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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
Authority
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
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.)
Svenska AB Gasaccumulator
Original Assignee
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.)
Filing date
Publication date
Application filed by Svenska AB Gasaccumulator filed Critical Svenska AB Gasaccumulator
Application granted granted Critical
Publication of US2921551A publication Critical patent/US2921551A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Fire Alarms (AREA)

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)

Publication Number Publication Date
US2921551A true US2921551A (en) 1960-01-19

Family

ID=8001341

Family Applications (1)

Application Number Title Priority Date Filing Date
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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