GB8905654D0 - Infra-sonic detectors for use in alarm systems - Google Patents

Infra-sonic detectors for use in alarm systems

Info

Publication number
GB8905654D0
GB8905654D0 GB898905654A GB8905654A GB8905654D0 GB 8905654 D0 GB8905654 D0 GB 8905654D0 GB 898905654 A GB898905654 A GB 898905654A GB 8905654 A GB8905654 A GB 8905654A GB 8905654 D0 GB8905654 D0 GB 8905654D0
Authority
GB
United Kingdom
Prior art keywords
infra
alarm systems
sonic detectors
sonic
detectors
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Withdrawn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
GB898905654A
Other versions
GB2234068A (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.)
MISTRY CHAND
Original Assignee
MISTRY CHAND
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 MISTRY CHAND filed Critical MISTRY CHAND
Priority to GB8905654A priority Critical patent/GB2234068A/en
Publication of GB8905654D0 publication Critical patent/GB8905654D0/en
Publication of GB2234068A publication Critical patent/GB2234068A/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Withdrawn legal-status Critical Current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
    • G08B13/16—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
GB8905654A 1989-03-13 1989-03-13 Infra-sonic detectors for use in alarm systems Withdrawn GB2234068A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8905654A GB2234068A (en) 1989-03-13 1989-03-13 Infra-sonic detectors for use in alarm systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8905654A GB2234068A (en) 1989-03-13 1989-03-13 Infra-sonic detectors for use in alarm systems

Publications (2)

Publication Number Publication Date
GB8905654D0 true GB8905654D0 (en) 1989-04-26
GB2234068A GB2234068A (en) 1991-01-23

Family

ID=10653199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8905654A Withdrawn GB2234068A (en) 1989-03-13 1989-03-13 Infra-sonic detectors for use in alarm systems

Country Status (1)

Country Link
GB (1) GB2234068A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2770670A1 (en) * 1997-11-03 1999-05-07 Omega Conception Et Systeme Sound detector alarm

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3611184C1 (en) * 1986-04-03 1987-09-03 Hirschmann Radiotechnik Method and device for securing space

Also Published As

Publication number Publication date
GB2234068A (en) 1991-01-23

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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)