DE3380326D1 - Method and apparatus for theft detection systems - Google Patents
Method and apparatus for theft detection systemsInfo
- 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
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)
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)
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)
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 |
-
1983
- 1983-03-10 DE DE8383901292T patent/DE3380326D1/en not_active Expired
- 1983-03-10 AU AU14719/83A patent/AU562133B2/en not_active Ceased
- 1983-03-10 EP EP83901292A patent/EP0103629B1/en not_active Expired
- 1983-03-10 WO PCT/US1983/000316 patent/WO1983003203A1/en active IP Right Grant
- 1983-03-14 CA CA000423477A patent/CA1217256A/en not_active Expired
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 |