GB1537748A - Intruder alarm systems - Google Patents

Intruder alarm systems

Info

Publication number
GB1537748A
GB1537748A GB3557176A GB3557176A GB1537748A GB 1537748 A GB1537748 A GB 1537748A GB 3557176 A GB3557176 A GB 3557176A GB 3557176 A GB3557176 A GB 3557176A GB 1537748 A GB1537748 A GB 1537748A
Authority
GB
United Kingdom
Prior art keywords
alarm systems
intruder alarm
intruder
systems
alarm
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
GB3557176A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3557176A priority Critical patent/GB1537748A/en
Publication of GB1537748A publication Critical patent/GB1537748A/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)
GB3557176A 1977-08-16 1977-08-16 Intruder alarm systems Expired GB1537748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3557176A GB1537748A (en) 1977-08-16 1977-08-16 Intruder alarm systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3557176A GB1537748A (en) 1977-08-16 1977-08-16 Intruder alarm systems

Publications (1)

Publication Number Publication Date
GB1537748A true GB1537748A (en) 1979-01-04

Family

ID=10379212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3557176A Expired GB1537748A (en) 1977-08-16 1977-08-16 Intruder alarm systems

Country Status (1)

Country Link
GB (1) GB1537748A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990015998A1 (en) * 1989-06-15 1990-12-27 Cambridge Consultants Limited Object detection and analysis with transmission lines
US5457990A (en) * 1991-12-03 1995-10-17 Cambridge Consultants Limited Method and apparatus for determining a fluid level in the vicinity of a transmission line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990015998A1 (en) * 1989-06-15 1990-12-27 Cambridge Consultants Limited Object detection and analysis with transmission lines
US5457990A (en) * 1991-12-03 1995-10-17 Cambridge Consultants Limited Method and apparatus for determining a fluid level in the vicinity of a transmission line

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Legal Events

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