GB1186673A - Improvements in or relating to Systems for Detecting the Presence of Objects in a Monitored Area - Google Patents

Improvements in or relating to Systems for Detecting the Presence of Objects in a Monitored Area

Info

Publication number
GB1186673A
GB1186673A GB1784666A GB1784666A GB1186673A GB 1186673 A GB1186673 A GB 1186673A GB 1784666 A GB1784666 A GB 1784666A GB 1784666 A GB1784666 A GB 1784666A GB 1186673 A GB1186673 A GB 1186673A
Authority
GB
United Kingdom
Prior art keywords
systems
relating
objects
detecting
monitored area
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
GB1784666A
Inventor
Walter Edward Armstead
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.)
AUDAC AUDIO ASSOCIATES Ltd
Original Assignee
AUDAC AUDIO ASSOCIATES 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 AUDAC AUDIO ASSOCIATES Ltd filed Critical AUDAC AUDIO ASSOCIATES Ltd
Priority to GB1784666A priority Critical patent/GB1186673A/en
Publication of GB1186673A publication Critical patent/GB1186673A/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

Abstract

1,186,673. Intruder alarm systems. AUDAC (AUDIO ASSOCIATES) Ltd. 14 April, 1967 [22 April, 1966], No. 17846/66. Heading G4N. An intruder alarm comprises :a frequencymodulated transmitter and a superheterodyne receiver arranged to produce a visible and/or audible alarm signal when a moving body changes the standing wave pattern in the protected area.
GB1784666A 1966-04-22 1966-04-22 Improvements in or relating to Systems for Detecting the Presence of Objects in a Monitored Area Expired GB1186673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1784666A GB1186673A (en) 1966-04-22 1966-04-22 Improvements in or relating to Systems for Detecting the Presence of Objects in a Monitored Area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1784666A GB1186673A (en) 1966-04-22 1966-04-22 Improvements in or relating to Systems for Detecting the Presence of Objects in a Monitored Area

Publications (1)

Publication Number Publication Date
GB1186673A true GB1186673A (en) 1970-04-02

Family

ID=10102252

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1784666A Expired GB1186673A (en) 1966-04-22 1966-04-22 Improvements in or relating to Systems for Detecting the Presence of Objects in a Monitored Area

Country Status (1)

Country Link
GB (1) GB1186673A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645307A1 (en) * 1989-04-04 1990-10-05 Boudes Jacques Electronic device for selective detection of persons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645307A1 (en) * 1989-04-04 1990-10-05 Boudes Jacques Electronic device for selective detection of persons

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed