US2921551A - Acoustic alarm device - Google Patents

Acoustic alarm device Download PDF

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Publication number
US2921551A
US2921551A US613644A US61364456A US2921551A US 2921551 A US2921551 A US 2921551A US 613644 A US613644 A US 613644A US 61364456 A US61364456 A US 61364456A US 2921551 A US2921551 A US 2921551A
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US
United States
Prior art keywords
alarm device
acoustic alarm
acoustic
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 - Lifetime
Application number
US613644A
Inventor
Hagger Albert
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Svenska AB Gasaccumulator
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Svenska AB Gasaccumulator
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.)
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Publication date
Application filed by Svenska AB Gasaccumulator filed Critical Svenska AB Gasaccumulator
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Publication of US2921551A publication Critical patent/US2921551A/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K5/00—Whistles

Description

US613644A 1955-10-13 1956-10-03 Acoustic alarm device Expired - Lifetime US2921551A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2921551X 1955-10-13

Publications (1)

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US2921551A true US2921551A (en) 1960-01-19

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US613644A Expired - Lifetime US2921551A (en) 1955-10-13 1956-10-03 Acoustic alarm device

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091213A (en) * 1959-01-22 1963-05-28 Normalair Ltd Fluid pressure operated warning device
US3285222A (en) * 1964-05-19 1966-11-15 Plessis Jacques Artur Du Gas pressure warning valve
US3776174A (en) * 1971-03-12 1973-12-04 K Kunoth Gas pressure operated warning devices
US3811400A (en) * 1971-07-20 1974-05-21 Globe Safety Prod Inc Fluid operated alarm system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US960246A (en) * 1909-06-17 1910-06-07 Frank F Ashmore Automatic-alarm tire-valve.
US1236411A (en) * 1917-01-26 1917-08-14 Willard F Downs Tire valve and signal.
US1298538A (en) * 1918-01-31 1919-03-25 Otto F Meyer Tire-alarm.
US1502039A (en) * 1923-05-21 1924-07-22 Knutson William Tire alarm
US1758840A (en) * 1929-12-21 1930-05-13 Kreill Therese Rescue whistle
US2709983A (en) * 1954-03-22 1955-06-07 James F Divietro Alarm mechanism for automobile tires

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US960246A (en) * 1909-06-17 1910-06-07 Frank F Ashmore Automatic-alarm tire-valve.
US1236411A (en) * 1917-01-26 1917-08-14 Willard F Downs Tire valve and signal.
US1298538A (en) * 1918-01-31 1919-03-25 Otto F Meyer Tire-alarm.
US1502039A (en) * 1923-05-21 1924-07-22 Knutson William Tire alarm
US1758840A (en) * 1929-12-21 1930-05-13 Kreill Therese Rescue whistle
US2709983A (en) * 1954-03-22 1955-06-07 James F Divietro Alarm mechanism for automobile tires

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091213A (en) * 1959-01-22 1963-05-28 Normalair Ltd Fluid pressure operated warning device
US3285222A (en) * 1964-05-19 1966-11-15 Plessis Jacques Artur Du Gas pressure warning valve
US3776174A (en) * 1971-03-12 1973-12-04 K Kunoth Gas pressure operated warning devices
US3811400A (en) * 1971-07-20 1974-05-21 Globe Safety Prod Inc Fluid operated alarm system

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