FR2018947A1 - - Google Patents

Info

Publication number
FR2018947A1
FR2018947A1 FR6932749A FR6932749A FR2018947A1 FR 2018947 A1 FR2018947 A1 FR 2018947A1 FR 6932749 A FR6932749 A FR 6932749A FR 6932749 A FR6932749 A FR 6932749A FR 2018947 A1 FR2018947 A1 FR 2018947A1
Authority
FR
France
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Withdrawn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
FR6932749A
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.)
EVERITT KENNETH
Original Assignee
EVERITT KENNETH
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 EVERITT KENNETH filed Critical EVERITT KENNETH
Publication of FR2018947A1 publication Critical patent/FR2018947A1/fr
Withdrawn legal-status Critical Current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
    • G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
    • G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means
    • G08B13/1627—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means using Doppler shift detection circuits
FR6932749A 1968-09-26 1969-09-25 Withdrawn FR2018947A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB45782/68A GB1242404A (en) 1968-09-26 1968-09-26 Improved alarm device

Publications (1)

Publication Number Publication Date
FR2018947A1 true FR2018947A1 (fr) 1970-06-26

Family

ID=10438579

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6932749A Withdrawn FR2018947A1 (fr) 1968-09-26 1969-09-25

Country Status (4)

Country Link
US (1) US3659289A (fr)
DE (1) DE1948867A1 (fr)
FR (1) FR2018947A1 (fr)
GB (1) GB1242404A (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086586A (en) * 1976-08-02 1978-04-25 Ernst Spirig Closed space integrity
US4755792A (en) * 1985-06-13 1988-07-05 Black & Decker Inc. Security control system
GB2299668A (en) * 1995-04-01 1996-10-09 David Appleby Fire sensor using ultrasonic sound
CA2752192A1 (fr) * 2009-02-11 2010-08-19 Koninklijke Philips Electronics N.V. Systeme de detection de mouvement et procede avec points nuls

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071933A (en) * 1931-02-28 1937-02-23 Rca Corp Alarm system
US2400309A (en) * 1941-10-31 1946-05-14 Baldwin Co Oscillation generator
US2655645A (en) * 1947-09-26 1953-10-13 Alertronic Corp Method and apparatus for detecting motion in a confined space
US3191124A (en) * 1961-10-30 1965-06-22 Avco Corp Amplitude noise control gate
US3287722A (en) * 1962-05-07 1966-11-22 Bryant F Craig Remote controlled switching system
US3135951A (en) * 1962-05-31 1964-06-02 Sylvania Electric Prod Secure communication line
US3388389A (en) * 1964-06-09 1968-06-11 Davis Foreman Alarm systems
US3378829A (en) * 1965-04-02 1968-04-16 Berkeley Scient Lab Fire warning device
US3513463A (en) * 1967-08-08 1970-05-19 Automatic Sprinkler Corp Sound monitor intruder alarm system

Also Published As

Publication number Publication date
DE1948867A1 (de) 1970-04-23
GB1242404A (en) 1971-08-11
US3659289A (en) 1972-04-25

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Legal Events

Date Code Title Description
ST Notification of lapse