EP0093463A1 - System, method and apparatus for protecting objects, individuals and entities - Google Patents
System, method and apparatus for protecting objects, individuals and entities Download PDFInfo
- Publication number
- EP0093463A1 EP0093463A1 EP83200508A EP83200508A EP0093463A1 EP 0093463 A1 EP0093463 A1 EP 0093463A1 EP 83200508 A EP83200508 A EP 83200508A EP 83200508 A EP83200508 A EP 83200508A EP 0093463 A1 EP0093463 A1 EP 0093463A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- receiver
- signal energy
- wireless
- energy
- wireless transmitter
- 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- Withdrawn
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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
- G08B21/04—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons
- G08B21/0438—Sensor means for detecting
- G08B21/0469—Presence detectors to detect unsafe condition, e.g. infrared sensor, microphone
-
- 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
- G08B21/04—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons
- G08B21/0438—Sensor means for detecting
- G08B21/0484—Arrangements monitoring consumption of a utility or use of an appliance which consumes a utility to detect unsafe condition, e.g. metering of water, gas or electricity, use of taps, toilet flush, gas stove or electric kettle
Definitions
- the invention relates in general to a system, a method and an apparatus, for protecting objects, individuals and entities, such as human beings, live-stock and things, comprising transmitter means for sustained wireless transmission of energy waves.
- Protection systems, methods and apparatus of a type known in the art comprise a label to be attached to the object of surveillance and a transmitter means generating a magnetic field at any exit port of an area under surveillance, said label carrying a device interacting with the local field caused by the transmitter means at an exit port, thus enabling an alarm device at said exit port. Only an object not having a label attached to it may leave said area freely, that is without raising an alarm signal.
- a further protection system, method and apparatus of a type known in the art fully covers the area under surveillance with electromagnetic radiation beamed across said area, and signals the presence of moving and/or stationary objects in that area indiscriminately with respect to their identity.
- a further objective of the invention is to provide a system, method and apparatus to effect in an unobtrusive way discrimination'of protected subjects in the area under surveillance.
- the invention relates to a wireless system for protecting objects, individuals and entities, such as human beings, live-stock and things.
- the said wireless protection system comprises a central station including wireless receiver means, and at least one mobile and portable subsidiary wireless transmission comprising a wireless transmitter means for transmitting signal energy, said wireless receiver means being adapted for sensing said transmitted signal energy and having a threshold means for rejecting any sensed signal at an energy level below an adjustable threshold level, a trigger means to be enabled by signal energy above threshold level and an alarm device to be activated by said trigger means.
- the invention is advantageous in that its implementation requires only little space, both at the transmitter end and at the receiver end. Its application is in particular satisfactory when providing a child at play with a subsidiary station means and its guardian with a central station means.
- a transmitter means generally indicated with the reference numeral 10 comprises a generating device 11 and an antenna device 12 being interconnected to have a sustained transmission of electromagnetic energy waves carrying such energy and such information as to enable identification, e.g. by transmitting continuous waves at one specific frequency.
- An on/off switching means (not shown) is comprised in said generating device 11 for activating same from an energy source (not shown).
- Said transmitter means 10 thus is self-contained and is comprised in a portable means, such as a trinket or a label, which can be attached to any carrier to be protected.
- a receiving station or central station generally indicated in the one figure with reference numeral 20 comprises a receiving antenna 21, a detecting and discriminating stage 22 to be tuned to the energy waves transmitted by transmitter means 10, a threshold adjustment means 23 comprising a variable potentiometer means, a relay coil 24 and a relay armature 25 under control of said coil 24 and adapted to close an interrupter 26 in a circuit further comprising an alarm device 27 and an energy supply means 28 to feed said alarm device.
- An electrical current output of threshold means 23 of sufficient intensity will thus cause the armature 25 to interrupt the alarm device circuit.
- Threshold adjustment means 23, relay coil 24 and relay armature 25 make up a threshold and trigger means in receiver means 20, and having an adjustable threshold level.
- alarm device 27 will be actuated when insufficiently receiving signal wave energy from transmitter means 10, that is below a level set in threshold adjustment means 23.
- the alarm device 27 will be actuated. Such a predetermined distance can be selected by adjustment of the level adjustment means 23.
- Fig. 2 shows a further embodiment of the wireless protection system according to the invention.
- a transmitter 32 is under control of a coder 31.
- a receiver 41 is arranged to receive coded signal energy from the transmitter 32. Decoding of the received signal energy in the receiver 41 produces by means of a pulse generator 42 sync pulses. The generated sync pulses are applied to an adjustable time delay means 44 and to one of two inputs of an AND gating means 47. The time delay means is adjusted to represent a time period in accordance with time lapsed in propagation of signal energy from transmitter to receiver if and when the transmitter is at a predetermined distance from the receiver.
- the selected adjustment starts from a zero setting representing synchronization between sync pulses and clock pulses from a clock 45 during an initiating time interval under control of a timing means 46 causing a normally open switch 51 to close and connect the delay means output to clock 45 during said initiating time interval.
- Clock 45 is operating at the same rate as the sync pulses generated in pulse generator 42.
- the clock pulses are applied to the further input of AND-gating means 47.
- the clock pulses will reach an accumulating device 48 only if they appear at AND-gating means 47 in synchronisation with the sync pulses.
- the setting of the number of clock pulses to be accumulated in accumulating device 48 for enabling alarm device 49 is operative as a threshold level.
- central station comprises a signal wave energy transmitting means and transity station comprises a receiving mean$ adapted to receive the thus transmitted signal wave energy.
- Fig. 3 shows a modification of a protection system embodiment according to Fig. 1.
- Central station 60 comprises a transmitter means 61 arranged to transmit pulse wise signal wave energy at predetermined time intervals.
- a receiver 51 at depoty station 50 is arranged to receive signal wave energy pulses transmitted by central station transmitter 61.
- the arrangement of receiver 51 is generally identical to the arrangement of the receiving means shown in Fig. 1 as included in central station 20.
- the embodiment shown in Fig. 3 is different in that alarm device 27 is used to enable transmitter 52 to transmit signal wave energy for a restricted period of time, preferably comprising two pulses as transmitted by central station 60.
- the arrangement of receiver 62 comprised in central station 60 also is identical to the arrangement of the receiving means shown in Fig. 1.
- infra red light wave energy or ultrasound wave energy is envisaged to provide such interconnection, primarily to avoid of interference.
- a central station may be equipped with alarm devices which are each being responsive to one of a plurality of subsidiary stations respectively to keep track of a plurality of individuals or entities to be protected.
- a central station comprising a receiver means and an alarm device may be conveniently comprised in a portable and self-contained package for versatile utilization.
Abstract
System, method and apparatus for protecting objets, individuals and entities, such as human beings, livestock and things, and in particular for protecting children at play. The system comprises a central station (20) and one or more mobile and portable subsidiary stations (10), each subsidiary station providing sustained transmission of energy waves and said central station comprising a receiver means (21, 22) having adjustable input sensitivity (23) and an alarm device (27) signalling insufficient input at the receiver means from said transmitted energy waves. Apparatus to be attached to a subject under surveillance may be embodied in a trinket sized package or as a labeling means.
Description
- The invention relates in general to a system, a method and an apparatus, for protecting objects, individuals and entities, such as human beings, live-stock and things, comprising transmitter means for sustained wireless transmission of energy waves.
- Protection systems, methods and apparatus of a type known in the art comprise a label to be attached to the object of surveillance and a transmitter means generating a magnetic field at any exit port of an area under surveillance, said label carrying a device interacting with the local field caused by the transmitter means at an exit port, thus enabling an alarm device at said exit port. Only an object not having a label attached to it may leave said area freely, that is without raising an alarm signal.
- A further protection system, method and apparatus of a type known in the art fully covers the area under surveillance with electromagnetic radiation beamed across said area, and signals the presence of moving and/or stationary objects in that area indiscriminately with respect to their identity.
- It is thus an object of the invention to provide a system, method and apparatus for protection, whereby the protected subject is unhampered as to its movements within the area under surveillance or when exiting said area.
- A further objective of the invention is to provide a system, method and apparatus to effect in an unobtrusive way discrimination'of protected subjects in the area under surveillance.
- The invention relates to a wireless system for protecting objects, individuals and entities, such as human beings, live-stock and things.
- According to the invention the said wireless protection system comprises a central station including wireless receiver means, and at least one mobile and portable subsidiary wireless transmission comprising a wireless transmitter means for transmitting signal energy, said wireless receiver means being adapted for sensing said transmitted signal energy and having a threshold means for rejecting any sensed signal at an energy level below an adjustable threshold level, a trigger means to be enabled by signal energy above threshold level and an alarm device to be activated by said trigger means.
- The invention is advantageous in that its implementation requires only little space, both at the transmitter end and at the receiver end. Its application is in particular satisfactory when providing a child at play with a subsidiary station means and its guardian with a central station means.
- The invention will be illustrated by way of example only in the following description of two embodiments.
-
- Fig. 1 in the accompanying drawing is a schematic diagram of a first embodiment according to the invention.
- Fig. 2 is a schematic diagram of a further embodiment according to the invention.
- Fig. 3 is a schematic diagram of a modification of the embodiment according to the invention shown in Fig. 1.
- In fig. 1 a transmitter means generally indicated with the
reference numeral 10 comprises a generatingdevice 11 and anantenna device 12 being interconnected to have a sustained transmission of electromagnetic energy waves carrying such energy and such information as to enable identification, e.g. by transmitting continuous waves at one specific frequency. An on/off switching means (not shown) is comprised in said generatingdevice 11 for activating same from an energy source (not shown). Said transmitter means 10 thus is self-contained and is comprised in a portable means, such as a trinket or a label, which can be attached to any carrier to be protected. - A receiving station or central station generally indicated in the one figure with
reference numeral 20 comprises a receivingantenna 21, a detecting anddiscriminating stage 22 to be tuned to the energy waves transmitted by transmitter means 10, a threshold adjustment means 23 comprising a variable potentiometer means, arelay coil 24 and arelay armature 25 under control of saidcoil 24 and adapted to close aninterrupter 26 in a circuit further comprising analarm device 27 and an energy supply means 28 to feed said alarm device. An electrical current output of threshold means 23 of sufficient intensity will thus cause thearmature 25 to interrupt the alarm device circuit. - Threshold adjustment means 23,
relay coil 24 andrelay armature 25 make up a threshold and trigger means in receiver means 20, and having an adjustable threshold level. - As a
result alarm device 27 will be actuated when insufficiently receiving signal wave energy from transmitter means 10, that is below a level set in threshold adjustment means 23. When and if transmitter means 10 is away from receiver means 20 beyond a predetermined distance, thealarm device 27 will be actuated. Such a predetermined distance can be selected by adjustment of the level adjustment means 23. - Fig. 2 shows a further embodiment of the wireless protection system according to the invention. In a subsidiary wireless station 30 a
transmitter 32 is under control of acoder 31. - In a central wireless station 40 a
receiver 41 is arranged to receive coded signal energy from thetransmitter 32. Decoding of the received signal energy in thereceiver 41 produces by means of apulse generator 42 sync pulses. The generated sync pulses are applied to an adjustable time delay means 44 and to one of two inputs of an AND gating means 47. The time delay means is adjusted to represent a time period in accordance with time lapsed in propagation of signal energy from transmitter to receiver if and when the transmitter is at a predetermined distance from the receiver. The selected adjustment starts from a zero setting representing synchronization between sync pulses and clock pulses from aclock 45 during an initiating time interval under control of a timing means 46 causing a normallyopen switch 51 to close and connect the delay means output toclock 45 during said initiating time interval. -
Clock 45 is operating at the same rate as the sync pulses generated inpulse generator 42. The clock pulses are applied to the further input of AND-gating means 47. The clock pulses will reach an accumulatingdevice 48 only if they appear at AND-gating means 47 in synchronisation with the sync pulses. - Clock pulses being accumulated in accumulating
device 48 will enable analarm device 49. - Thus at the point of time that the
subsidiary station 30 being carried by an object under surveillance, arrives in a position at the predetermined distance from thecentral station 40,alarm device 49 incentral station 40 will be activated. This means that the object under surveillance gets out of reach or is endangered. - In this embodiment the setting of the number of clock pulses to be accumulated in accumulating
device 48 for enablingalarm device 49 is operative as a threshold level. - Optionally central station comprises a signal wave energy transmitting means and secundary station comprises a receiving mean$ adapted to receive the thus transmitted signal wave energy. Fig. 3 shows a modification of a protection system embodiment according to Fig. 1.
Central station 60 comprises a transmitter means 61 arranged to transmit pulse wise signal wave energy at predetermined time intervals. Areceiver 51 atsecundary station 50 is arranged to receive signal wave energy pulses transmitted bycentral station transmitter 61. The arrangement ofreceiver 51 is generally identical to the arrangement of the receiving means shown in Fig. 1 as included incentral station 20. The embodiment shown in Fig. 3 is different in thatalarm device 27 is used to enabletransmitter 52 to transmit signal wave energy for a restricted period of time, preferably comprising two pulses as transmitted bycentral station 60. The arrangement ofreceiver 62 comprised incentral station 60 also is identical to the arrangement of the receiving means shown in Fig. 1. - Failure to receive signal wave energy at a level above threshold from
transmitter 52 inreceiver 62 will cause operation of the alarm device incentral station 60. - In the above the preferred embodiments have been described using electromagnetic waves to interconnect central station (receiver means) and subsidiary station (transmitter means).
- Use of infra red light wave energy or ultrasound wave energy is envisaged to provide such interconnection, primarily to avoid of interference.
- Also a central station may be equipped with alarm devices which are each being responsive to one of a plurality of subsidiary stations respectively to keep track of a plurality of individuals or entities to be protected. A central station comprising a receiver means and an alarm device may be conveniently comprised in a portable and self-contained package for versatile utilization.
Claims (9)
1. System for protecting objects, individuals and entities, such as human beings, live-stock and things, comprising a central station including wireless receiver means, and at least one mobile and portable subsidiary wireless transmission station for transmitting signal energy, said receiver means being adapted for sensing said transmitted signal energy and having a threshold means for rejecting any sensed signal at an energy level below an adjustable threshold level, a trigger means to be enabled by signal energy above threshold level and an alarm device to be activated by said trigger means.
2. Wireless protection system according to claim 1, characterized in that said central station receiver means comprises a decoding means deriving sync signal energy from received signal energy a clock means delivering clock pulses at the transmission rate of the said sync signals and comprising a synchronizing device, an initiating device for temporarily connecting sync signal energy output to said synchronizing device and comprising an adjustable time delay means for sync signal energy said threshold means comprising an AND gating means having an input for said clock pulses and an input for said sync signal energy, and said trigger means comprising an accumulating device for receiving clock pulses from said AND gating means.
3. Wireless protection system according to claim 1, characterized in that said central station comprises a central wireless transmitter means and a said subsidiary station comprises a receiver and trigger means to be enabled by said central wireless transmitter means and activating said signal energy transmitting wireless transmitter, said receiver and trigger means having an adjustable input sensitivity means.
4. Wireless protection system according to claim 1 or claim 2, characterized in that the said wireless transmitter means and receiver means each are adapted for sustained transmission of h.f. electromagnetic wave energy.
5. Wireless protection system according to claim 1 or claim 2, characterized in that the said wireless transmitter means and receiver means each are adapted for sustained transmission of infra red wave energy.
6. Wireless protection system according to claim 1 or claim 2, characterized in that the said wireless transmitter means and receiver means each are adapted for sustained transmission of ultrasonic wave energy.
7. A method for protecting individuals and entities, such as human beings, live-stock and things, comprising the steps of attaching a signal energy transmitter means to said individual or entity and adjusting a threshold level means in a central signal energy receiver means thus selecting a range wherein protection is provided.
8. An apparatus for protecting an individual or an entity, such as human beings, live-stock and things, comprising a mobile and portable wireless transmitter means being self-contained and operable through an on/off switching means and being packaged as a trinket or being trinket-sized.
9. An apparatus for protecting an individual or an entity, such as human beings, live-stock and things, comprising a mobile and portable wireless transmitter means being self-contained and operable through an on/off switching means and being packaged in a labeling device.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37323682A | 1982-04-29 | 1982-04-29 | |
US373236 | 1982-04-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0093463A1 true EP0093463A1 (en) | 1983-11-09 |
Family
ID=23471543
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83200508A Withdrawn EP0093463A1 (en) | 1982-04-29 | 1983-04-12 | System, method and apparatus for protecting objects, individuals and entities |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0093463A1 (en) |
JP (1) | JPS5927392A (en) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2182183A (en) * | 1985-10-26 | 1987-05-07 | Robert Peter Andow | Child vicinity radio alarm system |
EP0271787A2 (en) * | 1986-12-18 | 1988-06-22 | Selectronic Funk- und Sicherheitstechnik GmbH | Personal-protection radio apparatus |
GB2214340A (en) * | 1988-01-08 | 1989-08-31 | Jeffrey Kear | Lost or stolen property warning device |
GB2217084A (en) * | 1989-03-07 | 1989-10-18 | Mark Sillett | Personal security 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 |
GB2224146A (en) * | 1988-10-22 | 1990-04-25 | Roy Kenneth Hammond | Intruder alarm system |
DE4012074A1 (en) * | 1990-04-14 | 1991-10-17 | Meulen Alfred V D | Raid alarm worn on finger of operator - is actuated by pressure on concealed switch instigating PCM transmission from IR emitting diode |
GB2248331A (en) * | 1990-09-26 | 1992-04-01 | Harry Stuart Arfield | Surveillance alarm system |
GB2248330A (en) * | 1990-09-14 | 1992-04-01 | David William Seeman | Child/article monitoring system |
GB2275804A (en) * | 1993-03-06 | 1994-09-07 | Manjit Singh Bains | Child alarm/monitor |
GB2279170A (en) * | 1993-05-04 | 1994-12-21 | Trevor Newton | Electronic tagging system |
DE19528818A1 (en) * | 1995-08-05 | 1997-02-06 | Cordes Hans Theodor Dr | Method of securing objects, e.g. cases, vehicles, bicycles and even living beings - involves alarm device which emits signal when object is handled in unauthorised manner; signal is received by mobile receiver associated with a person which warns the person accordingly |
GB2350714A (en) * | 1999-06-01 | 2000-12-06 | Ronald Anderson Garden | Personal items alarm |
DE10153427A1 (en) * | 2001-10-30 | 2003-05-15 | Fritz Kutschera | Device for detecting movements has a sensor to detect infrared rays and an evaluating device connected to the sensor all in a common casing |
GB2389216A (en) * | 2002-05-30 | 2003-12-03 | Kenneth Dolman | Anti-theft or anti-loss proximity alarm |
GB2392537A (en) * | 2002-08-27 | 2004-03-03 | William Barrington Lawes | Distance monitoring alarm |
GB2398417A (en) * | 2003-02-12 | 2004-08-18 | John Williams | Personal property alarm system |
WO2006132745A1 (en) * | 2005-06-06 | 2006-12-14 | Lawrence Kates | System and method for variable threshold sensor |
US7669461B2 (en) | 2004-09-23 | 2010-03-02 | Lawrence Kates | System and method for utility metering and leak detection |
US7817031B2 (en) | 2004-05-27 | 2010-10-19 | Lawrence Kates | Wireless transceiver |
US8963726B2 (en) | 2004-05-27 | 2015-02-24 | Google Inc. | System and method for high-sensitivity sensor |
US10425877B2 (en) | 2005-07-01 | 2019-09-24 | Google Llc | Maintaining information facilitating deterministic network routing |
US10664792B2 (en) | 2008-05-16 | 2020-05-26 | Google Llc | Maintaining information facilitating deterministic network routing |
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DE2455259A1 (en) * | 1974-11-22 | 1976-05-26 | Roland Loebnau | Automatic warning of personal object anticipated loss - with small transmitter on the object which alerts a wrist watch mounted receiver and alarm |
CH589335A5 (en) * | 1974-02-13 | 1977-06-30 | Innovationsteknik Inst Ab | |
CH615522A5 (en) * | 1976-05-05 | 1980-01-31 | Walter Holzer | Method for monitoring the assignment of an object with respect to a particular person located near to the object, and device for carrying out the method and application of the method |
DE2837014A1 (en) * | 1978-08-24 | 1980-02-28 | Olympia Werke Ag | Device measuring distance between two movable objects - has sender and receiver coupled with objects and bar carrying ultrasonic oscillations |
-
1983
- 1983-04-12 EP EP83200508A patent/EP0093463A1/en not_active Withdrawn
- 1983-04-26 JP JP7229983A patent/JPS5927392A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CH589335A5 (en) * | 1974-02-13 | 1977-06-30 | Innovationsteknik Inst Ab | |
DE2455259A1 (en) * | 1974-11-22 | 1976-05-26 | Roland Loebnau | Automatic warning of personal object anticipated loss - with small transmitter on the object which alerts a wrist watch mounted receiver and alarm |
CH615522A5 (en) * | 1976-05-05 | 1980-01-31 | Walter Holzer | Method for monitoring the assignment of an object with respect to a particular person located near to the object, and device for carrying out the method and application of the method |
DE2837014A1 (en) * | 1978-08-24 | 1980-02-28 | Olympia Werke Ag | Device measuring distance between two movable objects - has sender and receiver coupled with objects and bar carrying ultrasonic oscillations |
Cited By (57)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2182183A (en) * | 1985-10-26 | 1987-05-07 | Robert Peter Andow | Child vicinity radio alarm system |
EP0271787A2 (en) * | 1986-12-18 | 1988-06-22 | Selectronic Funk- und Sicherheitstechnik GmbH | Personal-protection radio apparatus |
EP0271787A3 (en) * | 1986-12-18 | 1989-03-08 | Selectronic Funk- Und Sicherheitstechnik Gmbh | Personal-protection radio apparatus |
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 |
GB2224146A (en) * | 1988-10-22 | 1990-04-25 | Roy Kenneth Hammond | Intruder alarm system |
GB2217084A (en) * | 1989-03-07 | 1989-10-18 | Mark Sillett | Personal security device |
DE4012074A1 (en) * | 1990-04-14 | 1991-10-17 | Meulen Alfred V D | Raid alarm worn on finger of operator - is actuated by pressure on concealed switch instigating PCM transmission from IR emitting diode |
GB2248330A (en) * | 1990-09-14 | 1992-04-01 | David William Seeman | Child/article monitoring system |
GB2248331A (en) * | 1990-09-26 | 1992-04-01 | Harry Stuart Arfield | Surveillance alarm system |
GB2275804A (en) * | 1993-03-06 | 1994-09-07 | Manjit Singh Bains | Child alarm/monitor |
GB2279170A (en) * | 1993-05-04 | 1994-12-21 | Trevor Newton | Electronic tagging system |
DE19528818A1 (en) * | 1995-08-05 | 1997-02-06 | Cordes Hans Theodor Dr | Method of securing objects, e.g. cases, vehicles, bicycles and even living beings - involves alarm device which emits signal when object is handled in unauthorised manner; signal is received by mobile receiver associated with a person which warns the person accordingly |
GB2350714A (en) * | 1999-06-01 | 2000-12-06 | Ronald Anderson Garden | Personal items alarm |
DE10153427A1 (en) * | 2001-10-30 | 2003-05-15 | Fritz Kutschera | Device for detecting movements has a sensor to detect infrared rays and an evaluating device connected to the sensor all in a common casing |
GB2389216A (en) * | 2002-05-30 | 2003-12-03 | Kenneth Dolman | Anti-theft or anti-loss proximity alarm |
GB2389216B (en) * | 2002-05-30 | 2004-12-29 | Kenneth Dolman | Proximity system |
GB2392537A (en) * | 2002-08-27 | 2004-03-03 | William Barrington Lawes | Distance monitoring alarm |
GB2392537B (en) * | 2002-08-27 | 2007-03-28 | William Barrington Lawes | Monitoring system |
GB2398417A (en) * | 2003-02-12 | 2004-08-18 | John Williams | Personal property alarm system |
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US7669461B2 (en) | 2004-09-23 | 2010-03-02 | Lawrence Kates | System and method for utility metering and leak detection |
WO2006132745A1 (en) * | 2005-06-06 | 2006-12-14 | Lawrence Kates | System and method for variable threshold sensor |
US10425877B2 (en) | 2005-07-01 | 2019-09-24 | Google Llc | Maintaining information facilitating deterministic network routing |
US10813030B2 (en) | 2005-07-01 | 2020-10-20 | Google Llc | Maintaining information facilitating deterministic network routing |
US10664792B2 (en) | 2008-05-16 | 2020-05-26 | Google Llc | Maintaining information facilitating deterministic network routing |
US11308440B2 (en) | 2008-05-16 | 2022-04-19 | Google Llc | Maintaining information facilitating deterministic network routing |
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JPS5927392A (en) | 1984-02-13 |
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