GB1520196A - Alarm and theft prevention apparatus - Google Patents

Alarm and theft prevention apparatus

Info

Publication number
GB1520196A
GB1520196A GB2204776A GB2204776A GB1520196A GB 1520196 A GB1520196 A GB 1520196A GB 2204776 A GB2204776 A GB 2204776A GB 2204776 A GB2204776 A GB 2204776A GB 1520196 A GB1520196 A GB 1520196A
Authority
GB
United Kingdom
Prior art keywords
receiver
transmitter
signal
alarm
electrical signal
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
GB2204776A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2204776A priority Critical patent/GB1520196A/en
Publication of GB1520196A publication Critical patent/GB1520196A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/023—Power management, e.g. system sleep and wake up provisions
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1427—Mechanical actuation by lifting or attempted removal of hand-portable articles with transmitter-receiver for distance detection
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0241—Data exchange details, e.g. data protocol
    • G08B21/0247—System arrangements wherein the alarm criteria uses signal strength

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

1520196 Theft alarms W HOLZER 27 May 1976 22047/76 Heading G4N An alarm and theft prevention apparatus comprises a transmitter I which transmits a pulsed and modulated signal (radio, light or ultrasonic) and a receiver II which is kept in tune with the transmitted pulsed and modulated signal, wherein the receiver checks the presence of the transmitted signal, demodulates the resultant electrical signal and passes the demodulated electrical signal to a threshold detector 8 which causes energization of a signal device if the amplitude of the demodulated electrical signal falls below a reference level. The transmitter is preferably accommodated on an article to be guarded and the receiver is carried by the guard or messenger. Alternatively the receiver is on the article with the transmitter on the guard. A plurality of articles may be monitored either using a single transmitter and a plurality of receivers or vice versa.
GB2204776A 1976-05-27 1976-05-27 Alarm and theft prevention apparatus Expired GB1520196A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2204776A GB1520196A (en) 1976-05-27 1976-05-27 Alarm and theft prevention apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2204776A GB1520196A (en) 1976-05-27 1976-05-27 Alarm and theft prevention apparatus

Publications (1)

Publication Number Publication Date
GB1520196A true GB1520196A (en) 1978-08-02

Family

ID=10173019

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2204776A Expired GB1520196A (en) 1976-05-27 1976-05-27 Alarm and theft prevention apparatus

Country Status (1)

Country Link
GB (1) GB1520196A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073681A2 (en) * 1981-09-02 1983-03-09 Kunwar Chander Jeet Singh Improvements relating to position detection devices
GB2132804A (en) * 1982-11-01 1984-07-11 Kropf Lawrence Kenneth Francis Portable security alarm
GB2182183A (en) * 1985-10-26 1987-05-07 Robert Peter Andow Child vicinity radio alarm system
GB2214340A (en) * 1988-01-08 1989-08-31 Jeffrey Kear Lost or stolen property warning device
GB2217084A (en) * 1989-03-07 1989-10-18 Mark Sillett Personal security device
GB2218553A (en) * 1988-05-13 1989-11-15 Philip Malcolm Grange Dick Security system
GB2236000A (en) * 1989-09-01 1991-03-20 Ronald George Connor Theft or loss alarm system
GB2248330A (en) * 1990-09-14 1992-04-01 David William Seeman Child/article monitoring system
GB2398417A (en) * 2003-02-12 2004-08-18 John Williams Personal property alarm system
CN102289919A (en) * 2011-05-09 2011-12-21 李英才 Monitoring and local location system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073681A2 (en) * 1981-09-02 1983-03-09 Kunwar Chander Jeet Singh Improvements relating to position detection devices
EP0073681A3 (en) * 1981-09-02 1983-10-12 Kunwar Chander Jeet Singh Improvements relating to position detection devices
GB2132804A (en) * 1982-11-01 1984-07-11 Kropf Lawrence Kenneth Francis Portable security alarm
GB2182183A (en) * 1985-10-26 1987-05-07 Robert Peter Andow Child vicinity radio alarm system
GB2214340A (en) * 1988-01-08 1989-08-31 Jeffrey Kear Lost or stolen property warning device
GB2218553A (en) * 1988-05-13 1989-11-15 Philip Malcolm Grange Dick Security system
GB2217084A (en) * 1989-03-07 1989-10-18 Mark Sillett Personal security device
GB2236000A (en) * 1989-09-01 1991-03-20 Ronald George Connor Theft or loss alarm system
GB2248330A (en) * 1990-09-14 1992-04-01 David William Seeman Child/article monitoring system
GB2398417A (en) * 2003-02-12 2004-08-18 John Williams Personal property alarm system
CN102289919A (en) * 2011-05-09 2011-12-21 李英才 Monitoring and local location system

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee