GB1233063A - - Google Patents

Info

Publication number
GB1233063A
GB1233063A GB1233063DA GB1233063A GB 1233063 A GB1233063 A GB 1233063A GB 1233063D A GB1233063D A GB 1233063DA GB 1233063 A GB1233063 A GB 1233063A
Authority
GB
United Kingdom
Prior art keywords
alarm
converter
intruder
receiver
circuits
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
Other languages
English (en)
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 filed Critical
Publication of GB1233063A publication Critical patent/GB1233063A/en
Expired legal-status Critical Current

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
    • G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
GB1233063D 1968-08-06 1968-08-06 Expired GB1233063A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3751768 1968-08-06

Publications (1)

Publication Number Publication Date
GB1233063A true GB1233063A (enrdf_load_stackoverflow) 1971-05-26

Family

ID=10397073

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1233063D Expired GB1233063A (enrdf_load_stackoverflow) 1968-08-06 1968-08-06

Country Status (1)

Country Link
GB (1) GB1233063A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571578A (en) * 1983-04-19 1986-02-18 The United States Of America As Represented By The Secretary Of The Air Force Intrusion barrier and detection apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571578A (en) * 1983-04-19 1986-02-18 The United States Of America As Represented By The Secretary Of The Air Force Intrusion barrier and detection apparatus

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees