from the parent device when a child device is outside acceptable range or an alarm signal is issued from the child device or when the parent device fails to receive return signals from the child device or when the child device returns an erroneous signal.
An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawings in which:
Figure 1 illustrates the communication between parent and child devices;
Figure 2 illustrates the parent device physical characteristics;
Figure 3 illustrates the child device mounted on child's wrist;
Figure 4 illustrates the child device clipped on child's clothing;
Figure 5 illustrates rear view of the child device showing connection for strap or clip mechanisms;
Figure 6 illustrates the strap assembly for the child device;
Figure 7 illustrates the clip assembly for the child device;
Figure 8 illustrates the radio wave shield mechanism;
Figure 9 illustrates the parent device docking station;
Figure 10 illustrates a flow diagram for the parent device;
Figure 11 illustrates a flow diagram for the child device.
Referring to the drawings, the invention provides for two separate devices, a base station, hereafter referred-to as the parent device 1 and a remote transceiver, hereafter referred to as the child device 2. Both devices are used together to form a "system". The parent device 1 is a wireless transmitter/receiver (transceiver) and is effectively a monitoring and alarm station. The child device 2 is a separate wireless transceiver device to be worn by a child. A single parent device 1 may be suitable for simultaneous operation with one or more child devices 2. The system may provide an alarm either when a child device 2 is outside of the desired/acceptable distance from the parent device 1 or when triggered by a "help" signal from a child device 2 denoting either unauthorised removal of the child device 2 from the child or activation of a help button on the child device 2. The parent device 1 and child device 2 may be made sufficiently small and mobile to allow protection whilst on the move e.g. providing protection whilst on a shopping trip or outing and will be battery powered.
The parent device 1 will, at regular intervals transmit a wireless signal to the child device 2.
This signal will be referred to as the 'call' signal. After a 'call' signal is sent, the parent device 1 will start timing until a 'reply' signal is received from the child device 2 or until a predetermined time has elapsed. The 'call' and 'reply' signals may be coded with the identity of the child device 2 in order to avoid interference with extraneous devices.
On receipt of the reply signal within the pre-determined time, the parent device 1 will then transmit a sequence of three or more 'measurement wave' signals 3. Each of the transmitted signals in this sequence will be suitably modified such that each of the signals within the sequence is unique e.g. modified by way of frequency change. Each of the signals in this sequence will be received by the child device 2 and will then be re-transmitted, i.e. reflected, back to the parent device 1. For each measurement wave signal transmitted and received, the phase difference will be measured and stored. By use of simultaneous equations, the parent device 1 will resolve the ambiguity of the phase differences and calculate the distance between parent and child devices 1,2.
Failure of the parent device 1 to receive return communications from the child device 2, may prompt a number of successive re-attempts before entering any alarm conditions. Failure to receive return communications after successive re-attempts or the calculated distance being greater than that desired will result in an alarm state. The parent device 1 will incorporate means by which the desired alarm distance can be set by the user. The parent device 1 may include means by which the time of transmission of signals to the child device 2 can be altered when in conflict with extraneous devices operating within the locality.
The transmission signals between the parent device 1 and child device 2, either call & reply signals or measurement wave signals, may include additional encrypted information such as, but not limited to, "call" and "help" alerts as later described.
The parent device 1 may include a "call" button which when pressed will include encrypted information on the outgoing transmissions recognisable by the child device 2. When a child device 2 receives a call signal it will alert the child to the call request by suitable means such as an audible buzzer. The child device 2 may also include a "help" button which when pressed will include encrypted information on the return transmissions. When the parent device 1 receives a help signal it will enter an alarm state. Any such help button may be disabled by the parent if so desired. The child device may also recognise other encrypted information from the parent device transmissions. For example, a "warn" signal may be included to give the child a warning of when he or she is approaching the alarm distance set at the parent device e.g. by way of an intermittent beeping, thus giving the child an opportunity to avoid straying further and additionally providing a warning to abductors that the child is wearing an alarm.
During normal operation there is, therefore, a continuous two-way communication between the parent device 1 and the child device 2. The period of time between sending the 'call' signal and receiving the 'reply' signal may be a fraction of one second.
When in an alarm state the parent device 1 will provide a means of alerting the parent to the alarm condition such as, but not limited to, an audible alarm. Any such alert will continue until the keeper of the parent device 1 'accepts' the alarm. A suitable means of accepting an alarm may be, but not limited to, an 'Accept' push-button at the parent device 1. During an alarm state, however, the communication between parent device 1 and child device 2 may continue.
The parent device 1 may include a display 4 which may include information such as distance to child device, alarm status, alarm description i.e. range alarm or help alarm, time of day, battery condition etc. The parent device 1 may also include a sliding radio shield mechanism 11 as shown in figure 8. When this shield mechanism 11 is pushed into place the parent device 1 will only receive return communications from a narrow acceptance angle to provide a means of determining the direction of the child device 2. When combined with the distance display information this will enable the holder of the parent device 1 to determine the approximate location of the child.
A separate docking station 12 may also be provided as shown in Figure 9. This may permit the parent device 1 to be docked in order to provide facilities such as mains operation, battery recharge, audible load alarm sounder etc. for when the parent is not on the move i.e. at home.
A key feature of this invention is that the child device 2 will incorporate a special "fail safe" fixing mechanism. The fixing mechanism will have an appropriate physical property which is continuously monitored by the child device 2 circuitry. The fixing mechanism may be in the form of a strap 6 to be fixed around the child's wrist 5 or alternatively a clip 10 which would fix the child device 2 to the child's clothing 8. The child device 2 may include the facility to change between strap 6 or clip 10 fixings to suit the application and/or age of the child by way of fixing attachment mechanism 9. Figures 5 and 6 and 7 show the child device 2 and fixings by way of example only. Any attempt to remove the strap 6 or clip 10 from the child will result in a change of the physical property which may include, but not limited to, a change in resistance, change in capacitance, change in conductivity etc. Any such change will be detectable by the child device 2 which in turn will initiate an alarm state. This alarm state will be communicated to the parent device 1 either by way of inhibiting the reply or reflected signals or by encrypting the alarm state information into the return signals. The parent device 1 will then enter it's own alarm state as previously described.
The child device 2 may include the facility to transmit a distress signal when in an alarm state or when instructed by the parent device. This option may facilitate in a search process when location finding from the parent device 1 is impracticable or impossible. The child device 2 may also include a display for information such as alarm status, time, battery condition and other alert information e.g. "COME HOME" or "TOO FAR"
The child device 2 will return to normal operation only when the condition of the fixing mechanism 6,10 is healthy and when any alarms have been accepted at the parent device 1 and when the child device 2 is within the set alarm distance.
Since the system relies upon a continuous communication between the parent device land child device 2 an alarm mode will be initiated when the child device 2;
is out of the pre-set range is out of the signal operating range/fails to respond
initiates an alarm mode either due to unauthorised removal, tampering, device failure or
manual operation.
Unless the child device 2 operates exactly as defined, the system has been deemed to be in an error mode, and has thus 'failed safe.'
This system may be adapted for other applications such as
Hospital Ward Security
Offender House Arrest
Anti Straying of Pets & Livestock
The key advantages of this system include
Easily variable protected distance setting at the parent device 1
Transportable parent device allows a 'moving' protection zone . Detection of unauthorised transceiver removal
Fail safe two way operation
Distance measurement unaffected by local obstacles which attenuate radio signals Ability to provide some immunity to other devices operating within the vicinity Software control allows system to be adapted to work with more than one child device 2.
Claims (13)
1. A portable electronic child security system comprising a parent transceiver device and
one or more child transceiver devices, the parent device transmitting an electronically
modified radio signal to the child device(s), the child device(s) sending a return signal in
reply, the radio signals between the parent and child devices being modified by way of
frequency modulation and/or amplitude modulation using phase or time to facilitate
calculation of distance between parent and child device(s), the child device(s) having a
securable fixing means for securably fixing to clothing or around wrist/ankle using
optional clip or strap, the securable fixing means having an in-built mechanism and/or
properties monitored by the child device to signify removal thereof from the child and so
force an alarm state recognisable by the parent device, means for issuing an appropriate
alarm from the parent device when a child device is outside acceptable range or an alarm
signal is issued from the child device or when the parent device fails to receive return
signals from the child device or when the child device returns an erroneous signal.
2. A portable electronic child security system as claimed in Claim 1, wherein the outgoing
and return radio signals are encrypted with a unique code to facilitate communication
between one or more child devices from a single parent device and to avoid interfering
communication with extraneous devices operating within the locality.
3. A portable electronic child security system as claimed in Claim 1 or Claim 2, wherein
failure of the parent device to receive an appropriate reply signal will prompt a number of
successive re-attempts for a period of time before issuing an alarm.
4. A portable electronic child security system as claimed in Claim 2 or Claim 3, wherein the
time of transmission of radio signals is altered when in conflict with extraneous devices
operating within the locality.
5. A portable electronic child security system as claimed in Claim 4 wherein the parent
device includes a sliding radio shield mechanism to control the angle of acceptance of
return radio signals to provide a means of determining the direction of the child device(s).
6. A portable electronic child security system as claimed in Claim 5, wherein the parent
device provides means to set the alarm distance manually or by selection of pre-set
distance settings.
7. A portable electronic child security system as claimed in Claim 6, wherein the parent
device includes a display providing information including distance, alarm status and time
of day.
8. A portable electronic child security system as claimed in Claim 7, wherein the parent
device can be connected into a separate docking station which will provide for recharging
of the parent device batteries, mains operation and audible alarm sounder.
9. A portable electronic child security system as claimed in Claim 8, wherein parent device
provides a 'call' facility by way of a push button which when pressed includes
information on the outgoing radio signal uniquely matched to the child device(s).
10. A portable electronic child security system as claimed in any preceding claim, wherein
the child device(s) provide an alarm to the wearer when in receipt of an appropriate 'call'
signal.
11. A portable electronic child security system as claimed in Claim 10, wherein child device
provides means to initiate a distress alarm detectable by the parent device.
12. A portable electronic child security system as claimed in Claim 11, wherein child device
provides a display showing time of day and/or other status information.
13. A portable electronic child security system substantially as herein described with
reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9713457A GB2314986A (en) | 1996-07-02 | 1997-06-26 | Electronic child protection system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9613839.1A GB9613839D0 (en) | 1996-07-02 | 1996-07-02 | Electronic child protection system |
| GB9713457A GB2314986A (en) | 1996-07-02 | 1997-06-26 | Electronic child protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9713457D0 GB9713457D0 (en) | 1997-09-03 |
| GB2314986A true GB2314986A (en) | 1998-01-14 |
Family
ID=26309615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9713457A Withdrawn GB2314986A (en) | 1996-07-02 | 1997-06-26 | Electronic child protection system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2314986A (en) |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0969435A2 (en) * | 1998-06-23 | 2000-01-05 | Raj Kumar Dhameja | Personal tracking system predominantly for children |
| 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. |
| WO2000019235A1 (en) * | 1998-09-28 | 2000-04-06 | Tagtec Limited | Rfid detection system |
| WO2001009856A1 (en) * | 1999-07-30 | 2001-02-08 | Lexent Technologies, Inc. | System and method for monitoring spatial relationship between mobile objects |
| GB2355565A (en) * | 1999-07-27 | 2001-04-25 | Activerf Ltd | Security system for multiple units |
| WO2001091077A1 (en) * | 2000-05-26 | 2001-11-29 | Bernhard Koblischeck | Safety system for automatically determining the position of objects |
| WO2001095278A1 (en) * | 2000-06-02 | 2001-12-13 | Janice Glover | Location system |
| FR2813422A1 (en) * | 2000-08-29 | 2002-03-01 | Monique Mouroux | Alarm system for children has bracelet transmitter to mobile phone with vibration signal |
| GB2368704A (en) * | 2000-08-24 | 2002-05-08 | Robert Thomas Kingsbury | Wireless child distance monitoring alarm system with anti-tamper features |
| NL1018000C2 (en) * | 2001-01-08 | 2002-07-09 | Wilhelmus Bults | Transceiver, used for monitoring child, activates emergency signal if radiographic link between transceiver and responder is broken |
| NL1017420C2 (en) * | 2001-02-21 | 2002-08-22 | Gerrit Hendrikus Johannes Vos | System for remote accessing of design and maintenance data about houses, apartments and other buildings, allows central station to interrogate databases at storage facility |
| GB2375424A (en) * | 2001-05-08 | 2002-11-13 | Lee Stephen Duffett | Personal items protection alarm |
| GB2380588A (en) * | 2001-10-04 | 2003-04-09 | Christopher Brearley | Security device triggered in response to displacement |
| GB2381363A (en) * | 2001-10-25 | 2003-04-30 | Paul Clarke | Distance monitoring alarm and locating device |
| GB2389945A (en) * | 2002-06-20 | 2003-12-24 | John Edward Hallam | Article loss detection system |
| WO2004019297A1 (en) * | 2002-08-20 | 2004-03-04 | Schaefer Micheal | Personal locating and protection device and method |
| GB2399670A (en) * | 2003-03-15 | 2004-09-22 | Gary Wallis | Child's distance monitor alarm |
| GB2400711A (en) * | 2003-04-16 | 2004-10-20 | Paul Thomas Dimmer | Wireless alarm system monitoring the position of valuables that is suitable for protecting computers or mobile phones which are using wireless data networks |
| GB2421619A (en) * | 2004-12-09 | 2006-06-28 | Dean John William Corrigan | Child monitoring system |
| AT414178B (en) * | 2003-05-05 | 2006-09-15 | Werner Dipl Ing Dietrich | METHOD AND DEVICE FOR MARKING DISTANCE LIMITS |
| GB2435535A (en) * | 2006-02-08 | 2007-08-29 | Lennard Mervin | Separation alarm for monitoring the distance from a guardian to a child or pet. |
| JP2015531054A (en) * | 2012-07-06 | 2015-10-29 | ニダ テック スウェーデン エービー | Method, node and computer program for device location confirmation |
| WO2016203074A1 (en) * | 2015-06-18 | 2016-12-22 | López Coll Antonio | Garment for secure monitoring |
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|---|---|---|---|---|
| EP0323041A2 (en) * | 1987-12-07 | 1989-07-05 | Barry M. Wolk | Infant security system |
| GB2246891A (en) * | 1990-04-27 | 1992-02-12 | Arrowaxe Ltd | Alarm system |
| WO1993019437A1 (en) * | 1992-03-24 | 1993-09-30 | A & H International, Inc. | Child monitoring apparatus |
| US5289163A (en) * | 1992-09-16 | 1994-02-22 | Perez Carla D | Child position monitoring and locating device |
| US5512879A (en) * | 1994-07-25 | 1996-04-30 | Stokes; John H. | Apparatus to prevent infant kidnappings and mixups |
| US5525967A (en) * | 1993-11-01 | 1996-06-11 | Azizi; S. Massoud | System and method for tracking and locating an object |
| WO1996018913A1 (en) * | 1994-12-13 | 1996-06-20 | Secure Technologies, Inc. | Distance determination and alarm system |
-
1997
- 1997-06-26 GB GB9713457A patent/GB2314986A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0323041A2 (en) * | 1987-12-07 | 1989-07-05 | Barry M. Wolk | Infant security system |
| GB2246891A (en) * | 1990-04-27 | 1992-02-12 | Arrowaxe Ltd | Alarm system |
| WO1993019437A1 (en) * | 1992-03-24 | 1993-09-30 | A & H International, Inc. | Child monitoring apparatus |
| US5289163A (en) * | 1992-09-16 | 1994-02-22 | Perez Carla D | Child position monitoring and locating device |
| US5525967A (en) * | 1993-11-01 | 1996-06-11 | Azizi; S. Massoud | System and method for tracking and locating an object |
| US5512879A (en) * | 1994-07-25 | 1996-04-30 | Stokes; John H. | Apparatus to prevent infant kidnappings and mixups |
| WO1996018913A1 (en) * | 1994-12-13 | 1996-06-20 | Secure Technologies, Inc. | Distance determination and alarm system |
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0969435A3 (en) * | 1998-06-23 | 2000-05-17 | Raj Kumar Dhameja | Personal tracking system predominantly for children |
| EP0969435A2 (en) * | 1998-06-23 | 2000-01-05 | Raj Kumar Dhameja | Personal tracking system predominantly for children |
| 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. |
| WO2000019235A1 (en) * | 1998-09-28 | 2000-04-06 | Tagtec Limited | Rfid detection system |
| GB2355565B (en) * | 1999-07-27 | 2002-10-09 | Activerf Ltd | Improvements relating to security |
| GB2355565A (en) * | 1999-07-27 | 2001-04-25 | Activerf Ltd | Security system for multiple units |
| WO2001009856A1 (en) * | 1999-07-30 | 2001-02-08 | Lexent Technologies, Inc. | System and method for monitoring spatial relationship between mobile objects |
| WO2001091077A1 (en) * | 2000-05-26 | 2001-11-29 | Bernhard Koblischeck | Safety system for automatically determining the position of objects |
| WO2001095278A1 (en) * | 2000-06-02 | 2001-12-13 | Janice Glover | Location system |
| GB2368704A (en) * | 2000-08-24 | 2002-05-08 | Robert Thomas Kingsbury | Wireless child distance monitoring alarm system with anti-tamper features |
| FR2813422A1 (en) * | 2000-08-29 | 2002-03-01 | Monique Mouroux | Alarm system for children has bracelet transmitter to mobile phone with vibration signal |
| NL1018000C2 (en) * | 2001-01-08 | 2002-07-09 | Wilhelmus Bults | Transceiver, used for monitoring child, activates emergency signal if radiographic link between transceiver and responder is broken |
| NL1017420C2 (en) * | 2001-02-21 | 2002-08-22 | Gerrit Hendrikus Johannes Vos | System for remote accessing of design and maintenance data about houses, apartments and other buildings, allows central station to interrogate databases at storage facility |
| GB2375424A (en) * | 2001-05-08 | 2002-11-13 | Lee Stephen Duffett | Personal items protection alarm |
| GB2380588A (en) * | 2001-10-04 | 2003-04-09 | Christopher Brearley | Security device triggered in response to displacement |
| GB2381363A (en) * | 2001-10-25 | 2003-04-30 | Paul Clarke | Distance monitoring alarm and locating device |
| GB2389945A (en) * | 2002-06-20 | 2003-12-24 | John Edward Hallam | Article loss detection system |
| WO2004019297A1 (en) * | 2002-08-20 | 2004-03-04 | Schaefer Micheal | Personal locating and protection device and method |
| GB2399670A (en) * | 2003-03-15 | 2004-09-22 | Gary Wallis | Child's distance monitor alarm |
| GB2400711A (en) * | 2003-04-16 | 2004-10-20 | Paul Thomas Dimmer | Wireless alarm system monitoring the position of valuables that is suitable for protecting computers or mobile phones which are using wireless data networks |
| AT414178B (en) * | 2003-05-05 | 2006-09-15 | Werner Dipl Ing Dietrich | METHOD AND DEVICE FOR MARKING DISTANCE LIMITS |
| GB2421619A (en) * | 2004-12-09 | 2006-06-28 | Dean John William Corrigan | Child monitoring system |
| GB2421619B (en) * | 2004-12-09 | 2009-12-23 | Dean John William Corrigan | A communications system |
| GB2435535A (en) * | 2006-02-08 | 2007-08-29 | Lennard Mervin | Separation alarm for monitoring the distance from a guardian to a child or pet. |
| JP2015531054A (en) * | 2012-07-06 | 2015-10-29 | ニダ テック スウェーデン エービー | Method, node and computer program for device location confirmation |
| WO2016203074A1 (en) * | 2015-06-18 | 2016-12-22 | López Coll Antonio | Garment for secure monitoring |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9713457D0 (en) | 1997-09-03 |
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| Date | Code | Title | Description |
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| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |