FR698774A - Alarm device - Google Patents

Alarm device

Info

Publication number
FR698774A
FR698774A FR698774DA FR698774A FR 698774 A FR698774 A FR 698774A FR 698774D A FR698774D A FR 698774DA FR 698774 A FR698774 A FR 698774A
Authority
FR
France
Prior art keywords
alarm device
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.)
Expired
Application number
Other languages
French (fr)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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
Priority claimed from GB2847229A external-priority patent/GB337904A/en
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of FR698774A publication Critical patent/FR698774A/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
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
FR698774D 1929-07-27 1930-07-09 Alarm device Expired FR698774A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2038878X 1929-07-27
GB2847229A GB337904A (en) 1929-09-19 1929-09-19 Improvements in or relating to alarm devices

Publications (1)

Publication Number Publication Date
FR698774A true FR698774A (en) 1931-02-05

Family

ID=32510439

Family Applications (1)

Application Number Title Priority Date Filing Date
FR698774D Expired FR698774A (en) 1929-07-27 1930-07-09 Alarm device

Country Status (2)

Country Link
US (1) US2038878A (en)
FR (1) FR698774A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645307A1 (en) * 1989-04-04 1990-10-05 Boudes Jacques Electronic device for selective detection of persons

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649538A (en) * 1949-10-13 1953-08-18 Westinghouse Air Brake Co Space intrusion detection system
US2656527A (en) * 1950-07-24 1953-10-20 John E Tillman Signal deviation warning system
US3065455A (en) * 1958-10-07 1962-11-20 Wilfred Roth Detection apparatus
US3163861A (en) * 1962-05-02 1964-12-29 Suter Henry Electromagnetic field disturbance intruder detection apparatus
US3300768A (en) * 1963-08-20 1967-01-24 Boeing Co Radiant energy type intrusion alarm system
US3314066A (en) * 1965-06-02 1967-04-11 Devenco Inc Method and apparatus for detecting the entrance of an object into a region being monitored
US4633236A (en) * 1985-06-21 1986-12-30 Buhl Automatic, V/Holger Buhl Mailbox
US5117457A (en) * 1986-11-05 1992-05-26 International Business Machines Corp. Tamper resistant packaging for information protection in electronic circuitry
AU2001292686A1 (en) * 2000-09-14 2002-03-26 Time Domain Corporation System and method for detecting an intruder using impulse radio technology
US7804441B1 (en) * 2007-07-13 2010-09-28 The United States Of America As Represented By The Secretary Of The Navy Detection of concealed object by standing waves
JP5310870B2 (en) * 2010-09-30 2013-10-09 トヨタ自動車株式会社 Moving object detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645307A1 (en) * 1989-04-04 1990-10-05 Boudes Jacques Electronic device for selective detection of persons

Also Published As

Publication number Publication date
US2038878A (en) 1936-04-28

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