GB1322279A - Proximity detectors - Google Patents

Proximity detectors

Info

Publication number
GB1322279A
GB1322279A GB2242771A GB2242771A GB1322279A GB 1322279 A GB1322279 A GB 1322279A GB 2242771 A GB2242771 A GB 2242771A GB 2242771 A GB2242771 A GB 2242771A GB 1322279 A GB1322279 A GB 1322279A
Authority
GB
United Kingdom
Prior art keywords
transistor
pulses
voltage
generator
capacitor
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
GB2242771A
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.)
Pyrotector Inc
Original Assignee
Pyrotector Inc
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 Pyrotector Inc filed Critical Pyrotector Inc
Publication of GB1322279A publication Critical patent/GB1322279A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Traffic Control Systems (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
GB2242771A 1970-03-11 1971-04-19 Proximity detectors Expired GB1322279A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1865470A 1970-03-11 1970-03-11

Publications (1)

Publication Number Publication Date
GB1322279A true GB1322279A (en) 1973-07-04

Family

ID=21789075

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2242771A Expired GB1322279A (en) 1970-03-11 1971-04-19 Proximity detectors

Country Status (6)

Country Link
JP (1) JPS5132360B1 (enExample)
DE (1) DE2111774B2 (enExample)
ES (1) ES389444A1 (enExample)
FR (1) FR2084457A5 (enExample)
GB (1) GB1322279A (enExample)
ZA (1) ZA711381B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315831A1 (de) * 1983-04-30 1984-10-31 Karl Jürgen 7505 Ettlingen Schwarz Verfahren zur ueberwachung eines abgestellten objektes und schaltungsanordnung hierzu

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48110734U (enExample) * 1972-03-24 1973-12-19

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315831A1 (de) * 1983-04-30 1984-10-31 Karl Jürgen 7505 Ettlingen Schwarz Verfahren zur ueberwachung eines abgestellten objektes und schaltungsanordnung hierzu

Also Published As

Publication number Publication date
DE2111774A1 (de) 1971-09-30
DE2111774B2 (de) 1976-12-23
FR2084457A5 (enExample) 1971-12-17
ZA711381B (en) 1971-12-29
JPS462629A (enExample) 1971-10-20
JPS5132360B1 (enExample) 1976-09-11
ES389444A1 (es) 1974-12-16

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee