FI821956A0 - DOUBLE FREQUENCY TJUVALARMSYSTEM - Google Patents

DOUBLE FREQUENCY TJUVALARMSYSTEM

Info

Publication number
FI821956A0
FI821956A0 FI821956A FI821956A FI821956A0 FI 821956 A0 FI821956 A0 FI 821956A0 FI 821956 A FI821956 A FI 821956A FI 821956 A FI821956 A FI 821956A FI 821956 A0 FI821956 A0 FI 821956A0
Authority
FI
Finland
Prior art keywords
tjuvalarmsystem
double frequency
double
frequency
frequency tjuvalarmsystem
Prior art date
Application number
FI821956A
Other languages
Finnish (fi)
Other versions
FI73532C (en
FI73532B (en
Inventor
Harold 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 FI821956A0 publication Critical patent/FI821956A0/en
Application granted granted Critical
Publication of FI73532B publication Critical patent/FI73532B/en
Publication of FI73532C publication Critical patent/FI73532C/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)
FI821956A 1980-10-09 1982-06-02 Double frequency anti-theft system. FI73532C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US19557280A 1980-10-09 1980-10-09
US19557280 1980-10-09
US8101335 1981-10-01
PCT/US1981/001335 WO1982001437A1 (en) 1980-10-09 1981-10-01 Dual frequency anti-theft system

Publications (3)

Publication Number Publication Date
FI821956A0 true FI821956A0 (en) 1982-06-02
FI73532B FI73532B (en) 1987-06-30
FI73532C FI73532C (en) 1987-10-09

Family

ID=22721923

Family Applications (1)

Application Number Title Priority Date Filing Date
FI821956A FI73532C (en) 1980-10-09 1982-06-02 Double 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) ES506117A0 (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
DK161172C (en) 1991-11-25
IT8149451A0 (en) 1981-10-08
FI73532C (en) 1987-10-09
JPS57501550A (en) 1982-08-26
CA1190970A (en) 1985-07-23
AU7721981A (en) 1982-05-11
DK161172B (en) 1991-06-03
AU552568B2 (en) 1986-06-05
WO1982001437A1 (en) 1982-04-29
EP0062056A4 (en) 1985-06-06
EP0062056A1 (en) 1982-10-13
ZA816937B (en) 1982-11-24
JPH0353678B2 (en) 1991-08-15
IT1142881B (en) 1986-10-15
ES8207351A1 (en) 1982-09-01
NZ198497A (en) 1985-08-30
FI73532B (en) 1987-06-30
BR8108829A (en) 1982-08-24
DK258082A (en) 1982-06-09
ES506117A0 (en) 1982-09-01

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Legal Events

Date Code Title Description
MM Patent lapsed

Owner name: DETERRENT TECHNOLOGY CORPORATION