GB8904827D0 - Air pressure intruder detector - Google Patents

Air pressure intruder detector

Info

Publication number
GB8904827D0
GB8904827D0 GB8904827A GB8904827A GB8904827D0 GB 8904827 D0 GB8904827 D0 GB 8904827D0 GB 8904827 A GB8904827 A GB 8904827A GB 8904827 A GB8904827 A GB 8904827A GB 8904827 D0 GB8904827 D0 GB 8904827D0
Authority
GB
United Kingdom
Prior art keywords
air pressure
intruder detector
intruder
detector
air
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Withdrawn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
GB8904827A
Other versions
GB2231660A (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8904827A priority Critical patent/GB2231660A/en
Publication of GB8904827D0 publication Critical patent/GB8904827D0/en
Publication of GB2231660A publication Critical patent/GB2231660A/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Withdrawn legal-status Critical Current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
GB8904827A 1989-03-02 1989-03-02 Detecting entry into an enclosed space from air pressure changes Withdrawn GB2231660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8904827A GB2231660A (en) 1989-03-02 1989-03-02 Detecting entry into an enclosed space from air pressure changes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8904827A GB2231660A (en) 1989-03-02 1989-03-02 Detecting entry into an enclosed space from air pressure changes

Publications (2)

Publication Number Publication Date
GB8904827D0 true GB8904827D0 (en) 1989-04-12
GB2231660A GB2231660A (en) 1990-11-21

Family

ID=10652628

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8904827A Withdrawn GB2231660A (en) 1989-03-02 1989-03-02 Detecting entry into an enclosed space from air pressure changes

Country Status (1)

Country Link
GB (1) GB2231660A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2263771A (en) * 1992-01-04 1993-08-04 Sound International Ltd Intruder alarms
FR2785428B1 (en) * 1998-11-04 2001-08-31 Daniel Caubet ANTI-INTRUSION DETECTION METHOD AND DEVICE
CN107853883A (en) * 2017-11-28 2018-03-30 聊城市孩室宝家俱有限公司 A kind of learning chair intelligent posture correction band

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990069A (en) * 1973-05-14 1976-11-02 Mark Schuman System for monitoring changes in the fluidic impedance or volume of an enclosure
FR2523339A1 (en) * 1982-03-12 1983-09-16 Guglielmetti Vg Electro INFRA-SOUND VOLUMETRIC SENSOR DETECTION DEVICE AND INFRA-SOUND DETECTION METHOD
FR2560701B1 (en) * 1984-03-05 1987-04-17 Sogesec Sarl DIFFERENTIAL PRESSURE ACCESS DETECTOR
DE3412914A1 (en) * 1984-04-05 1985-10-31 base electronic gmbH, 2000 Hamburg METHOD AND DEVICE FOR SECURING CLOSED SPACES
US4692743A (en) * 1984-04-06 1987-09-08 Holden Harold C Alarm system
US4853677A (en) * 1988-07-20 1989-08-01 Yarbrough Alfred E Portable intrusion alarm

Also Published As

Publication number Publication date
GB2231660A (en) 1990-11-21

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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)