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GB2157042B - Detecting intruders - Google Patents

Detecting intruders

Info

Publication number
GB2157042B
GB2157042B GB08408937A GB8408937A GB2157042B GB 2157042 B GB2157042 B GB 2157042B GB 08408937 A GB08408937 A GB 08408937A GB 8408937 A GB8408937 A GB 8408937A GB 2157042 B GB2157042 B GB 2157042B
Authority
GB
United Kingdom
Prior art keywords
detecting intruders
intruders
detecting
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
GB08408937A
Other versions
GB2157042A (en
Inventor
Harold Cowell Holden
June Holden
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.)
MICROPROTECTOR Ltd
Original Assignee
MICROPROTECTOR Ltd
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 MICROPROTECTOR Ltd filed Critical MICROPROTECTOR Ltd
Priority to GB08408937A priority Critical patent/GB2157042B/en
Priority claimed from EP85307367A external-priority patent/EP0218765B1/en
Priority to US06/787,404 priority patent/US4692743A/en
Publication of GB2157042A publication Critical patent/GB2157042A/en
Application granted granted Critical
Publication of GB2157042B publication Critical patent/GB2157042B/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
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/20—Actuation by change of fluid pressure

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Burglar Alarm Systems (AREA)
GB08408937A 1984-04-06 1984-04-06 Detecting intruders Expired GB2157042B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08408937A GB2157042B (en) 1984-04-06 1984-04-06 Detecting intruders
US06/787,404 US4692743A (en) 1984-04-06 1985-10-15 Alarm system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08408937A GB2157042B (en) 1984-04-06 1984-04-06 Detecting intruders
EP85307367A EP0218765B1 (en) 1985-10-14 1985-10-14 Detection and alarm system

Publications (2)

Publication Number Publication Date
GB2157042A GB2157042A (en) 1985-10-16
GB2157042B true GB2157042B (en) 1987-09-09

Family

ID=26099377

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08408937A Expired GB2157042B (en) 1984-04-06 1984-04-06 Detecting intruders

Country Status (1)

Country Link
GB (1) GB2157042B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4692743A (en) * 1984-04-06 1987-09-08 Holden Harold C Alarm system
FR2596179A1 (en) * 1986-03-18 1987-09-25 Smcm Intruder detection system, applicable especially to an alarm system
GB2247317B (en) * 1990-08-13 1994-05-04 Danby Medical Ltd A device for monitoring pressure in a fluid flow system
DE19943618C1 (en) * 1999-09-11 2001-05-31 Bayerische Motoren Werke Ag Capacitive intrusion sensor and sensor system with such a sensor
GB2447050B (en) * 2007-03-01 2012-02-08 Thales Holdings Uk Plc A Security device

Also Published As

Publication number Publication date
GB2157042A (en) 1985-10-16

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Legal Events

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

Effective date: 19940406