US3353170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ionization fire alarm system
Assignee: Cerberus AG
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Filing: 1963-11-12
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Granted: 1967-11-14
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Meili Ernst
- 👤 Lampart Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:31
CPC Classifications
G; G01; G01T; G01T7/00; G01T7/12; G01T7/125; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A FIRE ALARM OF THE IONIZATION TYPE RESPONSIVE TO CHANGES IN THE COMPOSITION OF A GAS COMPRISING AT LEAST ONE IONIZATION CHAMBER OPEN TO THE GAS TO BE TESTED, MEANS FOR IONIZING THE GASES IN SAID IONIZATION CHAMBER, THE IMPROVEMENT WHICH COMPRISES SAID IONIZING MEANS INCORPORATING A RADIATION SOURCE WHICH COOPERATES WITH SAID IONIZATION CHAMBER FOR INDUCING UNDER NORMAL ATMOSPHERIC CONDITIONS A GAS IONIZATION RATE OF NOT MORE THAN ONE ION PAIR PER CUBIC MILLIMETER PER SECOND AT A DISTANCE OF 10 CENTIMETERS FROM THE EXTERNAL LIMITS OF SAID IONIZATION CHAMBER, SAID RADIATION SOURCE BEING A SUBSTANCE WHICH IS POOR IN GAMMA RADIATION AND PRODUCING AT LEAST 108 TIMES MORE ION PAIRS PER CUBIC MILLIMETER AT A DISTANCE OF 0.5 CENTIMETER FROM SAID RADIATION SOURCE THAN AT A DISTANCE OF 10 CENTIMETERS, TO THEREBY DECREASE THE EFFECTS OF DUST UPON THE FIRE ALARM.
Claim 2
Dependent Claim
144 words
IN A FIRE ALARM OF THE IONIZATION TYPE RESPONSIVE TO CHANGES IN THE COMPOSITION OF A GAS COMPRISING AT LEAST ONE IONIZATION CHAMBER OPEN TO THE GAS TO BE TESTED, MEANS FOR IONIZING THE GASES IN SAID IONIZATION CHAMBER, THE IMPROVEMENT WHICH COMPRISES SAID IONIZING MEANS INCORPORATING A RADIATION SOURCE WHICH COOPERATES WITH SAID IONIZATION CHAMBER FOR INDUCING UNDER NORMAL ATMOSPHERIC CONDITIONS A GAS IONIZATION RATE OF NOT MORE THAN ONE ION PAIR PER CUBIC MILLIMETER PER SECOND AT A DISTANCE OF 10 CENTIMETERS FROM THE EXTERNAL LIMITS OF SAID IONIZATION CHAMBER, SAID RADIATION SOURCE BEING A SUBSTANCE WHICH IS POOR IN GAMMA RADIATION AND PRODUCING AT LEAST 108 TIMES MORE ION PAIRS PER CUBIC MILLIMETER AT A DISTANCE OF 0.5 CENTIMETER FROM SAID RADIATION SOURCE THAN AT A DISTANCE OF 10 CENTIMETERS, TO THEREBY DECREASE THE EFFECTS OF DUST UPON THE FIRE ALARM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |