GB1552777A - Intruder detection - Google Patents

Intruder detection

Info

Publication number
GB1552777A
GB1552777A GB1097176A GB1097176A GB1552777A GB 1552777 A GB1552777 A GB 1552777A GB 1097176 A GB1097176 A GB 1097176A GB 1097176 A GB1097176 A GB 1097176A GB 1552777 A GB1552777 A GB 1552777A
Authority
GB
United Kingdom
Prior art keywords
intruder detection
intruder
detection
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
GB1097176A
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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 BICC PLC filed Critical BICC PLC
Priority to GB1097176A priority Critical patent/GB1552777A/en
Publication of GB1552777A publication Critical patent/GB1552777A/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
    • G08B13/2497—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field using transmission lines, e.g. cable

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
GB1097176A 1977-03-17 1977-03-17 Intruder detection Expired GB1552777A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1097176A GB1552777A (en) 1977-03-17 1977-03-17 Intruder detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1097176A GB1552777A (en) 1977-03-17 1977-03-17 Intruder detection

Publications (1)

Publication Number Publication Date
GB1552777A true GB1552777A (en) 1979-09-19

Family

ID=9977685

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1097176A Expired GB1552777A (en) 1977-03-17 1977-03-17 Intruder detection

Country Status (1)

Country Link
GB (1) GB1552777A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169731A (en) * 1985-01-14 1986-07-16 Jnr Robert Mcnair Foam injection detector
RU2557467C2 (en) * 2013-10-21 2015-07-20 Евгений Юрьевич Андрианов Radio-wave method of detecting objects

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169731A (en) * 1985-01-14 1986-07-16 Jnr Robert Mcnair Foam injection detector
RU2557467C2 (en) * 2013-10-21 2015-07-20 Евгений Юрьевич Андрианов Radio-wave method of detecting objects

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Legal Events

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