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
Other languages
English (en)
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)
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 (enExample)
AU (1) AU433043B2 (enExample)
BE (1) BE775869A (enExample)
CA (1) CA954202A (enExample)
DE (1) DE2159606A1 (enExample)
FR (1) FR2116511B1 (enExample)
GB (1) GB1329194A (enExample)
IT (1) IT946253B (enExample)
ZA (1) ZA717336B (enExample)

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 (nl) * 1973-04-13 Knogo Corp Diefstal-detectiestelsel.
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 (nl) * 1977-04-28 1978-10-31 Parmeko Ltd Detectiestelsel voor het bewaken van de positie van een artikel in een controlezone.
DE2732543C3 (de) * 1977-07-19 1980-08-07 Precitec Gesellschaft Fuer Praezisionstechnik Und Elektronik Mbh & Co Entwicklungs- Und Vertriebs-Kg, 7570 Baden-Baden Vorrichtung zur Erfassung von sich im Gebiet einer Grenzfläche befindenden Objekten
NL7708012A (nl) * 1977-07-19 1979-01-23 Nedap Nv Detectiestelsel.
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 (de) * 1984-04-23 1999-10-25 Lichtblau G J Deaktivierbarer resonanzschaltkreis
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
EP0892969A4 (en) * 1996-04-10 2000-12-06 Sentry Technology Corp ELECTRONIC GOODS MONITORING 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
CN112424844B (zh) 2018-05-17 2023-05-09 关卡系统股份有限公司 双硬标签

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

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Legal Events

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