GB1329194A - Apparatus for article theft detection - Google Patents

Apparatus for article theft detection

Info

Publication number
GB1329194A
GB1329194A GB5111371A GB5111371A GB1329194A GB 1329194 A GB1329194 A GB 1329194A GB 5111371 A GB5111371 A GB 5111371A GB 5111371 A GB5111371 A GB 5111371A GB 1329194 A GB1329194 A GB 1329194A
Authority
GB
United Kingdom
Prior art keywords
antenna
exit
pulse
duplicate
alarm
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.)
Expired
Application number
GB5111371A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knogo Corp
Original Assignee
Knogo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Knogo Corp filed Critical Knogo Corp
Publication of GB1329194A publication Critical patent/GB1329194A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2488—Timing issues, e.g. synchronising measures to avoid signal collision, with multiple emitters or a single emitter and receiver
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

1329194 Inductive signalling KNOGO CORP 3 Nov 1971 [2 Dec 1970] 51113/71 Heading H4U [Also in Division G4] Theft of articles is indicated at 20 by the effect of a timed circuit attached to each article upon a signal supplied to an antenna 10 near an exit from the protected area, and erroneous operation is inhibited at 28 by a duplicate system 2 having another antenna 21. The signal generator 11 energizing both antennae has its frequency swept by 13, 14, 12 and a drop in signal amplitude at 16 due to presence of a timed circuit near the antenna 10 is detected as a pulse at 18 to operate a relay 19 and alarm 20 which may be audio, visual, or an automatic door locking arrangement. Spurious signals which may energize the pulse detecting system 15-18 of the main antenna 10 also energize the duplicate pulse detecting system 2 (22-25) controlled by the second antenna, and operate a relay 27 to disable the alarm 20. The antenna 21 is placed far enough from 10 however not to be affected by a stolen article. The same oscillator 11 as shown or a separate one may be used to energize the duplicate system. A refinement of this arrangement (Fig. 3, not shown) has both main and second antennae 10, 21 arranged to detect a stolen article at one exit, and both antennae 10, 21 of a second similar pair of detecting systems (39, 43) arranged to detect a stolen article at a second adjacent exit, but with the duplicate detecting systems 42 (43) arranged to disable the alarms of the non-associated main detectors (39) 36. This prevents the system at one exit responding to a stolen article at the other. In a differently arranged embodiment (Fig. 2, not shown) the main antenna and associated pulse detector (3) is associated with one exit and an identical arrangement (4) constituting the duplicate system with an adjacent exit. The pulse amplitudes produced (at 18) are compared in discriminators (34, 35) which enable appropriate gates (19) so that the antenna whose detector produces the largest pulse is allowed to operate its alarm. This again prevents stolen articles in one exit operating the alarm in an adjacent exit.
GB5111371A 1970-12-02 1971-11-03 Apparatus for article theft detection Expired GB1329194A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9444170A 1970-12-02 1970-12-02

Publications (1)

Publication Number Publication Date
GB1329194A true GB1329194A (en) 1973-09-05

Family

ID=22245221

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5111371A Expired GB1329194A (en) 1970-12-02 1971-11-03 Apparatus for article theft detection

Country Status (9)

Country Link
US (1) US3696379A (en)
AU (1) AU433043B2 (en)
BE (1) BE775869A (en)
CA (1) CA954202A (en)
DE (1) DE2159606A1 (en)
FR (1) FR2116511B1 (en)
GB (1) GB1329194A (en)
IT (1) IT946253B (en)
ZA (1) ZA717336B (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919704A (en) * 1972-12-04 1975-11-11 Check Mate Systems Inc System and method for detecting unauthorized removal of goods from protected premises, and magnet detecting apparatus suitable for use therein
NL161904C (en) * 1973-04-13 Knogo Corp THEFT DETECTION SYSTEM.
US3828337A (en) * 1973-08-20 1974-08-06 G Lichtblau Noise rejection circuitry
US4063230A (en) * 1975-06-12 1977-12-13 The Magnavox Company Balanced field theft detection system
US4117466A (en) * 1977-03-14 1978-09-26 Lichtblau G J Beat frequency interference rejection circuit
NL7804417A (en) * 1977-04-28 1978-10-31 Parmeko Ltd DETECTION SYSTEM FOR MONITORING THE POSITION OF AN ARTICLE IN A CONTROL ZONE.
NL7708012A (en) * 1977-07-19 1979-01-23 Nedap Nv DETECTION SYSTEM.
DE2732543C3 (en) * 1977-07-19 1980-08-07 Precitec Gesellschaft Fuer Praezisionstechnik Und Elektronik Mbh & Co Entwicklungs- Und Vertriebs-Kg, 7570 Baden-Baden Device for detecting objects located in the area of an interface
US4135184A (en) * 1977-08-31 1979-01-16 Knogo Corporation Electronic theft detection system for monitoring wide passageways
US4168496A (en) * 1977-10-05 1979-09-18 Lichtblau G J Quasi-stationary noise cancellation system
US4321586A (en) * 1980-08-21 1982-03-23 Knogo Corporation Article theft detection
US4484182A (en) * 1981-07-01 1984-11-20 Shorrock Developments Limited Intruder detection apparatus for functioning free of disturbance while in close proximity to high-power pulse-moldulated radars
AT405697B (en) * 1984-04-23 1999-10-25 Lichtblau G J Deactivatable resonant circuit
AU586692B2 (en) * 1985-07-09 1989-07-20 S.P.C. Limited Packaging process
US5047750A (en) * 1990-03-09 1991-09-10 Hector Larry F Non-intrusive infant security system
US5373301A (en) * 1993-01-04 1994-12-13 Checkpoint Systems, Inc. Transmit and receive antenna having angled crossover elements
US5602556A (en) * 1995-06-07 1997-02-11 Check Point Systems, Inc. Transmit and receive loop antenna
WO1997038404A1 (en) * 1996-04-10 1997-10-16 Sentry Technology Corporation Electronic article surveillance system
US5990791A (en) * 1997-10-22 1999-11-23 William B. Spargur Anti-theft detection system
US6147420A (en) * 1997-12-16 2000-11-14 Lear Automotive Dearborn, Inc. Wireless switching system
US7183917B2 (en) * 2003-05-19 2007-02-27 Checkpoint Systems, Inc. EAS/RFID identification hard tags
US7380711B2 (en) * 2004-07-23 2008-06-03 Checkpoint Systems, Inc. Self-check system and method for protecting digital media
EP1760625A1 (en) * 2005-08-29 2007-03-07 Datamars SA RFID system and a method for improving the detection efficiency of the RFID system
GB201116932D0 (en) * 2011-10-01 2011-11-16 Young Peter J Device to detect unattended open door or draw
US11527138B2 (en) 2018-05-17 2022-12-13 Checkpoint Systems, Inc. Dual hard tag

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693525A (en) * 1951-01-17 1954-11-02 Gen Railway Signal Co Inductive control system
US2774060A (en) * 1953-06-15 1956-12-11 Richard B Thompson Detecting means for stolen goods
US3299424A (en) * 1965-05-07 1967-01-17 Jorgen P Vinding Interrogator-responder identification system
US3500373A (en) * 1966-05-06 1970-03-10 Nat Bank Of North America The Method and apparatus for article theft detection

Also Published As

Publication number Publication date
AU3533971A (en) 1973-03-15
ZA717336B (en) 1972-07-26
BE775869A (en) 1972-03-16
FR2116511A1 (en) 1972-07-13
FR2116511B1 (en) 1975-02-21
DE2159606A1 (en) 1972-06-15
IT946253B (en) 1973-05-21
AU433043B2 (en) 1973-03-15
CA954202A (en) 1974-09-03
US3696379A (en) 1972-10-03

Similar Documents

Publication Publication Date Title
GB1329194A (en) Apparatus for article theft detection
ES454749A1 (en) Electronic security system
CA1145015A (en) Surveillance systems
US3889250A (en) Active frequency-responsive glass breakage detector
ZA742089B (en) Reduction of false alarms in electronic theft detection systems
GB1342552A (en) Intruder detection systems
ES8406766A1 (en) Infrared detector for spotting an intruder in an area.
GB1423418A (en) Method and installation for the detection of a source generating electromagnetic oscillations
GB1446259A (en) Electronic theft detection system having uniform field strength
GB1392767A (en) Ultrasonic alarm circuit
GB1448336A (en) Intrusion detection system
US5047995A (en) Detection of moving objects
US3111657A (en) Compensation for turbulence and other effects in intruder detection systems
GB1452499A (en) Electromagnetic intrustion detection system
GB1126996A (en) Signal discriminating
FR2392451A1 (en) DETECTION SYSTEMS TO LOOK FOR THE POSITION OF AN ARTICLE IN A CONTROL ZONE
US4117466A (en) Beat frequency interference rejection circuit
GB1390913A (en) Monitoring systems
AU469822B2 (en) Rate analysis system with overrange signal detection circuit for identifying false signals
GB1520196A (en) Alarm and theft prevention apparatus
GB1308702A (en) Intrusion detection apparatus having supervisory control means
GB1378295A (en) Metal detecting apparatus
GB1430091A (en) Apparatus for detecting smoke and like suspensions
GB1336255A (en) Micro-wave intruder detector systems
GB1167837A (en) Integrity Monitor for ILS Navigation Receiver.

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees