NO912997D0 - Merkebrikke med frekvensdeler. - Google Patents

Merkebrikke med frekvensdeler.

Info

Publication number
NO912997D0
NO912997D0 NO912997A NO912997A NO912997D0 NO 912997 D0 NO912997 D0 NO 912997D0 NO 912997 A NO912997 A NO 912997A NO 912997 A NO912997 A NO 912997A NO 912997 D0 NO912997 D0 NO 912997D0
Authority
NO
Norway
Prior art keywords
circuit
frequency
resonant
electromagnetic radiation
response
Prior art date
Application number
NO912997A
Other languages
English (en)
Other versions
NO912997L (no
Inventor
Fred Wade Herman
Ming Ren Lian
Original Assignee
Security Tag Systems 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 US07/562,471 external-priority patent/US5065138A/en
Priority claimed from US07/562,475 external-priority patent/US5065137A/en
Application filed by Security Tag Systems Inc filed Critical Security Tag Systems Inc
Publication of NO912997D0 publication Critical patent/NO912997D0/no
Publication of NO912997L publication Critical patent/NO912997L/no

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
    • G08B13/2414—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 inductive tags
    • G08B13/242—Tag deactivation
    • 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
    • G08B13/2405—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
    • G08B13/2425—Tag deactivation
    • 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
    • G08B13/2428—Tag details
    • G08B13/2431—Tag circuit details
    • 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material details

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Filters And Equalizers (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
  • General Induction Heating (AREA)
  • Near-Field Transmission Systems (AREA)
  • Electronic Switches (AREA)
  • Magnetic Treatment Devices (AREA)
NO91912997A 1990-08-03 1991-08-01 Merkebrikke med frekvensdeler. NO912997L (no)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/562,471 US5065138A (en) 1990-08-03 1990-08-03 Magnetically-coupled two-resonant-circuit, frequency divider for presence-detection-system tag
US07/562,475 US5065137A (en) 1990-08-03 1990-08-03 Magnetically-coupled, two-resonant-circuit, frequency-division tag

Publications (2)

Publication Number Publication Date
NO912997D0 true NO912997D0 (no) 1991-08-01
NO912997L NO912997L (no) 1992-02-04

Family

ID=27072966

Family Applications (1)

Application Number Title Priority Date Filing Date
NO91912997A NO912997L (no) 1990-08-03 1991-08-01 Merkebrikke med frekvensdeler.

Country Status (8)

Country Link
EP (1) EP0469769B1 (no)
JP (1) JP3224564B2 (no)
AT (1) ATE152848T1 (no)
AU (1) AU635654B2 (no)
CA (1) CA2047559C (no)
DE (1) DE69125985T2 (no)
ES (1) ES2100934T3 (no)
NO (1) NO912997L (no)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5241298A (en) * 1992-03-18 1993-08-31 Security Tag Systems, Inc. Electrically-and-magnetically-coupled, batteryless, portable, frequency divider
SE508322C2 (sv) * 1994-02-07 1998-09-28 Leif Aasbrink Larmelement
GB9815118D0 (en) * 1998-07-14 1998-09-09 Clan Holdings Ltd Security tag
US7199717B2 (en) * 2004-02-17 2007-04-03 Sensormatic Electronics Corporation Frequency-division marker for an electronic article surveillance system
US10380857B1 (en) * 2018-03-05 2019-08-13 Sensormatic Electronics, LLC Systems and methods for radio frequency identification enabled deactivation of acousto-magnetic ferrite based marker

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1604219A (en) * 1977-04-28 1981-12-02 Parmeko Ltd Detection systems
US4481428A (en) * 1981-05-19 1984-11-06 Security Tag Systems, Inc. Batteryless, portable, frequency divider useful as a transponder of electromagnetic radiation
NL8204802A (nl) * 1982-12-10 1984-07-02 Nedap Nv Detectieplaatje met niet-lineair circuit voor een detectiestelsel.
US4727360A (en) * 1985-09-13 1988-02-23 Security Tag Systems, Inc. Frequency-dividing transponder and use thereof in a presence detection system
US4670740A (en) * 1985-11-04 1987-06-02 Security Tag Systems, Inc. Portable, batteryless, frequency divider consisting of inductor and diode

Also Published As

Publication number Publication date
AU8132591A (en) 1992-02-06
EP0469769B1 (en) 1997-05-07
EP0469769A2 (en) 1992-02-05
NO912997L (no) 1992-02-04
DE69125985D1 (de) 1997-06-12
AU635654B2 (en) 1993-03-25
ATE152848T1 (de) 1997-05-15
JPH04233696A (ja) 1992-08-21
CA2047559C (en) 1999-07-06
ES2100934T3 (es) 1997-07-01
EP0469769A3 (en) 1992-12-30
CA2047559A1 (en) 1992-02-04
JP3224564B2 (ja) 2001-10-29
DE69125985T2 (de) 1997-12-11

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