GB1185265A - An Apparatus for Detecting Crossing of a Boundary by a Subject - Google Patents

An Apparatus for Detecting Crossing of a Boundary by a Subject

Info

Publication number
GB1185265A
GB1185265A GB22306/68A GB2230668A GB1185265A GB 1185265 A GB1185265 A GB 1185265A GB 22306/68 A GB22306/68 A GB 22306/68A GB 2230668 A GB2230668 A GB 2230668A GB 1185265 A GB1185265 A GB 1185265A
Authority
GB
United Kingdom
Prior art keywords
transistor
intruder
tubes
signal
output
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
GB22306/68A
Other languages
English (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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1185265A publication Critical patent/GB1185265A/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
    • G08B13/20—Actuation by change of fluid pressure

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
GB22306/68A 1967-08-24 1968-05-10 An Apparatus for Detecting Crossing of a Boundary by a Subject Expired GB1185265A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US66301367A 1967-08-24 1967-08-24

Publications (1)

Publication Number Publication Date
GB1185265A true GB1185265A (en) 1970-03-25

Family

ID=24660152

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22306/68A Expired GB1185265A (en) 1967-08-24 1968-05-10 An Apparatus for Detecting Crossing of a Boundary by a Subject

Country Status (4)

Country Link
BE (1) BE714066A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1576035A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1185265A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IL (1) IL29843A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3753260A (en) * 1971-10-04 1973-08-14 Westinghouse Electric Corp Pulse reflection test means for balanced pressure surveillance detector
NL7208873A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1972-06-28 1974-01-02

Also Published As

Publication number Publication date
BE714066A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1968-09-16
IL29843A (en) 1971-07-28
DE1766574B2 (de) 1976-01-29
IL29843A0 (en) 1970-01-29
FR1576035A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-07-25
DE1766574A1 (de) 1971-02-11

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee