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GB1172585A - Acoustical Alarm - Google Patents

Acoustical Alarm

Info

Publication number
GB1172585A
GB1172585A GB916667A GB916667A GB1172585A GB 1172585 A GB1172585 A GB 1172585A GB 916667 A GB916667 A GB 916667A GB 916667 A GB916667 A GB 916667A GB 1172585 A GB1172585 A GB 1172585A
Authority
GB
United Kingdom
Prior art keywords
loud
transistors
speaker
cycles per
sawtooth waveform
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
GB916667A
Other languages
English (en)
Inventor
James Robinson
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.)
General Alarm Corp
Original Assignee
General Alarm 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 General Alarm Corp filed Critical General Alarm Corp
Publication of GB1172585A publication Critical patent/GB1172585A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Amplifiers (AREA)
  • Electromechanical Clocks (AREA)
GB916667A 1966-03-01 1967-02-27 Acoustical Alarm Expired GB1172585A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US53088366A 1966-03-01 1966-03-01

Publications (1)

Publication Number Publication Date
GB1172585A true GB1172585A (en) 1969-12-03

Family

ID=24115370

Family Applications (1)

Application Number Title Priority Date Filing Date
GB916667A Expired GB1172585A (en) 1966-03-01 1967-02-27 Acoustical Alarm

Country Status (5)

Country Link
BE (1) BE694798A (de)
CH (1) CH459009A (de)
DE (1) DE1288960C2 (de)
FR (1) FR1512884A (de)
GB (1) GB1172585A (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE537420C (de) * 1930-02-07 1931-11-02 Wilhelm Dietsche Vorrichtung zur Signalgebung an Fahrzeugen
DE669797C (de) * 1934-03-10 1939-01-04 Atlas Werke Ag Luftschallsender mit regelbaren, resonanzfaehigen Gebilden
DE1014888B (de) * 1956-06-30 1957-08-29 Funke Huster Elektrizitaets Signalgeraet fuer den Bergbau

Also Published As

Publication number Publication date
FR1512884A (fr) 1968-02-09
DE1288960C2 (de) 1973-05-17
BE694798A (de) 1967-08-28
DE1288960B (de) 1969-02-06
CH459009A (de) 1968-06-30

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees