DE3380326D1 - Method and apparatus for theft detection systems - Google Patents

Method and apparatus for theft detection systems

Info

Publication number
DE3380326D1
DE3380326D1 DE8383901292T DE3380326T DE3380326D1 DE 3380326 D1 DE3380326 D1 DE 3380326D1 DE 8383901292 T DE8383901292 T DE 8383901292T DE 3380326 T DE3380326 T DE 3380326T DE 3380326 D1 DE3380326 D1 DE 3380326D1
Authority
DE
Germany
Prior art keywords
detection systems
theft detection
theft
systems
detection
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
DE8383901292T
Other languages
German (de)
Inventor
Larry Eccleston
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.)
Progressive Dynamics Inc
Original Assignee
Progressive Dynamics Inc
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
Priority claimed from US06/358,383 external-priority patent/US4524350A/en
Priority claimed from US06/358,299 external-priority patent/US4535323A/en
Application filed by Progressive Dynamics Inc filed Critical Progressive Dynamics Inc
Application granted granted Critical
Publication of DE3380326D1 publication Critical patent/DE3380326D1/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
    • G08B13/2405—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 characterised by the tag technology used
    • G08B13/2408—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 characterised by the tag technology used using ferromagnetic tags

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
DE8383901292T 1982-03-15 1983-03-10 Method and apparatus for theft detection systems Expired DE3380326D1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US06/358,383 US4524350A (en) 1982-03-15 1982-03-15 Detection logic and signal processing method and apparatus for theft detection systems
US06/358,299 US4535323A (en) 1982-03-15 1982-03-15 Preamplifying and signal processing method and apparatus for theft detection systems
US36426482A 1982-04-01 1982-04-01
PCT/US1983/000316 WO1983003203A1 (en) 1982-03-15 1983-03-10 Method and apparatus for theft detection systems

Publications (1)

Publication Number Publication Date
DE3380326D1 true DE3380326D1 (en) 1989-09-07

Family

ID=27408345

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8383901292T Expired DE3380326D1 (en) 1982-03-15 1983-03-10 Method and apparatus for theft detection systems

Country Status (5)

Country Link
EP (1) EP0103629B1 (en)
AU (1) AU562133B2 (en)
CA (1) CA1217256A (en)
DE (1) DE3380326D1 (en)
WO (1) WO1983003203A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4668942A (en) * 1984-11-19 1987-05-26 Progressive Dynamics, Inc. Signal analysis apparatus including recursive filter for electromagnetic surveillance system
US4888579A (en) * 1988-09-16 1989-12-19 Minnesota Mining And Manufacturing Company False alarm minimization and direction determination methods
US5748086A (en) * 1995-11-14 1998-05-05 Sensormatic Electronics Corporation Electronic article surveillance system with comb filtering and false alarm suppression
GB9915595D0 (en) * 1999-07-02 1999-09-01 Sadler Robin W Identification apparatus for reading moving tags in passageways
NZ566979A (en) 2005-09-20 2011-01-28 Allflex Australia Pty Ltd Animal portal with coil wound around and horizontal radiator elements to each side

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR763681A (en) * 1933-11-10 1934-05-04 Method of locating objects by modifying a magnetic field
US3747086A (en) * 1968-03-22 1973-07-17 Shoplifter International Inc Deactivatable ferromagnetic marker for detection of objects having marker secured thereto and method and system of using same
US3665449A (en) * 1969-07-11 1972-05-23 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
US3740742A (en) * 1971-05-11 1973-06-19 T Thompson Method and apparatus for actuating an electric circuit
US3838409A (en) * 1973-04-13 1974-09-24 Knogo Corp Field strength uniformity control system for article theft detection system
US3983552A (en) * 1975-01-14 1976-09-28 American District Telegraph Company Pilferage detection systems
US4168496A (en) * 1977-10-05 1979-09-18 Lichtblau G J Quasi-stationary noise cancellation system
US4300183A (en) * 1980-03-27 1981-11-10 Richardson Robert H Method and apparatus for generating alternating magnetic fields to produce harmonic signals from a metallic strip
US4321586A (en) * 1980-08-21 1982-03-23 Knogo Corporation Article theft detection
US4309697A (en) * 1980-10-02 1982-01-05 Sensormatic Electronics Corporation Magnetic surveillance system with odd-even harmonic and phase discrimination

Also Published As

Publication number Publication date
AU1471983A (en) 1983-10-24
CA1217256A (en) 1987-01-27
EP0103629B1 (en) 1989-08-02
EP0103629A4 (en) 1987-03-12
WO1983003203A1 (en) 1983-09-29
AU562133B2 (en) 1987-05-28
EP0103629A1 (en) 1984-03-28

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee