US3961597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefied gas alarm device
Assignee: Gillette Co LLC
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Filing: 1974-06-27
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Granted: 1976-06-08
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Expires: 1994-06-27
Abstract
Abstract In a temperature-sensitive alarm device incorporating a horn driven by a propellant which is stored in the liquid state in a pressure vessel, full utilization of the propellant for sounding the horn is obtained by incorporating into the pressure vessel a heat reservoir, such as a sealed bag of water, in order to release heat for maintaining rapid vaporization of the propellant.
Inventors
- 👤 William W. Lester
- 👤 Lawrence V. Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06; G01K1/00; G01K1/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
107 words
An alarm device comprising a pressure vessel, valve means at the outlet of said pressure vessel, gas-pressure-powered signal means, conduit means connecting said signal means through said valve means to said pressure vessel, a liquefied propellant gas in said pressure vessel for operating said signal means, means responsive to an external condition to open said valve means, whereby said signal means is caused to emit a signal, and a sealed plastic bag containing water as a heat reservoir in said pressure vessel to release heat during vaporization of said liquefied propellant gas, whereby to maintain rapid vaporization of said liquefied propellant gas for operating said signal means.
Claim 2
Dependent Claim
107 words
An alarm device comprising a pressure vessel, valve means at the outlet of said pressure vessel, gas-pressure-powered signal means, conduit means connecting said signal means through said valve means to said pressure vessel, a liquefied propellant gas in said pressure vessel for operating said signal means, means responsive to an external condition to open said valve means, whereby said signal means is caused to emit a signal, and a sealed plastic bag containing water as a heat reservoir in said pressure vessel to release heat during vaporization of said liquefied propellant gas, whereby to maintain rapid vaporization of said liquefied propellant gas for operating said signal means.
Claim 3
Dependent Claim
17 words
An alarm device as defined in claim 1, in which said liquefied propellant gas is a chlorofluorohydrocarbon.
References Cited (Backward Citations)
US365399A
Cited
US2121673A
Cited
US2248073A
Cited
US2815152A
Cited
US2993466A
Cited
US3235137A
Cited
US3244137A
Cited
US3536028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |