GB9200113D0 - Intruder alarms - Google Patents

Intruder alarms

Info

Publication number
GB9200113D0
GB9200113D0 GB929200113A GB9200113A GB9200113D0 GB 9200113 D0 GB9200113 D0 GB 9200113D0 GB 929200113 A GB929200113 A GB 929200113A GB 9200113 A GB9200113 A GB 9200113A GB 9200113 D0 GB9200113 D0 GB 9200113D0
Authority
GB
United Kingdom
Prior art keywords
intruder alarms
intruder
alarms
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.)
Withdrawn
Application number
GB929200113A
Other versions
GB2263771A (en
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.)
RFR ELECTRONICS Ltd
SOUND INTERNATIONAL Ltd
Original Assignee
RFR ELECTRONICS Ltd
SOUND INTERNATIONAL 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 RFR ELECTRONICS Ltd, SOUND INTERNATIONAL Ltd filed Critical RFR ELECTRONICS Ltd
Priority to GB9200113A priority Critical patent/GB2263771A/en
Publication of GB9200113D0 publication Critical patent/GB9200113D0/en
Publication of GB2263771A publication Critical patent/GB2263771A/en
Withdrawn legal-status Critical Current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
    • G08B13/20—Actuation by change of fluid pressure
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Burglar Alarm Systems (AREA)
GB9200113A 1992-01-04 1992-01-04 Intruder alarms Withdrawn GB2263771A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9200113A GB2263771A (en) 1992-01-04 1992-01-04 Intruder alarms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9200113A GB2263771A (en) 1992-01-04 1992-01-04 Intruder alarms

Publications (2)

Publication Number Publication Date
GB9200113D0 true GB9200113D0 (en) 1992-02-26
GB2263771A GB2263771A (en) 1993-08-04

Family

ID=10708114

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9200113A Withdrawn GB2263771A (en) 1992-01-04 1992-01-04 Intruder alarms

Country Status (1)

Country Link
GB (1) GB2263771A (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4928085A (en) * 1983-02-23 1990-05-22 Bluegrass Electronics, Inc. Pressure change intrusion detector
FR2622719A1 (en) * 1987-10-30 1989-05-05 Philippe Francois DIFFERENTIAL DETECTOR OF ACOUSTIC PRESSURE
US4991145A (en) * 1988-08-03 1991-02-05 Rabbit Systems, Inc. Infra-sonic detector and alarm with self adjusting reference
US4920332A (en) * 1988-10-31 1990-04-24 Francois Philippe Differential detector of acoustic pressure
GB2231660A (en) * 1989-03-02 1990-11-21 David Mainprize Detecting entry into an enclosed space from air pressure changes

Also Published As

Publication number Publication date
GB2263771A (en) 1993-08-04

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)