Patent US3154773A successfully refreshed from Google Patents.
US3154773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire alarm with an aerosol indicator for detecting combustion products suspended in the air
Assignee: Cerberus AG
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Filing: 1961-02-23
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Granted: 1964-10-27
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Expires: 1981-02-23
Abstract
No abstract record available.
Inventors
- 👤 Meili Ernst
- 👤 Lampart Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:38
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113; G01; G01N; G01N27/00; G01N27/62; G01N27/64; G01N27/66; G08B17/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
THE COMBINATION WITH A FIRE ALARM, FOR DETECTING THE PRESENCE OF PRODUCTS OF COMBUSTION CONTAINED IN A FLUID MEDIUM, OF THE TYPE COMPRISING CIRCUIT MEANS FOR OPERATING SAID FIRE ALARM, HOUSING MEANS HAVING AN INLET OPENING AND INTERNALLY PROVIDED WITH AN IONIZATON CHAMBER COMMUNICATING WITH SAID INLET OPENING AND INCLUDING SPACED ELECTRODE MEANS AND RADIOACTIVE MATERIAL PROVIDED IN SAID IONIZATION CHAMBER FOR AT LEAST PARTIALLY IONIZING THE SPACE THEREBETWEEN, FILTER MEANS OPERATIVELY ASSOCIATED WITH SAID INLET OPENING OF SAID HOUSING FOR PREVENTING PARTICLES ENTERING SAID IONIZATION CHAMBER WHICH SUBSTANTIALLY RESULT FROM OTHER THAN A COMBUSTION PROCESS, SAID FILTER MEANS BEING CONSTRUCTED TO PASS PARTICLES HAVING A DIAMETER SMALLER THAN 1 MICRON WHILE RETAINING THE MAJORITY OF PARTICLES HAVING A DIAMETER GREATER THAN 5 MICRONS.
Claim 2
Dependent Claim
124 words
THE COMBINATION WITH A FIRE ALARM, FOR DETECTING THE PRESENCE OF PRODUCTS OF COMBUSTION CONTAINED IN A FLUID MEDIUM, OF THE TYPE COMPRISING CIRCUIT MEANS FOR OPERATING SAID FIRE ALARM, HOUSING MEANS HAVING AN INLET OPENING AND INTERNALLY PROVIDED WITH AN IONIZATON CHAMBER COMMUNICATING WITH SAID INLET OPENING AND INCLUDING SPACED ELECTRODE MEANS AND RADIOACTIVE MATERIAL PROVIDED IN SAID IONIZATION CHAMBER FOR AT LEAST PARTIALLY IONIZING THE SPACE THEREBETWEEN, FILTER MEANS OPERATIVELY ASSOCIATED WITH SAID INLET OPENING OF SAID HOUSING FOR PREVENTING PARTICLES ENTERING SAID IONIZATION CHAMBER WHICH SUBSTANTIALLY RESULT FROM OTHER THAN A COMBUSTION PROCESS, SAID FILTER MEANS BEING CONSTRUCTED TO PASS PARTICLES HAVING A DIAMETER SMALLER THAN 1 MICRON WHILE RETAINING THE MAJORITY OF PARTICLES HAVING A DIAMETER GREATER THAN 5 MICRONS.
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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |