ZA816937B - Dual frequency anti-theft system - Google Patents

Dual frequency anti-theft system

Info

Publication number
ZA816937B
ZA816937B ZA816937A ZA816937A ZA816937B ZA 816937 B ZA816937 B ZA 816937B ZA 816937 A ZA816937 A ZA 816937A ZA 816937 A ZA816937 A ZA 816937A ZA 816937 B ZA816937 B ZA 816937B
Authority
ZA
South Africa
Prior art keywords
theft system
dual frequency
frequency anti
dual
theft
Prior art date
Application number
ZA816937A
Inventor
H Williams
Original Assignee
Deterrent Tech 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 Deterrent Tech Corp filed Critical Deterrent Tech Corp
Publication of ZA816937B publication Critical patent/ZA816937B/en

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
    • G08B13/2422—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 acoustic or microwave tags
    • 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

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Burglar Alarm Systems (AREA)
ZA816937A 1980-10-09 1981-10-07 Dual frequency anti-theft system ZA816937B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19557280A 1980-10-09 1980-10-09

Publications (1)

Publication Number Publication Date
ZA816937B true ZA816937B (en) 1982-11-24

Family

ID=22721923

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA816937A ZA816937B (en) 1980-10-09 1981-10-07 Dual frequency anti-theft system

Country Status (12)

Country Link
EP (1) EP0062056A4 (en)
JP (1) JPH0353678B2 (en)
AU (1) AU552568B2 (en)
BR (1) BR8108829A (en)
CA (1) CA1190970A (en)
DK (1) DK161172C (en)
ES (1) ES8207351A1 (en)
FI (1) FI73532C (en)
IT (1) IT1142881B (en)
NZ (1) NZ198497A (en)
WO (1) WO1982001437A1 (en)
ZA (1) ZA816937B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0091581B1 (en) * 1982-04-12 1988-05-18 Ici Americas Inc. Crossed beam high frequency anti-theft system
CA1236542A (en) * 1983-08-02 1988-05-10 Harold B. Williams Electronic article surveillance system having microstrip antennas
US5349332A (en) * 1992-10-13 1994-09-20 Sensormatic Electronics Corportion EAS system with requency hopping
US5347280A (en) * 1993-07-02 1994-09-13 Texas Instruments Deutschland Gmbh Frequency diversity transponder arrangement
US5831530A (en) * 1994-12-30 1998-11-03 Lace Effect, Llc Anti-theft vehicle system
US5798693A (en) 1995-06-07 1998-08-25 Engellenner; Thomas J. Electronic locating systems
US8358209B2 (en) * 2005-06-03 2013-01-22 Sensomatic Electronics, LLC Techniques for detecting RFID tags in electronic article surveillance systems using frequency mixing

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO126975B (en) * 1967-03-30 1973-04-16 John Welsh
US3631484A (en) * 1969-07-30 1971-12-28 Microlab Fxr Harmonic detection system
US3707711A (en) * 1970-04-02 1972-12-26 Peter Harold Cole Electronic surveillance system
US3895368A (en) * 1972-08-09 1975-07-15 Sensormatic Electronics Corp Surveillance system and method utilizing both electrostatic and electromagnetic fields
GB1586069A (en) * 1976-11-15 1981-03-18 Nedap Nv Detection systems
NL7804417A (en) * 1977-04-28 1978-10-31 Parmeko Ltd DETECTION SYSTEM FOR MONITORING THE POSITION OF AN ARTICLE IN A CONTROL ZONE.
US4139844A (en) * 1977-10-07 1979-02-13 Sensormatic Electronics Corporation Surveillance method and system with electromagnetic carrier and plural range limiting signals
ZA7994B (en) * 1978-01-11 1980-01-30 Tag Radionics Ltd Presence sensing system
US4249167A (en) * 1979-06-05 1981-02-03 Magnavox Government And Industrial Electronics Company Apparatus and method for theft detection system having different frequencies

Also Published As

Publication number Publication date
IT1142881B (en) 1986-10-15
FI73532B (en) 1987-06-30
ES506117A0 (en) 1982-09-01
FI73532C (en) 1987-10-09
NZ198497A (en) 1985-08-30
ES8207351A1 (en) 1982-09-01
FI821956A0 (en) 1982-06-02
WO1982001437A1 (en) 1982-04-29
AU7721981A (en) 1982-05-11
EP0062056A1 (en) 1982-10-13
AU552568B2 (en) 1986-06-05
JPS57501550A (en) 1982-08-26
DK161172C (en) 1991-11-25
JPH0353678B2 (en) 1991-08-15
EP0062056A4 (en) 1985-06-06
DK161172B (en) 1991-06-03
DK258082A (en) 1982-06-09
BR8108829A (en) 1982-08-24
CA1190970A (en) 1985-07-23
IT8149451A0 (en) 1981-10-08

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