GB8423298D0 - Intruder alarm systems - Google Patents

Intruder alarm systems

Info

Publication number
GB8423298D0
GB8423298D0 GB8423298A GB8423298A GB8423298D0 GB 8423298 D0 GB8423298 D0 GB 8423298D0 GB 8423298 A GB8423298 A GB 8423298A GB 8423298 A GB8423298 A GB 8423298A GB 8423298 D0 GB8423298 D0 GB 8423298D0
Authority
GB
United Kingdom
Prior art keywords
alarm systems
intruder alarm
intruder
systems
alarm
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Withdrawn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
GB8423298A
Other versions
GB2147441A (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.)
Tough F J
Original Assignee
Tough F J
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 Tough F J filed Critical Tough F J
Publication of GB8423298D0 publication Critical patent/GB8423298D0/en
Publication of GB2147441A publication Critical patent/GB2147441A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/941—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated using an optical detector
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
GB8423298A 1983-09-16 1984-09-14 Intruder alarm systems Withdrawn GB2147441A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8324851 1983-09-16

Publications (2)

Publication Number Publication Date
GB8423298D0 true GB8423298D0 (en) 1984-10-17
GB2147441A GB2147441A (en) 1985-05-09

Family

ID=10548884

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8423298A Withdrawn GB2147441A (en) 1983-09-16 1984-09-14 Intruder alarm systems

Country Status (1)

Country Link
GB (1) GB2147441A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6409986A (en) * 1985-10-07 1987-04-24 Sigalov, H. Light beam control signals for musical instruments

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1212094A (en) * 1968-07-02 1970-11-11 Shorrock Dev Pulse modulated beam intruder detector
GB1404913A (en) * 1973-01-09 1975-09-03 Byrne R C Protable security system
US3825745A (en) * 1973-05-21 1974-07-23 Electronics Corp America Object detecting system
GB1598052A (en) * 1978-01-26 1981-09-16 Byrne R C Method and apparatus for detecting the entry of an intruder into a secure area
US4249074A (en) * 1978-06-06 1981-02-03 Xenex Corporation Intrusion detector for press brake
GB2108743B (en) * 1981-11-09 1986-09-10 Hughes Technology Pty Ltd Laser security system

Also Published As

Publication number Publication date
GB2147441A (en) 1985-05-09

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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)